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// Copyright (c) 2006-2008 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 "base/tuple.h"
#include "base/compiler_specific.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() { }
void DoAdd(int a, int b, int c, int d, int* res) {
*res = a + b + c + d;
}
};
struct Addz {
Addz() { }
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<> t0 = std::make_tuple();
ALLOW_UNUSED_LOCAL(t0);
std::tuple<int> t1(1);
std::tuple<int, const char*> t2 =
std::make_tuple(1, static_cast<const char*>("wee"));
ALLOW_UNUSED_LOCAL(t2);
std::tuple<int, int, int> t3(1, 2, 3);
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() { }
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<1>(tuple) = &std::get<0>(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);
}
TEST(TupleTest, Get) {
int i = 1;
int j = 2;
std::tuple<int, int&, int&&> t(3, i, std::move(j));
EXPECT_TRUE((std::is_same<int&, decltype(base::get<0>(t))>::value));
EXPECT_EQ(3, base::get<0>(t));
EXPECT_TRUE((std::is_same<int&, decltype(base::get<1>(t))>::value));
EXPECT_EQ(1, base::get<1>(t));
EXPECT_TRUE((std::is_same<int&, decltype(base::get<2>(t))>::value));
EXPECT_EQ(2, base::get<2>(t));
EXPECT_TRUE((std::is_same<int&&,
decltype(base::get<0>(std::move(t)))>::value));
EXPECT_EQ(3, base::get<0>(std::move(t)));
EXPECT_TRUE((std::is_same<int&,
decltype(base::get<1>(std::move(t)))>::value));
EXPECT_EQ(1, base::get<1>(std::move(t)));
EXPECT_TRUE((std::is_same<int&&,
decltype(base::get<2>(std::move(t)))>::value));
EXPECT_EQ(2, base::get<2>(std::move(t)));
}
} // namespace base
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