mirror of https://github.com/libAthena/athena.git
Jack Andersen
4 years ago
parent
9bbd7af9f6
commit
727f057fa7
@ -1 +1 @@ |
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Subproject commit f7da328248f3fea1a5e05d3f39598850383b1867 |
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Subproject commit 55892696bb35f640f9f22c465c216f221ac5c8ad |
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@ -1,981 +0,0 @@ |
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// Copyright (C) 2011 - 2012 Andrzej Krzemienski.
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//
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// Use, modification, and distribution is subject to the Boost Software
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// The idea and interface is based on Boost.Optional library
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// authored by Fernando Luis Cacciola Carballal
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#ifndef ___OPTIONAL_HPP___ |
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#define ___OPTIONAL_HPP___ |
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#include <utility> |
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#include <type_traits> |
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#include <initializer_list> |
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#include <cassert> |
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#include <functional> |
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#include <string> |
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#include "athena/Global.hpp" |
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#define TR2_OPTIONAL_REQUIRES(...) typename enable_if<__VA_ARGS__::value, bool>::type = false |
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#if defined __GNUC__ // NOTE: GNUC is also defined for Clang
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#if (__GNUC__ == 4) && (__GNUC_MINOR__ >= 8) |
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#define TR2_OPTIONAL_GCC_4_8_AND_HIGHER___ |
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#elif (__GNUC__ > 4) |
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#define TR2_OPTIONAL_GCC_4_8_AND_HIGHER___ |
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#endif |
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# |
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#if (__GNUC__ == 4) && (__GNUC_MINOR__ >= 7) |
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#define TR2_OPTIONAL_GCC_4_7_AND_HIGHER___ |
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#elif (__GNUC__ > 4) |
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#define TR2_OPTIONAL_GCC_4_7_AND_HIGHER___ |
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#endif |
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# |
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#if (__GNUC__ == 4) && (__GNUC_MINOR__ == 8) && (__GNUC_PATCHLEVEL__ >= 1) |
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#define TR2_OPTIONAL_GCC_4_8_1_AND_HIGHER___ |
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#elif (__GNUC__ == 4) && (__GNUC_MINOR__ >= 9) |
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#define TR2_OPTIONAL_GCC_4_8_1_AND_HIGHER___ |
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#elif (__GNUC__ > 4) |
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#define TR2_OPTIONAL_GCC_4_8_1_AND_HIGHER___ |
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#endif |
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#endif |
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# |
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#if defined __clang_major__ |
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#if (__clang_major__ == 3 && __clang_minor__ >= 5) |
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#define TR2_OPTIONAL_CLANG_3_5_AND_HIGHTER_ |
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#elif (__clang_major__ > 3) |
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#define TR2_OPTIONAL_CLANG_3_5_AND_HIGHTER_ |
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#endif |
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#if defined TR2_OPTIONAL_CLANG_3_5_AND_HIGHTER_ |
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#define TR2_OPTIONAL_CLANG_3_4_2_AND_HIGHER_ |
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#elif (__clang_major__ == 3 && __clang_minor__ == 4 && __clang_patchlevel__ >= 2) |
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#define TR2_OPTIONAL_CLANG_3_4_2_AND_HIGHER_ |
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#endif |
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#endif |
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# |
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#if defined _MSC_VER |
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#if (_MSC_VER >= 1900) |
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#define TR2_OPTIONAL_MSVC_2015_AND_HIGHER___ |
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#endif |
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#endif |
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#if defined __clang__ |
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#if (__clang_major__ > 2) || (__clang_major__ == 2) && (__clang_minor__ >= 9) |
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#define OPTIONAL_HAS_THIS_RVALUE_REFS 1 |
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#else |
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#define OPTIONAL_HAS_THIS_RVALUE_REFS 0 |
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#endif |
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#elif defined TR2_OPTIONAL_GCC_4_8_1_AND_HIGHER___ |
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#define OPTIONAL_HAS_THIS_RVALUE_REFS 1 |
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#elif defined TR2_OPTIONAL_MSVC_2015_AND_HIGHER___ |
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#define OPTIONAL_HAS_THIS_RVALUE_REFS 1 |
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#else |
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#define OPTIONAL_HAS_THIS_RVALUE_REFS 0 |
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#endif |
