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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>
// optional(optional<T>&& rhs) noexcept(is_nothrow_move_constructible<T>::value);
#include <experimental/optional>
#include <type_traits>
#include <cassert>
#if _LIBCPP_STD_VER > 11
using std::experimental::optional;
template <class T>
void
test(optional<T>& rhs, bool is_going_to_throw = false)
{
static_assert(std::is_nothrow_move_constructible<optional<T>>::value ==
std::is_nothrow_move_constructible<T>::value, "");
bool rhs_engaged = static_cast<bool>(rhs);
try
{
optional<T> lhs = std::move(rhs);
assert(is_going_to_throw == false);
assert(static_cast<bool>(lhs) == rhs_engaged);
}
catch (int i)
{
assert(i == 6);
}
}
class X
{
int i_;
public:
X(int i) : i_(i) {}
X(X&& x) : i_(x.i_) {x.i_ = 0;}
~X() {i_ = 0;}
friend bool operator==(const X& x, const X& y) {return x.i_ == y.i_;}
};
class Y
{
int i_;
public:
Y(int i) : i_(i) {}
Y(Y&& x) noexcept : i_(x.i_) {x.i_ = 0;}
friend constexpr bool operator==(const Y& x, const Y& y) {return x.i_ == y.i_;}
};
int count = 0;
class Z
{
int i_;
public:
Z(int i) : i_(i) {}
Z(Z&&)
{
if (++count == 2)
throw 6;
}
friend constexpr bool operator==(const Z& x, const Z& y) {return x.i_ == y.i_;}
};
#endif // _LIBCPP_STD_VER > 11
int main()
{
#if _LIBCPP_STD_VER > 11
{
typedef int T;
optional<T> rhs;
test(rhs);
}
{
typedef int T;
optional<T> rhs(3);
test(rhs);
}
{
typedef X T;
optional<T> rhs;
test(rhs);
}
{
typedef X T;
optional<T> rhs(X(3));
test(rhs);
}
{
typedef Y T;
optional<T> rhs;
test(rhs);
}
{
typedef Y T;
optional<T> rhs(Y(3));
test(rhs);
}
{
typedef Z T;
optional<T> rhs;
test(rhs);
}
{
typedef Z T;
optional<T> rhs(Z(3));
test(rhs, true);
}
#endif // _LIBCPP_STD_VER > 11
}
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