1 // Copyright 2017 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef BASE_TEST_BIND_TEST_UTIL_H_ 6 #define BASE_TEST_BIND_TEST_UTIL_H_ 7 8 #include "base/bind.h" 9 10 namespace base { 11 namespace internal { 12 13 template <typename F, typename Signature> 14 struct BindLambdaHelper; 15 16 template <typename F, typename R, typename... Args> 17 struct BindLambdaHelper<F, R(Args...)> { 18 static R Run(const std::decay_t<F>& f, Args... args) { 19 return f(std::forward<Args>(args)...); 20 } 21 }; 22 23 } // namespace internal 24 25 // A variant of Bind() that can bind capturing lambdas for testing. 26 // This doesn't support extra arguments binding as the lambda itself can do. 27 template <typename F> 28 decltype(auto) BindLambdaForTesting(F&& f) { 29 using Signature = internal::ExtractCallableRunType<std::decay_t<F>>; 30 return BindRepeating(&internal::BindLambdaHelper<F, Signature>::Run, 31 std::forward<F>(f)); 32 } 33 34 } // namespace base 35 36 #endif // BASE_TEST_BIND_TEST_UTIL_H_ 37