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#if defined TR2_OPTIONAL_GCC_4_8_1_AND_HIGHER___ |
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#define OPTIONAL_HAS_CONSTEXPR_INIT_LIST 1 |
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#define OPTIONAL_CONSTEXPR_INIT_LIST constexpr |
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#else |
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#define OPTIONAL_HAS_CONSTEXPR_INIT_LIST 0 |
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#define OPTIONAL_CONSTEXPR_INIT_LIST |
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#endif |
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#if defined TR2_OPTIONAL_CLANG_3_5_AND_HIGHTER_ && (defined __cplusplus) && (__cplusplus != 201103L) |
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#define OPTIONAL_HAS_MOVE_ACCESSORS 1 |
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#else |
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#define OPTIONAL_HAS_MOVE_ACCESSORS 0 |
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#endif |
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#// In C++11 constexpr implies const, so we need to make non-const members also non-constexpr
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#if (defined __cplusplus) && (__cplusplus == 201103L) |
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#define OPTIONAL_MUTABLE_CONSTEXPR |
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#else |
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#define OPTIONAL_MUTABLE_CONSTEXPR constexpr |
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#endif |
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namespace std { |
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namespace experimental { |
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// BEGIN workaround for missing is_trivially_destructible
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#if defined TR2_OPTIONAL_GCC_4_8_AND_HIGHER___ |
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// leave it: it is already there
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#elif defined TR2_OPTIONAL_CLANG_3_4_2_AND_HIGHER_ |
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// leave it: it is already there
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#elif defined TR2_OPTIONAL_MSVC_2015_AND_HIGHER___ |
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// leave it: it is already there
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#elif defined TR2_OPTIONAL_DISABLE_EMULATION_OF_TYPE_TRAITS |
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// leave it: the user doesn't want it
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#else |
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template <typename T> |
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using is_trivially_destructible = std::has_trivial_destructor<T>; |
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#endif |
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// END workaround for missing is_trivially_destructible
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#if (defined TR2_OPTIONAL_GCC_4_7_AND_HIGHER___) |
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// leave it; our metafunctions are already defined.
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#elif defined TR2_OPTIONAL_CLANG_3_4_2_AND_HIGHER_ |
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// leave it; our metafunctions are already defined.
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#elif defined TR2_OPTIONAL_MSVC_2015_AND_HIGHER___ |
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// leave it: it is already there
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#elif defined TR2_OPTIONAL_DISABLE_EMULATION_OF_TYPE_TRAITS |
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// leave it: the user doesn't want it
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#else |
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// workaround for missing traits in GCC and CLANG
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template <class T> |
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struct is_nothrow_move_constructible { |
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constexpr static bool value = std::is_nothrow_constructible<T, T&&>::value; |
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}; |
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template <class T, class U> |
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struct is_assignable { |
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template <class X, class Y> |
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constexpr static bool has_assign(...) { |
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return false; |
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} |
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template <class X, class Y, size_t S = sizeof((std::declval<X>() = std::declval<Y>(), true))> |
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// the comma operator is necessary for the cases where operator= returns void
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constexpr static bool has_assign(bool) { |
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return true; |
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} |
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constexpr static bool value = has_assign<T, U>(true); |
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}; |
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template <class T> |
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struct is_nothrow_move_assignable { |
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template <class X, bool has_any_move_assign> |
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struct has_nothrow_move_assign { |
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constexpr static bool value = false; |
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}; |
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template <class X> |
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struct has_nothrow_move_assign<X, true> { |
