1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_TEST_BIND_H_
#define BASE_TEST_BIND_H_
#include <type_traits>
#include <utility>
#include "base/bind.h"
#include "base/strings/string_piece.h"
namespace base {
class Location;
namespace internal {
template <typename Callable,
typename Signature = decltype(&Callable::operator())>
struct HasConstCallOperatorImpl : std::false_type {};
template <typename Callable, typename R, typename... Args>
struct HasConstCallOperatorImpl<Callable, R (Callable::*)(Args...) const>
: std::true_type {};
template <typename Callable>
constexpr bool HasConstCallOperator =
HasConstCallOperatorImpl<std::decay_t<Callable>>::value;
template <typename F, typename Signature>
struct BindLambdaHelper;
template <typename F, typename R, typename... Args>
struct BindLambdaHelper<F, R(Args...)> {
static R Run(const std::decay_t<F>& f, Args... args) {
return f(std::forward<Args>(args)...);
}
static R RunOnce(std::decay_t<F>&& f, Args... args) {
return f(std::forward<Args>(args)...);
}
};
} // namespace internal
// A variant of BindRepeating() that can bind capturing lambdas for testing.
// This doesn't support extra arguments binding as the lambda itself can do.
template <typename Lambda,
std::enable_if_t<internal::HasConstCallOperator<Lambda>>* = nullptr>
decltype(auto) BindLambdaForTesting(Lambda&& lambda) {
using Signature = internal::ExtractCallableRunType<std::decay_t<Lambda>>;
// If WTF::BindRepeating is available, and a callback argument is in WTF, then
// this call is ambiguous without the full namespace path.
return ::base::BindRepeating(
&internal::BindLambdaHelper<Lambda, Signature>::Run,
std::forward<Lambda>(lambda));
}
// A variant of BindOnce() that can bind mutable capturing lambdas for
// testing. This doesn't support extra arguments binding as the lambda itself
// can do. Since a mutable lambda potentially can invalidate its state after
// being run once, this method returns a OnceCallback instead of a
// RepeatingCallback.
template <typename Lambda,
std::enable_if_t<!internal::HasConstCallOperator<Lambda>>* = nullptr>
decltype(auto) BindLambdaForTesting(Lambda&& lambda) {
static_assert(
std::is_rvalue_reference<Lambda&&>() &&
!std::is_const<std::remove_reference_t<Lambda>>(),
"BindLambdaForTesting requires non-const rvalue for mutable lambda "
"binding. I.e.: base::BindLambdaForTesting(std::move(lambda)).");
using Signature = internal::ExtractCallableRunType<std::decay_t<Lambda>>;
return BindOnce(&internal::BindLambdaHelper<Lambda, Signature>::RunOnce,
std::move(lambda));
}
// Returns a closure that fails on destruction if it hasn't been run.
OnceClosure MakeExpectedRunClosure(const Location& location,
StringPiece message = StringPiece());
RepeatingClosure MakeExpectedRunAtLeastOnceClosure(
const Location& location,
StringPiece message = StringPiece());
// Returns a closure that fails the test if run.
RepeatingClosure MakeExpectedNotRunClosure(const Location& location,
StringPiece message = StringPiece());
} // namespace base
#endif // BASE_TEST_BIND_H_
|
