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author | Abseil Team <absl-team@google.com> | 2020-02-25 22:27:31 +0100 |
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committer | CJ Johnson <johnsoncj@google.com> | 2020-02-25 17:56:58 -0500 |
commit | b832dce8489ef7b6231384909fd9b68d5a5ff2b7 (patch) | |
tree | 3ad4be9a9a4105366be714da9458e076a77be18f /absl/random/internal/mock_overload_set.h | |
parent | aa844899c937bde5d2b24f276b59997e5b668bde (diff) |
Creation of LTS branch "lts_2020_02_25"20200225
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GitOrigin-RevId: 0033c9ea91a52ade7c6b725aa2ef3cbe15463421
Change-Id: I8a2b70063cb3ab40c6943a6db0fe40cae71ed8d7
Diffstat (limited to 'absl/random/internal/mock_overload_set.h')
-rw-r--r-- | absl/random/internal/mock_overload_set.h | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/absl/random/internal/mock_overload_set.h b/absl/random/internal/mock_overload_set.h new file mode 100644 index 00000000..c2a30d89 --- /dev/null +++ b/absl/random/internal/mock_overload_set.h @@ -0,0 +1,91 @@ +// +// Copyright 2019 The Abseil Authors. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +#ifndef ABSL_RANDOM_INTERNAL_MOCK_OVERLOAD_SET_H_ +#define ABSL_RANDOM_INTERNAL_MOCK_OVERLOAD_SET_H_ + +#include <type_traits> + +#include "gmock/gmock.h" +#include "gtest/gtest.h" +#include "absl/random/mocking_bit_gen.h" + +namespace absl { +ABSL_NAMESPACE_BEGIN +namespace random_internal { + +template <typename DistrT, typename Fn> +struct MockSingleOverload; + +// MockSingleOverload +// +// MockSingleOverload hooks in to gMock's `ON_CALL` and `EXPECT_CALL` macros. +// EXPECT_CALL(mock_single_overload, Call(...))` will expand to a call to +// `mock_single_overload.gmock_Call(...)`. Because expectations are stored on +// the MockingBitGen (an argument passed inside `Call(...)`), this forwards to +// arguments to Mocking::Register. +template <typename DistrT, typename Ret, typename... Args> +struct MockSingleOverload<DistrT, Ret(MockingBitGen&, Args...)> { + static_assert(std::is_same<typename DistrT::result_type, Ret>::value, + "Overload signature must have return type matching the " + "distributions result type."); + auto gmock_Call( + absl::MockingBitGen& gen, // NOLINT(google-runtime-references) + const ::testing::Matcher<Args>&... args) + -> decltype(gen.Register<DistrT, Args...>(args...)) { + return gen.Register<DistrT, Args...>(args...); + } +}; + +template <typename DistrT, typename Ret, typename Arg, typename... Args> +struct MockSingleOverload<DistrT, Ret(Arg, MockingBitGen&, Args...)> { + static_assert(std::is_same<typename DistrT::result_type, Ret>::value, + "Overload signature must have return type matching the " + "distributions result type."); + auto gmock_Call( + const ::testing::Matcher<Arg>& arg, + absl::MockingBitGen& gen, // NOLINT(google-runtime-references) + const ::testing::Matcher<Args>&... args) + -> decltype(gen.Register<DistrT, Arg, Args...>(arg, args...)) { + return gen.Register<DistrT, Arg, Args...>(arg, args...); + } +}; + +// MockOverloadSet +// +// MockOverloadSet takes a distribution and a collection of signatures and +// performs overload resolution amongst all the overloads. This makes +// `EXPECT_CALL(mock_overload_set, Call(...))` expand and do overload resolution +// correctly. +template <typename DistrT, typename... Signatures> +struct MockOverloadSet; + +template <typename DistrT, typename Sig> +struct MockOverloadSet<DistrT, Sig> : public MockSingleOverload<DistrT, Sig> { + using MockSingleOverload<DistrT, Sig>::gmock_Call; +}; + +template <typename DistrT, typename FirstSig, typename... Rest> +struct MockOverloadSet<DistrT, FirstSig, Rest...> + : public MockSingleOverload<DistrT, FirstSig>, + public MockOverloadSet<DistrT, Rest...> { + using MockSingleOverload<DistrT, FirstSig>::gmock_Call; + using MockOverloadSet<DistrT, Rest...>::gmock_Call; +}; + +} // namespace random_internal +ABSL_NAMESPACE_END +} // namespace absl +#endif // ABSL_RANDOM_INTERNAL_MOCK_OVERLOAD_SET_H_ |