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constexpr static bool value = noexcept(std::declval<X&>() = std::declval<X&&>()); |
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}; |
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constexpr static bool value = has_nothrow_move_assign<T, is_assignable<T&, T&&>::value>::value; |
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}; |
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// end workaround
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#endif |
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// 20.5.4, optional for object types
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template <class T> |
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class optional; |
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// 20.5.5, optional for lvalue reference types
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template <class T> |
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class optional<T&>; |
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// workaround: std utility functions aren't constexpr yet
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template <class T> |
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inline constexpr T&& constexpr_forward(typename std::remove_reference<T>::type& t) noexcept { |
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return static_cast<T&&>(t); |
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} |
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template <class T> |
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inline constexpr T&& constexpr_forward(typename std::remove_reference<T>::type&& t) noexcept { |
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static_assert(!std::is_lvalue_reference<T>::value, "!!"); |
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return static_cast<T&&>(t); |
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} |
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template <class T> |
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inline constexpr typename std::remove_reference<T>::type&& constexpr_move(T&& t) noexcept { |
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return static_cast<typename std::remove_reference<T>::type&&>(t); |
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} |
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#if defined NDEBUG |
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#define TR2_OPTIONAL_ASSERTED_EXPRESSION(CHECK, EXPR) (EXPR) |
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#else |
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#define TR2_OPTIONAL_ASSERTED_EXPRESSION(CHECK, EXPR) ((CHECK) ? (EXPR) : ([] { assert(!#CHECK); }(), (EXPR))) |
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#endif |
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namespace detail_ { |
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// static_addressof: a constexpr version of addressof
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template <typename T> |
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struct has_overloaded_addressof { |
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template <class X> |
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constexpr static bool has_overload(...) { |
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return false; |
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} |
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template <class X, size_t S = sizeof(std::declval<X&>().operator&())> |
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constexpr static bool has_overload(bool) { |
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return true; |
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} |
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constexpr static bool value = has_overload<T>(true); |
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}; |
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template <typename T, TR2_OPTIONAL_REQUIRES(!has_overloaded_addressof<T>)> |
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constexpr T* static_addressof(T& ref) { |
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return &ref; |
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} |
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template <typename T, TR2_OPTIONAL_REQUIRES(has_overloaded_addressof<T>)> |
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T* static_addressof(T& ref) { |
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return std::addressof(ref); |
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} |
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// the call to convert<A>(b) has return type A and converts b to type A iff b decltype(b) is implicitly convertible to A
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template <class U> |
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U convert(U v) { |
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return v; |
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} |
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} // namespace detail_
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constexpr struct trivial_init_t { |
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} trivial_init{}; |
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// 20.5.6, In-place construction
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constexpr struct in_place_t { |
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} in_place{}; |
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// 20.5.7, Disengaged state indicator
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struct nullopt_t { |
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struct init {}; |
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constexpr explicit nullopt_t(init) {} |
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}; |
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constexpr nullopt_t nullopt{nullopt_t::init()}; |
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// 20.5.8, class bad_optional_access
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class bad_optional_access : public logic_error { |
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public: |
