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93 lines
3.3 KiB
C++
93 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 <type_traits>
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#include <utility>
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#include "base/functional/bind.h"
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#include "base/strings/string_piece.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 Callable,
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typename Signature = decltype(&Callable::operator())>
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struct HasConstCallOperatorImpl : std::false_type {};
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template <typename Callable, typename R, typename... Args>
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struct HasConstCallOperatorImpl<Callable, R (Callable::*)(Args...) const>
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: std::true_type {};
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template <typename Callable>
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constexpr bool HasConstCallOperator =
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HasConstCallOperatorImpl<std::decay_t<Callable>>::value;
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template <typename F, typename Signature>
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struct BindLambdaHelper;
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template <typename F, typename R, typename... Args>
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struct BindLambdaHelper<F, R(Args...)> {
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static R Run(const std::decay_t<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(std::decay_t<F>&& f, Args... args) {
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return f(std::forward<Args>(args)...);
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}
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};
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} // namespace internal
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// A variant of BindRepeating() that can bind capturing lambdas for testing.
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// This doesn't support extra arguments binding as the lambda itself can do.
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template <typename Lambda,
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std::enable_if_t<internal::HasConstCallOperator<Lambda>>* = nullptr>
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decltype(auto) BindLambdaForTesting(Lambda&& lambda) {
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using Signature = internal::ExtractCallableRunType<std::decay_t<Lambda>>;
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// If WTF::BindRepeating is available, and a callback argument is in WTF, then
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// this call is ambiguous without the full namespace path.
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return ::base::BindRepeating(
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&internal::BindLambdaHelper<Lambda, Signature>::Run,
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std::forward<Lambda>(lambda));
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}
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// A variant of BindOnce() that can bind mutable 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. Since a mutable lambda potentially can invalidate its state after
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// being run once, this method returns a OnceCallback instead of a
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// RepeatingCallback.
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template <typename Lambda,
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std::enable_if_t<!internal::HasConstCallOperator<Lambda>>* = nullptr>
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decltype(auto) BindLambdaForTesting(Lambda&& lambda) {
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static_assert(
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std::is_rvalue_reference<Lambda&&>() &&
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!std::is_const<std::remove_reference_t<Lambda>>(),
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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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using Signature = internal::ExtractCallableRunType<std::decay_t<Lambda>>;
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return BindOnce(&internal::BindLambdaHelper<Lambda, Signature>::RunOnce,
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std::move(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(const Location& location,
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StringPiece message = StringPiece());
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RepeatingClosure MakeExpectedRunAtLeastOnceClosure(
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const Location& location,
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StringPiece message = StringPiece());
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// Returns a closure that fails the test if run.
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RepeatingClosure MakeExpectedNotRunClosure(const Location& location,
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StringPiece message = StringPiece());
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} // namespace base
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#endif // BASE_TEST_BIND_H_
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