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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03
// <tuple>
// template <class... Types> class tuple;
// template <class Alloc>
// tuple(allocator_arg_t, const Alloc& a);
// NOTE: this constructor does not currently support tags derived from
// allocator_arg_t because libc++ has to deduce the parameter as a template
// argument. See PR27684 (https://llvm.org/bugs/show_bug.cgi?id=27684)
#include <tuple>
#include <cassert>
#include "DefaultOnly.h"
#include "allocators.h"
#include "../alloc_first.h"
#include "../alloc_last.h"
template <class T = void>
struct NonDefaultConstructible {
constexpr NonDefaultConstructible() {
static_assert(!std::is_same<T, T>::value, "Default Ctor instantiated");
}
explicit constexpr NonDefaultConstructible(int) {}
};
struct DerivedFromAllocArgT : std::allocator_arg_t {};
int main()
{
{
std::tuple<> t(std::allocator_arg, A1<int>());
}
{
std::tuple<int> t(std::allocator_arg, A1<int>());
assert(std::get<0>(t) == 0);
}
{
std::tuple<DefaultOnly> t(std::allocator_arg, A1<int>());
assert(std::get<0>(t) == DefaultOnly());
}
{
assert(!alloc_first::allocator_constructed);
std::tuple<alloc_first> t(std::allocator_arg, A1<int>(5));
assert(alloc_first::allocator_constructed);
assert(std::get<0>(t) == alloc_first());
}
{
assert(!alloc_last::allocator_constructed);
std::tuple<alloc_last> t(std::allocator_arg, A1<int>(5));
assert(alloc_last::allocator_constructed);
assert(std::get<0>(t) == alloc_last());
}
{
alloc_first::allocator_constructed = false;
std::tuple<DefaultOnly, alloc_first> t(std::allocator_arg, A1<int>(5));
assert(std::get<0>(t) == DefaultOnly());
assert(alloc_first::allocator_constructed);
assert(std::get<1>(t) == alloc_first());
}
{
alloc_first::allocator_constructed = false;
alloc_last::allocator_constructed = false;
std::tuple<DefaultOnly, alloc_first, alloc_last> t(std::allocator_arg,
A1<int>(5));
assert(std::get<0>(t) == DefaultOnly());
assert(alloc_first::allocator_constructed);
assert(std::get<1>(t) == alloc_first());
assert(alloc_last::allocator_constructed);
assert(std::get<2>(t) == alloc_last());
}
{
alloc_first::allocator_constructed = false;
alloc_last::allocator_constructed = false;
std::tuple<DefaultOnly, alloc_first, alloc_last> t(std::allocator_arg,
A2<int>(5));
assert(std::get<0>(t) == DefaultOnly());
assert(!alloc_first::allocator_constructed);
assert(std::get<1>(t) == alloc_first());
assert(!alloc_last::allocator_constructed);
assert(std::get<2>(t) == alloc_last());
}
{
// Test that the uses-allocator default constructor does not evaluate
// it's SFINAE when it otherwise shouldn't be selected. Do this by
// using 'NonDefaultConstructible' which will cause a compile error
// if std::is_default_constructible is evaluated on it.
using T = NonDefaultConstructible<>;
T v(42);
std::tuple<T, T> t(v, v);
std::tuple<T, T> t2(42, 42);
}
}
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