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explicit bad_optional_access(const string& what_arg) : logic_error{what_arg} {} |
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explicit bad_optional_access(const char* what_arg) : logic_error{what_arg} {} |
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}; |
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template <class T> |
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union storage_t { |
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unsigned char dummy_; |
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T value_; |
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constexpr storage_t(trivial_init_t) noexcept : dummy_(){}; |
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template <class... Args> |
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constexpr storage_t(Args&&... args) : value_(constexpr_forward<Args>(args)...) {} |
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~storage_t() {} |
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}; |
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template <class T> |
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union constexpr_storage_t { |
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unsigned char dummy_; |
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T value_; |
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constexpr constexpr_storage_t(trivial_init_t) noexcept : dummy_(){}; |
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template <class... Args> |
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constexpr constexpr_storage_t(Args&&... args) : value_(constexpr_forward<Args>(args)...) {} |
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~constexpr_storage_t() = default; |
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}; |
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template <class T> |
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struct optional_base { |
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bool init_; |
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storage_t<T> storage_; |
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constexpr optional_base() noexcept : init_(false), storage_(trivial_init){}; |
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explicit constexpr optional_base(const T& v) : init_(true), storage_(v) {} |
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explicit constexpr optional_base(T&& v) : init_(true), storage_(constexpr_move(v)) {} |
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template <class... Args> |
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explicit optional_base(in_place_t, Args&&... args) : init_(true), storage_(constexpr_forward<Args>(args)...) {} |
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template <class U, class... Args, TR2_OPTIONAL_REQUIRES(is_constructible<T, std::initializer_list<U>>)> |
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explicit optional_base(in_place_t, std::initializer_list<U> il, Args&&... args) |
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: init_(true), storage_(il, std::forward<Args>(args)...) {} |
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~optional_base() { |
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if (init_) |
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storage_.value_.T::~T(); |
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} |
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}; |
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template <class T> |
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struct constexpr_optional_base { |
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bool init_; |
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constexpr_storage_t<T> storage_; |
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constexpr constexpr_optional_base() noexcept : init_(false), storage_(trivial_init){}; |
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explicit constexpr constexpr_optional_base(const T& v) : init_(true), storage_(v) {} |
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explicit constexpr constexpr_optional_base(T&& v) : init_(true), storage_(constexpr_move(v)) {} |
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template <class... Args> |
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explicit constexpr constexpr_optional_base(in_place_t, Args&&... args) |
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: init_(true), storage_(constexpr_forward<Args>(args)...) {} |
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template <class U, class... Args, TR2_OPTIONAL_REQUIRES(is_constructible<T, std::initializer_list<U>>)> |
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OPTIONAL_CONSTEXPR_INIT_LIST explicit constexpr_optional_base(in_place_t, std::initializer_list<U> il, Args&&... args) |
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: init_(true), storage_(il, std::forward<Args>(args)...) {} |
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~constexpr_optional_base() = default; |
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}; |
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template <class T> |
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using OptionalBase = |
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typename std::conditional<is_trivially_destructible<T>::value, constexpr_optional_base<T>, optional_base<T>>::type; |
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template <class T> |
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class optional : private OptionalBase<T> { |
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static_assert(!std::is_same<typename std::decay<T>::type, nullopt_t>::value, "bad T"); |
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static_assert(!std::is_same<typename std::decay<T>::type, in_place_t>::value, "bad T"); |
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constexpr bool initialized() const noexcept { return OptionalBase<T>::init_; } |
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T* dataptr() { return std::addressof(OptionalBase<T>::storage_.value_); } |
