101 lines
4.0 KiB
C
101 lines
4.0 KiB
C
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//
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// Copyright 2019 The Abseil 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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// https://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 ABSL_RANDOM_INTERNAL_MOCK_OVERLOAD_SET_H_
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#define ABSL_RANDOM_INTERNAL_MOCK_OVERLOAD_SET_H_
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#include <type_traits>
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#include "gmock/gmock.h"
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#include "absl/random/internal/mock_helpers.h"
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#include "absl/random/mocking_bit_gen.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace random_internal {
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template <typename DistrT, typename Fn>
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struct MockSingleOverload;
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// MockSingleOverload
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//
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// MockSingleOverload hooks in to gMock's `ON_CALL` and `EXPECT_CALL` macros.
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// EXPECT_CALL(mock_single_overload, Call(...))` will expand to a call to
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// `mock_single_overload.gmock_Call(...)`. Because expectations are stored on
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// the MockingBitGen (an argument passed inside `Call(...)`), this forwards to
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// arguments to MockingBitGen::Register.
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//
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// The underlying KeyT must match the KeyT constructed by DistributionCaller.
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template <typename DistrT, typename Ret, typename... Args>
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struct MockSingleOverload<DistrT, Ret(MockingBitGen&, Args...)> {
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static_assert(std::is_same<typename DistrT::result_type, Ret>::value,
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"Overload signature must have return type matching the "
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"distribution result_type.");
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using KeyT = Ret(DistrT, std::tuple<Args...>);
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template <typename MockURBG>
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auto gmock_Call(MockURBG& gen, const ::testing::Matcher<Args>&... matchers)
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-> decltype(MockHelpers::MockFor<KeyT>(gen).gmock_Call(matchers...)) {
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static_assert(std::is_base_of<MockingBitGen, MockURBG>::value,
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"Mocking requires an absl::MockingBitGen");
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return MockHelpers::MockFor<KeyT>(gen).gmock_Call(matchers...);
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}
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};
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template <typename DistrT, typename Ret, typename Arg, typename... Args>
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struct MockSingleOverload<DistrT, Ret(Arg, MockingBitGen&, Args...)> {
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static_assert(std::is_same<typename DistrT::result_type, Ret>::value,
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"Overload signature must have return type matching the "
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"distribution result_type.");
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using KeyT = Ret(DistrT, std::tuple<Arg, Args...>);
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template <typename MockURBG>
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auto gmock_Call(const ::testing::Matcher<Arg>& matcher, MockURBG& gen,
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const ::testing::Matcher<Args>&... matchers)
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-> decltype(MockHelpers::MockFor<KeyT>(gen).gmock_Call(matcher,
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matchers...)) {
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static_assert(std::is_base_of<MockingBitGen, MockURBG>::value,
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"Mocking requires an absl::MockingBitGen");
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return MockHelpers::MockFor<KeyT>(gen).gmock_Call(matcher, matchers...);
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}
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};
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// MockOverloadSet
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//
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// MockOverloadSet takes a distribution and a collection of signatures and
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// performs overload resolution amongst all the overloads. This makes
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// `EXPECT_CALL(mock_overload_set, Call(...))` expand and do overload resolution
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// correctly.
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template <typename DistrT, typename... Signatures>
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struct MockOverloadSet;
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template <typename DistrT, typename Sig>
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struct MockOverloadSet<DistrT, Sig> : public MockSingleOverload<DistrT, Sig> {
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using MockSingleOverload<DistrT, Sig>::gmock_Call;
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};
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template <typename DistrT, typename FirstSig, typename... Rest>
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struct MockOverloadSet<DistrT, FirstSig, Rest...>
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: public MockSingleOverload<DistrT, FirstSig>,
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public MockOverloadSet<DistrT, Rest...> {
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using MockSingleOverload<DistrT, FirstSig>::gmock_Call;
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using MockOverloadSet<DistrT, Rest...>::gmock_Call;
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};
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} // namespace random_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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#endif // ABSL_RANDOM_INTERNAL_MOCK_OVERLOAD_SET_H_
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