97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
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// Copyright 2020 The Dawn Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef COMMON_ITYP_ARRAY_H_
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#define COMMON_ITYP_ARRAY_H_
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#include "common/TypedInteger.h"
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#include "common/UnderlyingType.h"
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#include <array>
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#include <type_traits>
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namespace ityp {
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// ityp::array is a helper class that wraps std::array with the restriction that
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// indices must be a particular type |Index|. Dawn uses multiple flat maps of
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// index-->data, and this class helps ensure an indices cannot be passed interchangably
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// to a flat map of a different type.
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template <typename Index, typename Value, size_t Size>
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class array : private std::array<Value, Size> {
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using I = UnderlyingType<Index>;
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using Base = std::array<Value, Size>;
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static_assert(Size <= std::numeric_limits<I>::max(), "");
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public:
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constexpr array() = default;
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template <typename... Values>
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constexpr array(Values&&... values) : Base{std::forward<Values>(values)...} {
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}
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Value& operator[](Index i) {
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I index = static_cast<I>(i);
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ASSERT(index >= 0 && index < Size);
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return Base::operator[](index);
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}
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constexpr const Value& operator[](Index i) const {
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I index = static_cast<I>(i);
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ASSERT(index >= 0 && index < Size);
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return Base::operator[](index);
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}
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Value& at(Index i) {
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I index = static_cast<I>(i);
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ASSERT(index >= 0 && index < Size);
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return Base::at(index);
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}
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constexpr const Value& at(Index i) const {
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I index = static_cast<I>(i);
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ASSERT(index >= 0 && index < Size);
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return Base::at(index);
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}
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Value* begin() noexcept {
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return Base::begin();
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}
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const Value* begin() const noexcept {
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return Base::begin();
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}
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Value* end() noexcept {
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return Base::end();
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}
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const Value* end() const noexcept {
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return Base::end();
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}
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constexpr Index size() const {
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return Index(static_cast<I>(Size));
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}
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using Base::back;
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using Base::data;
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using Base::empty;
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using Base::front;
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};
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} // namespace ityp
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#endif // COMMON_ITYP_ARRAY_H_
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