| //===----------------------------------------------------------------------===// |
| // |
| // 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> |
| |
| // template <class U> T optional<T>::value_or(U&& v) &&; |
| |
| #include <experimental/optional> |
| #include <type_traits> |
| #include <cassert> |
| |
| #if _LIBCPP_STD_VER > 11 |
| |
| using std::experimental::optional; |
| using std::experimental::in_place_t; |
| using std::experimental::in_place; |
| |
| struct Y |
| { |
| int i_; |
| |
| Y(int i) : i_(i) {} |
| }; |
| |
| struct X |
| { |
| int i_; |
| |
| X(int i) : i_(i) {} |
| X(X&& x) : i_(x.i_) {x.i_ = 0;} |
| X(const Y& y) : i_(y.i_) {} |
| X(Y&& y) : i_(y.i_+1) {} |
| friend constexpr bool operator==(const X& x, const X& y) |
| {return x.i_ == y.i_;} |
| }; |
| |
| #endif // _LIBCPP_STD_VER > 11 |
| |
| int main() |
| { |
| #if _LIBCPP_STD_VER > 11 |
| { |
| optional<X> opt(in_place, 2); |
| Y y(3); |
| assert(std::move(opt).value_or(y) == 2); |
| assert(*opt == 0); |
| } |
| { |
| optional<X> opt(in_place, 2); |
| assert(std::move(opt).value_or(Y(3)) == 2); |
| assert(*opt == 0); |
| } |
| { |
| optional<X> opt; |
| Y y(3); |
| assert(std::move(opt).value_or(y) == 3); |
| assert(!opt); |
| } |
| { |
| optional<X> opt; |
| assert(std::move(opt).value_or(Y(3)) == 4); |
| assert(!opt); |
| } |
| #endif // _LIBCPP_STD_VER > 11 |
| } |