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