forked from OSchip/llvm-project
149 lines
3.1 KiB
C++
149 lines
3.1 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <optional>
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// template <class... Args> void optional<T>::emplace(Args&&... args);
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#include <experimental/optional>
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#include <type_traits>
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#include <cassert>
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#include <memory>
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#if _LIBCPP_STD_VER > 11
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using std::experimental::optional;
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class X
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{
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int i_;
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int j_ = 0;
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public:
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X() : i_(0) {}
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X(int i) : i_(i) {}
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X(int i, int j) : i_(i), j_(j) {}
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friend bool operator==(const X& x, const X& y)
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{return x.i_ == y.i_ && x.j_ == y.j_;}
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};
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class Y
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{
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public:
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static bool dtor_called;
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Y() = default;
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~Y() {dtor_called = true;}
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};
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bool Y::dtor_called = false;
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class Z
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{
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public:
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static bool dtor_called;
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Z() = default;
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Z(int) {throw 6;}
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~Z() {dtor_called = true;}
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};
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bool Z::dtor_called = false;
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#endif // _LIBCPP_STD_VER > 11
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int main()
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{
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#if _LIBCPP_STD_VER > 11
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{
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optional<int> opt;
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opt.emplace();
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assert(static_cast<bool>(opt) == true);
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assert(*opt == 0);
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}
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{
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optional<int> opt;
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opt.emplace(1);
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assert(static_cast<bool>(opt) == true);
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assert(*opt == 1);
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}
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{
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optional<int> opt(2);
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opt.emplace();
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assert(static_cast<bool>(opt) == true);
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assert(*opt == 0);
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}
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{
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optional<int> opt(2);
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opt.emplace(1);
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assert(static_cast<bool>(opt) == true);
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assert(*opt == 1);
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}
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{
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optional<X> opt;
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opt.emplace();
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assert(static_cast<bool>(opt) == true);
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assert(*opt == X());
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}
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{
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optional<X> opt;
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opt.emplace(1);
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assert(static_cast<bool>(opt) == true);
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assert(*opt == X(1));
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}
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{
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optional<X> opt;
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opt.emplace(1, 2);
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assert(static_cast<bool>(opt) == true);
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assert(*opt == X(1, 2));
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}
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{
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optional<X> opt(X{3});
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opt.emplace();
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assert(static_cast<bool>(opt) == true);
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assert(*opt == X());
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}
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{
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optional<X> opt(X{3});
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opt.emplace(1);
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assert(static_cast<bool>(opt) == true);
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assert(*opt == X(1));
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}
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{
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optional<X> opt(X{3});
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opt.emplace(1, 2);
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assert(static_cast<bool>(opt) == true);
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assert(*opt == X(1, 2));
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}
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{
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Y y;
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{
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optional<Y> opt(y);
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assert(Y::dtor_called == false);
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opt.emplace();
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assert(Y::dtor_called == true);
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}
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}
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{
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Z z;
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optional<Z> opt(z);
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try
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{
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assert(static_cast<bool>(opt) == true);
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assert(Z::dtor_called == false);
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opt.emplace(1);
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}
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catch (int i)
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{
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assert(i == 6);
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assert(static_cast<bool>(opt) == false);
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assert(Z::dtor_called == true);
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}
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}
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#endif // _LIBCPP_STD_VER > 11
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}
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