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
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
// Copyright 2015 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.
#include "mojo/public/cpp/bindings/callback.h"
#include "mojo/public/cpp/bindings/map.h"
#include "mojo/public/cpp/bindings/string.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace mojo {
namespace test {
namespace {
struct RunnableNoArgs {
explicit RunnableNoArgs(int* calls) : calls(calls) {}
void Run() const { (*calls)++; }
int* calls;
};
struct RunnableOneArg {
explicit RunnableOneArg(int* calls) : calls(calls) {}
void Run(int increment) const { (*calls) += increment; }
int* calls;
};
struct RunnableStringArgByConstRef {
explicit RunnableStringArgByConstRef(int* calls) : calls(calls) {}
void Run(const String& s) const { (*calls)++; }
int* calls;
};
using ExampleMoveOnlyType = Map<int, int>;
struct RunnableMoveOnlyParam {
explicit RunnableMoveOnlyParam(int* calls) : calls(calls) {}
void Run(ExampleMoveOnlyType m) const { (*calls)++; }
int* calls;
};
int* g_calls = nullptr;
void FunctionNoArgs() {
(*g_calls)++;
}
void FunctionOneArg(int increment) {
(*g_calls) += increment;
}
void FunctionStringArgByConstRef(const String& s) {
(*g_calls)++;
}
void FunctionMoveOnlyType(ExampleMoveOnlyType m) {
(*g_calls)++;
}
static_assert(!internal::HasCompatibleCallOperator<RunnableNoArgs>::value,
"HasCompatibleCallOperator<Runnable>");
static_assert(!internal::HasCompatibleCallOperator<RunnableOneArg, int>::value,
"HasCompatibleCallOperator<RunnableOneArg, int>");
static_assert(!internal::HasCompatibleCallOperator<RunnableStringArgByConstRef,
String>::value,
"HasCompatibleCallOperator<RunnableStringArgByConstRef, String>");
static_assert(!internal::HasCompatibleCallOperator<RunnableMoveOnlyParam,
ExampleMoveOnlyType>::value,
"HasCompatibleCallOperator<RunnableMoveOnlyParam, String>");
auto lambda_one = []() {};
static_assert(internal::HasCompatibleCallOperator<decltype(lambda_one)>::value,
"HasCompatibleCallOperator<lambda []() {}>");
auto lambda_two = [](int x) {};
static_assert(
internal::HasCompatibleCallOperator<decltype(lambda_two), int>::value,
"HasCompatibleCallOperator<lambda [](int x) {}, int>");
auto lambda_three = [](const String& s) {};
static_assert(
internal::HasCompatibleCallOperator<decltype(lambda_three), String>::value,
"HasCompatibleCallOperator<lambda [](const String& s) {}, String>");
auto lambda_four = [](ExampleMoveOnlyType m) {};
static_assert(internal::HasCompatibleCallOperator<decltype(lambda_four),
ExampleMoveOnlyType>::value,
"HasCompatibleCallOperator<lambda [](ExampleMoveOnlyType) {}, "
"ExampleMoveOnlyType>");
// Tests constructing and invoking a mojo::Callback from objects with a
// compatible Run() method (called 'runnables'), from lambdas, and from function
// pointers.
TEST(Callback, Create) {
int calls = 0;
RunnableNoArgs f(&calls);
// Construct from a runnable object.
mojo::Callback<void()> cb = f;
cb.Run();
EXPECT_EQ(1, calls);
// Construct from a parameterless lambda that captures one variable.
cb = [&calls]() { calls++; };
cb.Run();
EXPECT_EQ(2, calls);
// Construct from a runnable object with one primitive parameter.
mojo::Callback<void(int)> cb_with_param = RunnableOneArg(&calls);
cb_with_param.Run(1);
EXPECT_EQ(3, calls);
// Construct from a lambda that takes one parameter and captures one variable.
cb_with_param = [&calls](int increment) { calls += increment; };
cb_with_param.Run(1);
EXPECT_EQ(4, calls);
// Construct from a runnable object with one string parameter.
mojo::Callback<void(String)> cb_with_string_param =
RunnableStringArgByConstRef(&calls);
cb_with_string_param.Run(String("hello world"));
EXPECT_EQ(5, calls);
// Construct from a lambda that takes one string parameter.
cb_with_string_param = [&calls](const String& s) { calls++; };
cb_with_string_param.Run(String("world"));
EXPECT_EQ(6, calls);
ExampleMoveOnlyType m;
mojo::Callback<void(ExampleMoveOnlyType)> cb_with_move_only_param =
RunnableMoveOnlyParam(&calls);
cb_with_move_only_param.Run(m.Clone());
EXPECT_EQ(7, calls);
cb_with_move_only_param = [&calls](ExampleMoveOnlyType m) { calls++; };
cb_with_move_only_param.Run(m.Clone());
EXPECT_EQ(8, calls);
// Construct from a function pointer.
g_calls = &calls;
cb = &FunctionNoArgs;
cb.Run();
EXPECT_EQ(9, calls);
cb_with_param = &FunctionOneArg;
cb_with_param.Run(1);
EXPECT_EQ(10, calls);
cb_with_string_param = &FunctionStringArgByConstRef;
cb_with_string_param.Run(String("hello"));
EXPECT_EQ(11, calls);
cb_with_move_only_param = &FunctionMoveOnlyType;
cb_with_move_only_param.Run(m.Clone());
EXPECT_EQ(12, calls);
g_calls = nullptr;
}
bool g_overloaded_function_with_int_param_called = false;
void OverloadedFunction(int param) {
g_overloaded_function_with_int_param_called = true;
}
bool g_overloaded_function_with_double_param_called = false;
void OverloadedFunction(double param) {
g_overloaded_function_with_double_param_called = true;
}
// Tests constructing and invoking a mojo::Callback from pointers to overloaded
// functions.
TEST(Callback, CreateFromOverloadedFunctionPtr) {
g_overloaded_function_with_int_param_called = false;
mojo::Callback<void(int)> cb_with_int_param = &OverloadedFunction;
cb_with_int_param.Run(123);
EXPECT_TRUE(g_overloaded_function_with_int_param_called);
g_overloaded_function_with_int_param_called = false;
g_overloaded_function_with_double_param_called = false;
mojo::Callback<void(double)> cb_with_double_param = &OverloadedFunction;
cb_with_double_param.Run(123);
EXPECT_TRUE(g_overloaded_function_with_double_param_called);
g_overloaded_function_with_double_param_called = false;
}
} // namespace
} // namespace test
} // namespace mojo
|
