73 lines
1.7 KiB
C++
73 lines
1.7 KiB
C++
|
//===----------------------------------------------------------------------===//
|
||
|
|
//
|
||
|
|
// The LLVM Compiler Infrastructure
|
||
|
|
//
|
||
|
|
// This file is distributed under the University of Illinois Open Source
|
||
|
|
// License. See LICENSE.TXT for details.
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
// <tuple>
|
||
|
|
|
||
|
|
// template<class... Types>
|
||
|
|
// tuple<Types&&...> forward_as_tuple(Types&&... t);
|
||
|
|
|
||
|
|
|
||
|
|
#include <tuple>
|
||
|
|
#include <cassert>
|
||
|
|
|
||
|
|
template <class Tuple>
|
||
|
|
void
|
||
|
|
test0(const Tuple& t)
|
||
|
|
{
|
||
|
|
static_assert(std::tuple_size<Tuple>::value == 0, "");
|
||
|
|
}
|
||
|
|
|
||
|
|
template <class Tuple>
|
||
|
|
void
|
||
|
|
test1a(const Tuple& t)
|
||
|
|
{
|
||
|
|
static_assert(std::tuple_size<Tuple>::value == 1, "");
|
||
|
|
static_assert(std::is_same<typename std::tuple_element<0, Tuple>::type, int&&>::value, "");
|
||
|
|
assert(std::get<0>(t) == 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
template <class Tuple>
|
||
|
|
void
|
||
|
|
test1b(const Tuple& t)
|
||
|
|
{
|
||
|
|
static_assert(std::tuple_size<Tuple>::value == 1, "");
|
||
|
|
static_assert(std::is_same<typename std::tuple_element<0, Tuple>::type, int&>::value, "");
|
||
|
|
assert(std::get<0>(t) == 2);
|
||
|
|
}
|
||
|
|
|
||
|
|
template <class Tuple>
|
||
|
|
void
|
||
|
|
test2a(const Tuple& t)
|
||
|
|
{
|
||
|
|
static_assert(std::tuple_size<Tuple>::value == 2, "");
|
||
|
|
static_assert(std::is_same<typename std::tuple_element<0, Tuple>::type, double&>::value, "");
|
||
|
|
static_assert(std::is_same<typename std::tuple_element<1, Tuple>::type, char&>::value, "");
|
||
|
|
assert(std::get<0>(t) == 2.5);
|
||
|
|
assert(std::get<1>(t) == 'a');
|
||
|
|
}
|
||
|
|
|
||
|
|
int main()
|
||
|
|
{
|
||
|
|
{
|
||
|
|
test0(std::forward_as_tuple());
|
||
|
|
}
|
||
|
|
{
|
||
|
|
test1a(std::forward_as_tuple(1));
|
||
|
|
}
|
||
|
|
{
|
||
|
|
int i = 2;
|
||
|
|
test1b(std::forward_as_tuple(i));
|
||
|
|
}
|
||
|
|
{
|
||
|
|
double i = 2.5;
|
||
|
|
char c = 'a';
|
||
|
|
test2a(std::forward_as_tuple(i, c));
|
||
|
|
}
|
||
|
|
}
|