| //===----------------------------------------------------------------------===// |
| // |
| // 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... Args> void optional<T>::emplace(Args&&... args); |
| |
| #include <experimental/optional> |
| #include <type_traits> |
| #include <cassert> |
| #include <memory> |
| |
| #if _LIBCPP_STD_VER > 11 |
| |
| using std::experimental::optional; |
| |
| class X |
| { |
| int i_; |
| int j_ = 0; |
| public: |
| X() : i_(0) {} |
| X(int i) : i_(i) {} |
| X(int i, int j) : i_(i), j_(j) {} |
| |
| friend bool operator==(const X& x, const X& y) |
| {return x.i_ == y.i_ && x.j_ == y.j_;} |
| }; |
| |
| class Y |
| { |
| public: |
| static bool dtor_called; |
| Y() = default; |
| ~Y() {dtor_called = true;} |
| }; |
| |
| bool Y::dtor_called = false; |
| |
| class Z |
| { |
| public: |
| static bool dtor_called; |
| Z() = default; |
| Z(int) {throw 6;} |
| ~Z() {dtor_called = true;} |
| }; |
| |
| bool Z::dtor_called = false; |
| |
| #endif // _LIBCPP_STD_VER > 11 |
| |
| int main() |
| { |
| #if _LIBCPP_STD_VER > 11 |
| { |
| optional<int> opt; |
| opt.emplace(); |
| assert(static_cast<bool>(opt) == true); |
| assert(*opt == 0); |
| } |
| { |
| optional<int> opt; |
| opt.emplace(1); |
| assert(static_cast<bool>(opt) == true); |
| assert(*opt == 1); |
| } |
| { |
| optional<int> opt(2); |
| opt.emplace(); |
| assert(static_cast<bool>(opt) == true); |
| assert(*opt == 0); |
| } |
| { |
| optional<int> opt(2); |
| opt.emplace(1); |
| assert(static_cast<bool>(opt) == true); |
| assert(*opt == 1); |
| } |
| { |
| optional<X> opt; |
| opt.emplace(); |
| assert(static_cast<bool>(opt) == true); |
| assert(*opt == X()); |
| } |
| { |
| optional<X> opt; |
| opt.emplace(1); |
| assert(static_cast<bool>(opt) == true); |
| assert(*opt == X(1)); |
| } |
| { |
| optional<X> opt; |
| opt.emplace(1, 2); |
| assert(static_cast<bool>(opt) == true); |
| assert(*opt == X(1, 2)); |
| } |
| { |
| optional<X> opt(X{3}); |
| opt.emplace(); |
| assert(static_cast<bool>(opt) == true); |
| assert(*opt == X()); |
| } |
| { |
| optional<X> opt(X{3}); |
| opt.emplace(1); |
| assert(static_cast<bool>(opt) == true); |
| assert(*opt == X(1)); |
| } |
| { |
| optional<X> opt(X{3}); |
| opt.emplace(1, 2); |
| assert(static_cast<bool>(opt) == true); |
| assert(*opt == X(1, 2)); |
| } |
| { |
| Y y; |
| { |
| optional<Y> opt(y); |
| assert(Y::dtor_called == false); |
| opt.emplace(); |
| assert(Y::dtor_called == true); |
| } |
| } |
| { |
| Z z; |
| optional<Z> opt(z); |
| try |
| { |
| assert(static_cast<bool>(opt) == true); |
| assert(Z::dtor_called == false); |
| opt.emplace(1); |
| } |
| catch (int i) |
| { |
| assert(i == 6); |
| assert(static_cast<bool>(opt) == false); |
| assert(Z::dtor_called == true); |
| } |
| } |
| #endif // _LIBCPP_STD_VER > 11 |
| } |