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base / tuple_unittest.cc [blame]
// Copyright 2006-2008 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/tuple.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace {
void DoAdd(int a, int b, int c, int* res) {
*res = a + b + c;
}
struct Addy {
Addy() = default;
void DoAdd(int a, int b, int c, int d, int* res) {
*res = a + b + c + d;
}
};
struct Addz {
Addz() = default;
void DoAdd(int a, int b, int c, int d, int e, int* res) {
*res = a + b + c + d + e;
}
};
} // namespace
TEST(TupleTest, Basic) {
std::tuple<int> t1(1);
std::tuple<int, int, int, int*> t4(1, 2, 3, &std::get<0>(t1));
std::tuple<int, int, int, int, int*> t5(1, 2, 3, 4, &std::get<0>(t4));
std::tuple<int, int, int, int, int, int*> t6(1, 2, 3, 4, 5, &std::get<0>(t4));
EXPECT_EQ(1, std::get<0>(t1));
DispatchToFunction(&DoAdd, t4);
EXPECT_EQ(6, std::get<0>(t1));
int res = 0;
DispatchToFunction(&DoAdd, std::make_tuple(9, 8, 7, &res));
EXPECT_EQ(24, res);
Addy addy;
EXPECT_EQ(1, std::get<0>(t4));
DispatchToMethod(&addy, &Addy::DoAdd, t5);
EXPECT_EQ(10, std::get<0>(t4));
Addz addz;
EXPECT_EQ(10, std::get<0>(t4));
DispatchToMethod(&addz, &Addz::DoAdd, t6);
EXPECT_EQ(15, std::get<0>(t4));
}
namespace {
struct CopyLogger {
CopyLogger() { ++TimesConstructed; }
CopyLogger(const CopyLogger& tocopy) { ++TimesConstructed; ++TimesCopied; }
~CopyLogger() = default;
static int TimesCopied;
static int TimesConstructed;
};
void SomeLoggerMethRef(const CopyLogger& logy, const CopyLogger* ptr, bool* b) {
*b = &logy == ptr;
}
void SomeLoggerMethCopy(CopyLogger logy, const CopyLogger* ptr, bool* b) {
*b = &logy == ptr;
}
int CopyLogger::TimesCopied = 0;
int CopyLogger::TimesConstructed = 0;
} // namespace
TEST(TupleTest, Copying) {
CopyLogger logger;
EXPECT_EQ(0, CopyLogger::TimesCopied);
EXPECT_EQ(1, CopyLogger::TimesConstructed);
bool res = false;
// Creating the tuple should copy the class to store internally in the tuple.
std::tuple<CopyLogger, CopyLogger*, bool*> tuple(logger, &logger, &res);
std::get<CopyLogger*>(tuple) = &std::get<CopyLogger>(tuple);
EXPECT_EQ(2, CopyLogger::TimesConstructed);
EXPECT_EQ(1, CopyLogger::TimesCopied);
// Our internal Logger and the one passed to the function should be the same.
res = false;
DispatchToFunction(&SomeLoggerMethRef, tuple);
EXPECT_TRUE(res);
EXPECT_EQ(2, CopyLogger::TimesConstructed);
EXPECT_EQ(1, CopyLogger::TimesCopied);
// Now they should be different, since the function call will make a copy.
res = false;
DispatchToFunction(&SomeLoggerMethCopy, tuple);
EXPECT_FALSE(res);
EXPECT_EQ(3, CopyLogger::TimesConstructed);
EXPECT_EQ(2, CopyLogger::TimesCopied);
}
} // namespace base