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constexpr const T* dataptr() const { return detail_::static_addressof(OptionalBase<T>::storage_.value_); } |
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#if OPTIONAL_HAS_THIS_RVALUE_REFS == 1 |
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constexpr const T& contained_val() const& { return OptionalBase<T>::storage_.value_; } |
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#if OPTIONAL_HAS_MOVE_ACCESSORS == 1 |
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OPTIONAL_MUTABLE_CONSTEXPR T&& contained_val() && { return std::move(OptionalBase<T>::storage_.value_); } |
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OPTIONAL_MUTABLE_CONSTEXPR T& contained_val() & { return OptionalBase<T>::storage_.value_; } |
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#else |
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T& contained_val() & { return OptionalBase<T>::storage_.value_; } |
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T&& contained_val() && { return std::move(OptionalBase<T>::storage_.value_); } |
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#endif |
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#else |
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constexpr const T& contained_val() const { return OptionalBase<T>::storage_.value_; } |
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T& contained_val() { return OptionalBase<T>::storage_.value_; } |
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#endif |
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void clear() noexcept { |
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if (initialized()) |
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dataptr()->T::~T(); |
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OptionalBase<T>::init_ = false; |
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} |
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template <class... Args> |
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void initialize(Args&&... args) noexcept(noexcept(T(std::forward<Args>(args)...))) { |
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assert(!OptionalBase<T>::init_); |
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::new (static_cast<void*>(dataptr())) T(std::forward<Args>(args)...); |
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OptionalBase<T>::init_ = true; |
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} |
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template <class U, class... Args> |
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void initialize(std::initializer_list<U> il, Args&&... args) noexcept(noexcept(T(il, std::forward<Args>(args)...))) { |
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assert(!OptionalBase<T>::init_); |
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::new (static_cast<void*>(dataptr())) T(il, std::forward<Args>(args)...); |
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OptionalBase<T>::init_ = true; |
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} |
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public: |
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typedef T value_type; |
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// 20.5.5.1, constructors
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constexpr optional() noexcept : OptionalBase<T>(){}; |
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constexpr optional(nullopt_t) noexcept : OptionalBase<T>(){}; |
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optional(const optional& rhs) : OptionalBase<T>() { |
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if (rhs.initialized()) { |
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::new (static_cast<void*>(dataptr())) T(*rhs); |
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OptionalBase<T>::init_ = true; |
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} |
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} |
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optional(optional&& rhs) noexcept(is_nothrow_move_constructible<T>::value) : OptionalBase<T>() { |
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if (rhs.initialized()) { |
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::new (static_cast<void*>(dataptr())) T(std::move(*rhs)); |
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OptionalBase<T>::init_ = true; |
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} |
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} |
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constexpr optional(const T& v) : OptionalBase<T>(v) {} |
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constexpr optional(T&& v) : OptionalBase<T>(constexpr_move(v)) {} |
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template <class... Args> |
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explicit constexpr optional(in_place_t, Args&&... args) |
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: OptionalBase<T>(in_place_t{}, constexpr_forward<Args>(args)...) {} |
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template <class U, class... Args, TR2_OPTIONAL_REQUIRES(is_constructible<T, std::initializer_list<U>>)> |
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OPTIONAL_CONSTEXPR_INIT_LIST explicit optional(in_place_t, std::initializer_list<U> il, Args&&... args) |
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: OptionalBase<T>(in_place_t{}, il, constexpr_forward<Args>(args)...) {} |
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// 20.5.4.2, Destructor
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~optional() = default; |
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// 20.5.4.3, assignment
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optional& operator=(nullopt_t) noexcept { |
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clear(); |
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return *this; |
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} |
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optional& operator=(const optional& rhs) { |
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if (initialized() == true && rhs.initialized() == false) |
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clear(); |
