Creation of LTS branch "lts_2020_02_25"20200225

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GitOrigin-RevId: 0033c9ea91a52ade7c6b725aa2ef3cbe15463421
Change-Id: I8a2b70063cb3ab40c6943a6db0fe40cae71ed8d7

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_