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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 <tuple>
#include <type_traits>
#include "gmock/gmock.h"
#include "absl/base/config.h"
#include "absl/random/internal/mock_helpers.h"
#include "absl/random/mocking_bit_gen.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace random_internal {
template <typename DistrT, typename ValidatorT, 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 MockingBitGen::Register.
//
// The underlying KeyT must match the KeyT constructed by DistributionCaller.
template <typename DistrT, typename ValidatorT, typename Ret, typename... Args>
struct MockSingleOverload<DistrT, ValidatorT, Ret(MockingBitGen&, Args...)> {
static_assert(std::is_same<typename DistrT::result_type, Ret>::value,
"Overload signature must have return type matching the "
"distribution result_type.");
using KeyT = Ret(DistrT, std::tuple<Args...>);
template <typename MockURBG>
auto gmock_Call(MockURBG& gen, const ::testing::Matcher<Args>&... matchers)
-> decltype(MockHelpers::MockFor<KeyT>(gen, ValidatorT())
.gmock_Call(matchers...)) {
static_assert(
std::is_base_of<MockingBitGenImpl<true>, MockURBG>::value ||
std::is_base_of<MockingBitGenImpl<false>, MockURBG>::value,
"Mocking requires an absl::MockingBitGen");
return MockHelpers::MockFor<KeyT>(gen, ValidatorT())
.gmock_Call(matchers...);
}
};
template <typename DistrT, typename ValidatorT, typename Ret, typename Arg,
typename... Args>
struct MockSingleOverload<DistrT, ValidatorT,
Ret(Arg, MockingBitGen&, Args...)> {
static_assert(std::is_same<typename DistrT::result_type, Ret>::value,
"Overload signature must have return type matching the "
"distribution result_type.");
using KeyT = Ret(DistrT, std::tuple<Arg, Args...>);
template <typename MockURBG>
auto gmock_Call(const ::testing::Matcher<Arg>& matcher, MockURBG& gen,
const ::testing::Matcher<Args>&... matchers)
-> decltype(MockHelpers::MockFor<KeyT>(gen, ValidatorT())
.gmock_Call(matcher, matchers...)) {
static_assert(
std::is_base_of<MockingBitGenImpl<true>, MockURBG>::value ||
std::is_base_of<MockingBitGenImpl<false>, MockURBG>::value,
"Mocking requires an absl::MockingBitGen");
return MockHelpers::MockFor<KeyT>(gen, ValidatorT())
.gmock_Call(matcher, matchers...);
}
};
// MockOverloadSetWithValidator
//
// MockOverloadSetWithValidator is a wrapper around MockOverloadSet which takes
// an additional Validator parameter, allowing for customization of the mock
// behavior.
//
// `ValidatorT::Validate(result, args...)` will be called after the mock
// distribution returns a value in `result`, allowing for validation against the
// args.
template <typename DistrT, typename ValidatorT, typename... Fns>
struct MockOverloadSetWithValidator;
template <typename DistrT, typename ValidatorT, typename Sig>
struct MockOverloadSetWithValidator<DistrT, ValidatorT, Sig>
: public MockSingleOverload<DistrT, ValidatorT, Sig> {
using MockSingleOverload<DistrT, ValidatorT, Sig>::gmock_Call;
};
template <typename DistrT, typename ValidatorT, typename FirstSig,
typename... Rest>
struct MockOverloadSetWithValidator<DistrT, ValidatorT, FirstSig, Rest...>
: public MockSingleOverload<DistrT, ValidatorT, FirstSig>,
public MockOverloadSetWithValidator<DistrT, ValidatorT, Rest...> {
using MockSingleOverload<DistrT, ValidatorT, FirstSig>::gmock_Call;
using MockOverloadSetWithValidator<DistrT, ValidatorT, Rest...>::gmock_Call;
};
// 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>
using MockOverloadSet =
MockOverloadSetWithValidator<DistrT, NoOpValidator, Signatures...>;
} // namespace random_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_RANDOM_INTERNAL_MOCK_OVERLOAD_SET_H_
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