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else if (initialized() == false && rhs.initialized() == true) |
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initialize(*rhs); |
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else if (initialized() == true && rhs.initialized() == true) |
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contained_val() = *rhs; |
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return *this; |
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} |
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optional& |
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operator=(optional&& rhs) noexcept(is_nothrow_move_assignable<T>::value&& is_nothrow_move_constructible<T>::value) { |
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if (initialized() == true && rhs.initialized() == false) |
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clear(); |
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else if (initialized() == false && rhs.initialized() == true) |
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initialize(std::move(*rhs)); |
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else if (initialized() == true && rhs.initialized() == true) |
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contained_val() = std::move(*rhs); |
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return *this; |
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} |
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template <class U> |
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auto operator=(U&& v) -> typename enable_if<is_same<typename decay<U>::type, T>::value, optional&>::type { |
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if (initialized()) { |
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contained_val() = std::forward<U>(v); |
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} else { |
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initialize(std::forward<U>(v)); |
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} |
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return *this; |
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} |
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template <class... Args> |
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void emplace(Args&&... args) { |
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clear(); |
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initialize(std::forward<Args>(args)...); |
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} |
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template <class U, class... Args> |
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void emplace(initializer_list<U> il, Args&&... args) { |
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clear(); |
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initialize<U, Args...>(il, std::forward<Args>(args)...); |
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} |
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// 20.5.4.4, Swap
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void swap(optional<T>& rhs) noexcept(is_nothrow_move_constructible<T>::value&& noexcept(swap(declval<T&>(), |
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declval<T&>()))) { |
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if (initialized() == true && rhs.initialized() == false) { |
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rhs.initialize(std::move(**this)); |
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clear(); |
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} else if (initialized() == false && rhs.initialized() == true) { |
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initialize(std::move(*rhs)); |
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rhs.clear(); |
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} else if (initialized() == true && rhs.initialized() == true) { |
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using std::swap; |
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swap(**this, *rhs); |
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} |
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} |
||||
|
||||
// 20.5.4.5, Observers
|
||||
|
||||
explicit constexpr operator bool() const noexcept { return initialized(); } |
||||
|
||||
constexpr T const* operator->() const { return TR2_OPTIONAL_ASSERTED_EXPRESSION(initialized(), dataptr()); } |
||||
|
||||
#if OPTIONAL_HAS_MOVE_ACCESSORS == 1 |
||||
|
||||
OPTIONAL_MUTABLE_CONSTEXPR T* operator->() { |
||||
assert(initialized()); |
||||
return dataptr(); |
||||
} |
||||
|
||||
constexpr T const& operator*() const& { return TR2_OPTIONAL_ASSERTED_EXPRESSION(initialized(), contained_val()); } |
||||
|
||||
OPTIONAL_MUTABLE_CONSTEXPR T& operator*() & { |
||||
assert(initialized()); |
||||
return contained_val(); |
||||
} |
||||
|
||||
OPTIONAL_MUTABLE_CONSTEXPR T&& operator*() && { |
||||
assert(initialized()); |
||||
return constexpr_move(contained_val()); |
||||
} |
||||
|
||||
constexpr T const& value() const& { |
||||
if (!initialized()) |
||||
atFatal("bad optional access"); |
||||
return contained_val(); |
||||
} |
||||
|
||||
OPTIONAL_MUTABLE_CONSTEXPR T& value() & { |
||||
if (!initialized()) |
||||
atFatal("bad optional access"); |
||||
return contained_val(); |
||||
} |
||||
|
||||
OPTIONAL_MUTABLE_CONSTEXPR T&& value() && { |
||||
if (!initialized()) |
||||
atFatal("bad optional access"); |
||||
return std::move(contained_val()); |
||||
} |
||||
|
||||
#else |
||||
|
||||
T* operator->() { |
||||
assert(initialized()); |
||||
return dataptr(); |
||||
} |
||||
|
||||
constexpr T const& operator*() const { return TR2_OPTIONAL_ASSERTED_EXPRESSION(initialized(), contained_val()); } |
||||
|
||||
T& operator*() { |
||||
assert(initialized()); |
||||
return contained_val(); |
||||
} |
||||
|
||||
constexpr T const& value() const { |
||||
if (!initialized()) |
||||
atFatal("bad optional access"); |
||||
return contained_val(); |
||||
} |
||||
|
||||
T& value() { |
||||
if (!initialized()) |
||||
atFatal("bad optional access"); |
||||
return contained_val(); |
||||
} |
||||
|
||||
#endif |
||||
|
||||
#if OPTIONAL_HAS_THIS_RVALUE_REFS == 1 |
||||
|
||||
template <class V> |
