66 lines
1.3 KiB
C++
66 lines
1.3 KiB
C++
|
//===----------------------------------------------------------------------===//
|
||
|
|
//
|
||
|
|
// 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.
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
// <optional>
|
||
|
|
|
||
|
|
// constexpr optional() noexcept;
|
||
|
|
|
||
|
|
#include <optional>
|
||
|
|
#include <type_traits>
|
||
|
|
#include <cassert>
|
||
|
|
|
||
|
|
#if _LIBCPP_STD_VER > 11
|
||
|
|
|
||
|
|
template <class Opt>
|
||
|
|
void
|
||
|
|
test_constexpr()
|
||
|
|
{
|
||
|
|
static_assert(std::is_nothrow_default_constructible<Opt>::value, "");
|
||
|
|
constexpr Opt opt;
|
||
|
|
static_assert(static_cast<bool>(opt) == false, "");
|
||
|
|
|
||
|
|
struct test_constexpr_ctor
|
||
|
|
: public Opt
|
||
|
|
{
|
||
|
|
constexpr test_constexpr_ctor() {}
|
||
|
|
};
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
template <class Opt>
|
||
|
|
void
|
||
|
|
test()
|
||
|
|
{
|
||
|
|
static_assert(std::is_nothrow_default_constructible<Opt>::value, "");
|
||
|
|
Opt opt;
|
||
|
|
assert(static_cast<bool>(opt) == false);
|
||
|
|
|
||
|
|
struct test_constexpr_ctor
|
||
|
|
: public Opt
|
||
|
|
{
|
||
|
|
constexpr test_constexpr_ctor() {}
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
struct X
|
||
|
|
{
|
||
|
|
X();
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif // _LIBCPP_STD_VER > 11
|
||
|
|
|
||
|
|
int main()
|
||
|
|
{
|
||
|
|
#if _LIBCPP_STD_VER > 11
|
||
|
|
test_constexpr<std::optional<int>>();
|
||
|
|
test_constexpr<std::optional<int*>>();
|
||
|
|
test<std::optional<X>>();
|
||
|
|
#endif // _LIBCPP_STD_VER > 11
|
||
|
|
}
|