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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.
//
//===----------------------------------------------------------------------===//
// <optional>
// constexpr optional(const T& v);
#include <optional>
#include <type_traits>
#include <cassert>
#if _LIBCPP_STD_VER > 11
class X
{
int i_;
public:
X(int i) : i_(i) {}
friend bool operator==(const X& x, const X& y) {return x.i_ == y.i_;}
};
class Y
{
int i_;
public:
constexpr Y(int i) : i_(i) {}
friend constexpr bool operator==(const Y& x, const Y& y) {return x.i_ == y.i_;}
};
class Z
{
int i_;
public:
Z(int i) : i_(i) {}
Z(const Z&) {throw 6;}
};
#endif // _LIBCPP_STD_VER > 11
int main()
{
#if _LIBCPP_STD_VER > 11
{
typedef int T;
constexpr T t(5);
constexpr std::optional<T> opt(t);
static_assert(static_cast<bool>(opt) == true, "");
static_assert(*opt == 5, "");
struct test_constexpr_ctor
: public std::optional<T>
{
constexpr test_constexpr_ctor(const T&) {}
};
}
{
typedef double T;
constexpr T t(3);
constexpr std::optional<T> opt(t);
static_assert(static_cast<bool>(opt) == true, "");
static_assert(*opt == 3, "");
struct test_constexpr_ctor
: public std::optional<T>
{
constexpr test_constexpr_ctor(const T&) {}
};
}
{
typedef X T;
const T t(3);
std::optional<T> opt(t);
assert(static_cast<bool>(opt) == true);
assert(*opt == 3);
}
{
typedef Y T;
constexpr T t(3);
constexpr std::optional<T> opt(t);
static_assert(static_cast<bool>(opt) == true, "");
static_assert(*opt == 3, "");
struct test_constexpr_ctor
: public std::optional<T>
{
constexpr test_constexpr_ctor(const T&) {}
};
}
{
typedef Z T;
try
{
const T t(3);
std::optional<T> opt(t);
assert(false);
}
catch (int i)
{
assert(i == 6);
}
}
#endif // _LIBCPP_STD_VER > 11
}
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