||||
constexpr T value_or(V&& v) const& { |
||||
return *this ? **this : detail_::convert<T>(constexpr_forward<V>(v)); |
||||
} |
||||
|
||||
#if OPTIONAL_HAS_MOVE_ACCESSORS == 1 |
||||
|
||||
template <class V> |
||||
OPTIONAL_MUTABLE_CONSTEXPR T value_or(V&& v) && { |
||||
return *this ? constexpr_move(const_cast<optional<T>&>(*this).contained_val()) |
||||
: detail_::convert<T>(constexpr_forward<V>(v)); |
||||
} |
||||
|
||||
#else |
||||
|
||||
template <class V> |
||||
T value_or(V&& v) && { |
||||
return *this ? constexpr_move(const_cast<optional<T>&>(*this).contained_val()) |
||||
: detail_::convert<T>(constexpr_forward<V>(v)); |
||||
} |
||||
|
||||
#endif |
||||
|
||||
#else |
||||
|
||||
template <class V> |
||||
constexpr T value_or(V&& v) const { |
||||
return *this ? **this : detail_::convert<T>(constexpr_forward<V>(v)); |
||||
} |
||||
|
||||
#endif |
||||
}; |
||||
|
||||
template <class T> |
||||
class optional<T&> { |
||||
static_assert(!std::is_same<T, nullopt_t>::value, "bad T"); |
||||
static_assert(!std::is_same<T, in_place_t>::value, "bad T"); |
||||
T* ref; |
||||
|
||||
public: |
||||
// 20.5.5.1, construction/destruction
|
||||
constexpr optional() noexcept : ref(nullptr) {} |
||||
|
||||
constexpr optional(nullopt_t) noexcept : ref(nullptr) {} |
||||
|
||||
constexpr optional(T& v) noexcept : ref(detail_::static_addressof(v)) {} |
||||
|
||||
optional(T&&) = delete; |
||||
|
||||
constexpr optional(const optional& rhs) noexcept : ref(rhs.ref) {} |
||||
|
||||
explicit constexpr optional(in_place_t, T& v) noexcept : ref(detail_::static_addressof(v)) {} |
||||
|
||||
explicit optional(in_place_t, T&&) = delete; |
||||
|
||||
~optional() = default; |
||||
|
||||
// 20.5.5.2, mutation
|
||||
optional& operator=(nullopt_t) noexcept { |
||||
ref = nullptr; |
||||
return *this; |
||||
} |
||||
|
||||
// optional& operator=(const optional& rhs) noexcept {
|
||||
// ref = rhs.ref;
|
||||
// return *this;
|
||||
// }
|
||||
|
||||
// optional& operator=(optional&& rhs) noexcept {
|
||||
// ref = rhs.ref;
|
||||
// return *this;
|
||||
// }
|
||||
|
||||
template <typename U> |
||||
auto operator=(U&& rhs) noexcept -> |
||||
typename enable_if<is_same<typename decay<U>::type, optional<T&>>::value, optional&>::type { |
||||
ref = rhs.ref; |
||||
return *this; |
||||
} |
||||
|
||||
template <typename U> |
||||
auto operator=(U&& rhs) noexcept -> |
||||
typename enable_if<!is_same<typename decay<U>::type, optional<T&>>::value, optional&>::type = delete; |
||||
|
||||
void emplace(T& v) noexcept { ref = detail_::static_addressof(v); } |
||||
|
||||
void emplace(T&&) = delete; |
||||
|
||||
void swap(optional<T&>& rhs) noexcept { std::swap(ref, rhs.ref); } |
||||
|
||||
// 20.5.5.3, observers
|
||||
constexpr T* operator->() const { return TR2_OPTIONAL_ASSERTED_EXPRESSION(ref, ref); } |
||||
|
||||
constexpr T& operator*() const { return TR2_OPTIONAL_ASSERTED_EXPRESSION(ref, *ref); } |
||||
|
||||
constexpr T& value() const { |
||||
if (!ref) |
||||
atFatal("bad optional access"); |
||||
return *ref; |
||||
} |
||||
|
||||
explicit constexpr operator bool() const noexcept { return ref != nullptr; } |
||||
|
||||
template <class V> |
||||
constexpr typename decay<T>::type value_or(V&& v) const { |
||||
return *this ? **this : detail_::convert<typename decay<T>::type>(constexpr_forward<V>(v)); |
||||
} |
||||
}; |
||||
|
||||
template <class T> |
||||
class optional<T&&> { |
||||
static_assert(sizeof(T) == 0, "optional rvalue references disallowed"); |
||||
}; |
||||
|
||||
// 20.5.8, Relational operators
|
||||
template <class T> |
||||
constexpr bool operator==(const optional<T>& x, const optional<T>& y) { |
||||
return bool(x) != bool(y) ? false : bool(x) == false ? true : *x == *y; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator!=(const optional<T>& x, const optional<T>& y) { |
||||
return !(x == y); |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator<(const optional<T>& x, const optional<T>& y) { |
||||
return (!y) ? false : (!x) ? true : *x < *y; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator>(const optional<T>& x, const optional<T>& y) { |
||||
return (y < x); |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator<=(const optional<T>& x, const optional<T>& y) { |
||||
return !(y < x); |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator>=(const optional<T>& x, const optional<T>& y) { |
||||
return !(x < y); |
||||
} |
||||
|
||||
// 20.5.9, Comparison with nullopt
|
||||
template <class T> |
||||
constexpr bool operator==(const optional<T>& x, nullopt_t) noexcept { |
||||
return (!x); |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator==(nullopt_t, const optional<T>& x) noexcept { |
||||
return (!x); |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator!=(const optional<T>& x, nullopt_t) noexcept { |
||||
return bool(x); |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator!=(nullopt_t, const optional<T>& x) noexcept { |
||||
return bool(x); |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator<(const optional<T>&, nullopt_t) noexcept { |
||||
return false; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator<(nullopt_t, const optional<T>& x) noexcept { |
||||
return bool(x); |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator<=(const optional<T>& x, nullopt_t) noexcept { |
||||
return (!x); |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator<=(nullopt_t, const optional<T>&) noexcept { |
||||
return true; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator>(const optional<T>& x, nullopt_t) noexcept { |
||||
return bool(x); |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator>(nullopt_t, const optional<T>&) noexcept { |
||||
return false; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator>=(const optional<T>&, nullopt_t) noexcept { |
||||
return true; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator>=(nullopt_t, const optional<T>& x) noexcept { |
||||
return (!x); |
||||
} |
||||
|
||||
// 20.5.10, Comparison with T
|
||||
template <class T> |
||||
constexpr bool operator==(const optional<T>& x, const T& v) { |
||||
return bool(x) ? *x == v : false; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator==(const T& v, const optional<T>& x) { |
||||
