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authorGravatar Abseil Team <absl-team@google.com>2020-02-25 22:27:31 +0100
committerGravatar CJ Johnson <johnsoncj@google.com>2020-02-25 17:56:58 -0500
commitb832dce8489ef7b6231384909fd9b68d5a5ff2b7 (patch)
tree3ad4be9a9a4105366be714da9458e076a77be18f /absl/random/internal/mock_overload_set.h
parentaa844899c937bde5d2b24f276b59997e5b668bde (diff)
Creation of LTS branch "lts_2020_02_25"20200225
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+//
+// 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_