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102 lines
3.3 KiB
C++
102 lines
3.3 KiB
C++
// Copyright 2017 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_TEST_BIND_H_
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#define BASE_TEST_BIND_H_
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#include <string_view>
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#include <type_traits>
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#include <utility>
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#include "base/functional/bind.h"
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namespace base {
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class Location;
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namespace internal {
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template <typename Signature, typename R, typename F, typename... Args>
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static constexpr bool kHasConstCallOperator = false;
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template <typename R, typename F, typename... Args>
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static constexpr bool
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kHasConstCallOperator<R (F::*)(Args...) const, R, F, Args...> = true;
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// Implementation of `BindLambdaForTesting()`, which checks preconditions before
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// handing off to `Bind{Once,Repeating}()`.
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template <typename Lambda,
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typename = ExtractCallableRunType<std::decay_t<Lambda>>>
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struct BindLambdaForTestingHelper;
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template <typename Lambda, typename R, typename... Args>
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struct BindLambdaForTestingHelper<Lambda, R(Args...)> {
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private:
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using F = std::decay_t<Lambda>;
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// For context on this "templated struct with a lambda that asserts" pattern,
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// see comments in `Invoker<>`.
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template <bool v = std::is_rvalue_reference_v<Lambda&&> &&
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!std::is_const_v<std::remove_reference_t<Lambda>>>
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struct IsNonConstRvalueRef {
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static constexpr bool value = [] {
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static_assert(
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v,
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"BindLambdaForTesting() requires non-const rvalue for mutable lambda "
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"binding, i.e. base::BindLambdaForTesting(std::move(lambda)).");
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return v;
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}();
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};
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static R Run(const F& f, Args... args) {
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return f(std::forward<Args>(args)...);
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}
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static R RunOnce(F&& f, Args... args) {
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return f(std::forward<Args>(args)...);
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}
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public:
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static auto BindLambdaForTesting(Lambda&& lambda) {
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if constexpr (kHasConstCallOperator<decltype(&F::operator()), R, F,
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Args...>) {
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// If WTF::BindRepeating is available, and a callback argument is in WTF,
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// then this call is ambiguous without the full namespace path.
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return ::base::BindRepeating(&Run, std::forward<Lambda>(lambda));
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} else if constexpr (IsNonConstRvalueRef<>::value) {
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// Since a mutable lambda potentially can invalidate its state after being
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// run once, this method returns a `OnceCallback` instead of a
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// `RepeatingCallback`.
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return BindOnce(&RunOnce, std::move(lambda));
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}
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}
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};
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} // namespace internal
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// A variant of `Bind{Once,Repeating}()` that can bind capturing lambdas for
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// testing. This doesn't support extra arguments binding as the lambda itself
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// can do.
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template <typename Lambda>
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auto BindLambdaForTesting(Lambda&& lambda) {
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return internal::BindLambdaForTestingHelper<Lambda>::BindLambdaForTesting(
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std::forward<Lambda>(lambda));
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}
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// Returns a closure that fails on destruction if it hasn't been run.
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OnceClosure MakeExpectedRunClosure(
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const Location& location,
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std::string_view message = std::string_view());
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RepeatingClosure MakeExpectedRunAtLeastOnceClosure(
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const Location& location,
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std::string_view message = std::string_view());
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// Returns a closure that fails the test if run.
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RepeatingClosure MakeExpectedNotRunClosure(
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const Location& location,
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std::string_view message = std::string_view());
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} // namespace base
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#endif // BASE_TEST_BIND_H_
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