return bool(x) ? v == *x : false; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator!=(const optional<T>& x, const T& v) { |
||||
return bool(x) ? *x != v : true; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator!=(const T& v, const optional<T>& x) { |
||||
return bool(x) ? v != *x : true; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator<(const optional<T>& x, const T& v) { |
||||
return bool(x) ? *x < v : true; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator>(const T& v, const optional<T>& x) { |
||||
return bool(x) ? v > *x : true; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator>(const optional<T>& x, const T& v) { |
||||
return bool(x) ? *x > v : false; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator<(const T& v, const optional<T>& x) { |
||||
return bool(x) ? v < *x : false; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator>=(const optional<T>& x, const T& v) { |
||||
return bool(x) ? *x >= v : false; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator<=(const T& v, const optional<T>& x) { |
||||
return bool(x) ? v <= *x : false; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator<=(const optional<T>& x, const T& v) { |
||||
return bool(x) ? *x <= v : true; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator>=(const T& v, const optional<T>& x) { |
||||
return bool(x) ? v >= *x : true; |
||||
} |
||||
|
||||
// Comparison of optional<T&> with T
|
||||
template <class T> |
||||
constexpr bool operator==(const optional<T&>& x, const T& v) { |
||||
return bool(x) ? *x == v : false; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator==(const T& v, const optional<T&>& x) { |
||||
return bool(x) ? v == *x : false; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator!=(const optional<T&>& x, const T& v) { |
||||
return bool(x) ? *x != v : true; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator!=(const T& v, const optional<T&>& x) { |
||||
return bool(x) ? v != *x : true; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator<(const optional<T&>& x, const T& v) { |
||||
return bool(x) ? *x < v : true; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator>(const T& v, const optional<T&>& x) { |
||||
return bool(x) ? v > *x : true; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator>(const optional<T&>& x, const T& v) { |
||||
return bool(x) ? *x > v : false; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator<(const T& v, const optional<T&>& x) { |
||||
return bool(x) ? v < *x : false; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator>=(const optional<T&>& x, const T& v) { |
||||
return bool(x) ? *x >= v : false; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator<=(const T& v, const optional<T&>& x) { |
||||
return bool(x) ? v <= *x : false; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator<=(const optional<T&>& x, const T& v) { |
||||
return bool(x) ? *x <= v : true; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator>=(const T& v, const optional<T&>& x) { |
||||
return bool(x) ? v >= *x : true; |
||||
} |
||||
|
||||
// Comparison of optional<T const&> with T
|
||||
template <class T> |
||||
constexpr bool operator==(const optional<const T&>& x, const T& v) { |
||||
return bool(x) ? *x == v : false; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator==(const T& v, const optional<const T&>& x) { |
||||
return bool(x) ? v == *x : false; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator!=(const optional<const T&>& x, const T& v) { |
||||
return bool(x) ? *x != v : true; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator!=(const T& v, const optional<const T&>& x) { |
||||
return bool(x) ? v != *x : true; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator<(const optional<const T&>& x, const T& v) { |
||||
return bool(x) ? *x < v : true; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator>(const T& v, const optional<const T&>& x) { |
||||
return bool(x) ? v > *x : true; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator>(const optional<const T&>& x, const T& v) { |
||||
return bool(x) ? *x > v : false; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator<(const T& v, const optional<const T&>& x) { |
||||
return bool(x) ? v < *x : false; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator>=(const optional<const T&>& x, const T& v) { |
||||
return bool(x) ? *x >= v : false; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator<=(const T& v, const optional<const T&>& x) { |
||||
return bool(x) ? v <= *x : false; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator<=(const optional<const T&>& x, const T& v) { |
||||
return bool(x) ? *x <= v : true; |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr bool operator>=(const T& v, const optional<const T&>& x) { |
||||
return bool(x) ? v >= *x : true; |
||||
} |
||||
|
||||
// 20.5.12, Specialized algorithms
|
||||
template <class T> |
||||
void swap(optional<T>& x, optional<T>& y) noexcept(noexcept(x.swap(y))) { |
||||
x.swap(y); |
||||
} |
||||
|
||||
template <class T> |
||||
constexpr optional<typename decay<T>::type> make_optional(T&& v) { |
||||
return optional<typename decay<T>::type>(constexpr_forward<T>(v)); |
||||
} |
||||
|
||||
template <class X> |
||||
constexpr optional<X&> make_optional(reference_wrapper<X> v) { |
||||
return optional<X&>(v.get()); |
||||
} |
||||
|
||||
} // namespace experimental
|
||||
} // namespace std
|
||||
|
||||
namespace std { |
||||
template <typename T> |
||||
struct hash<std::experimental::optional<T>> { |
||||
typedef typename hash<T>::result_type result_type; |
||||
typedef std::experimental::optional<T> argument_type; |
||||
|
||||
constexpr result_type operator()(argument_type const& arg) const { |
||||
return arg ? std::hash<T>{}(*arg) : result_type{}; |
||||
} |
||||
}; |
||||
|
||||
template <typename T> |
||||
struct hash<std::experimental::optional<T&>> { |
||||
typedef typename hash<T>::result_type result_type; |
||||
typedef std::experimental::optional<T&> argument_type; |
||||
|
||||
constexpr result_type operator()(argument_type const& arg) const { |
||||
return arg ? std::hash<T>{}(*arg) : result_type{}; |
||||
} |
||||
}; |
||||
} // namespace std
|
||||
|
||||
#undef TR2_OPTIONAL_REQUIRES |
||||
#undef TR2_OPTIONAL_ASSERTED_EXPRESSION |
||||
|
||||
#endif //___OPTIONAL_HPP___
|
||||