330 lines
9.3 KiB
C++
330 lines
9.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14
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// UNSUPPORTED: gcc-10
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// <optional>
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// void swap(optional&)
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// noexcept(is_nothrow_move_constructible<T>::value &&
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// is_nothrow_swappable<T>::value)
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#include <optional>
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#include <type_traits>
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#include <cassert>
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#include "test_macros.h"
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#include "archetypes.h"
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using std::optional;
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class X
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{
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int i_;
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public:
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static unsigned dtor_called;
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X(int i) : i_(i) {}
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X(X&& x) = default;
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X& operator=(X&&) = default;
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~X() {++dtor_called;}
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friend bool operator==(const X& x, const X& y) {return x.i_ == y.i_;}
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};
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unsigned X::dtor_called = 0;
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class Y
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{
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int i_;
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public:
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static unsigned dtor_called;
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Y(int i) : i_(i) {}
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Y(Y&&) = default;
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~Y() {++dtor_called;}
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friend constexpr bool operator==(const Y& x, const Y& y) {return x.i_ == y.i_;}
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friend void swap(Y& x, Y& y) {std::swap(x.i_, y.i_);}
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};
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unsigned Y::dtor_called = 0;
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class Z
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{
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int i_;
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public:
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Z(int i) : i_(i) {}
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Z(Z&&) {TEST_THROW(7);}
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friend constexpr bool operator==(const Z& x, const Z& y) {return x.i_ == y.i_;}
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friend void swap(Z&, Z&) {TEST_THROW(6);}
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};
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class W
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{
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int i_;
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public:
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constexpr W(int i) : i_(i) {}
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friend constexpr bool operator==(const W& x, const W& y) {return x.i_ == y.i_;}
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friend TEST_CONSTEXPR_CXX20 void swap(W& x, W& y) noexcept {std::swap(x.i_, y.i_);}
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};
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template<class T>
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TEST_CONSTEXPR_CXX20 bool check_swap()
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{
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{
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optional<T> opt1;
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optional<T> opt2;
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static_assert(noexcept(opt1.swap(opt2)) == true);
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assert(static_cast<bool>(opt1) == false);
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assert(static_cast<bool>(opt2) == false);
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opt1.swap(opt2);
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assert(static_cast<bool>(opt1) == false);
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assert(static_cast<bool>(opt2) == false);
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}
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{
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optional<T> opt1(1);
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optional<T> opt2;
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static_assert(noexcept(opt1.swap(opt2)) == true);
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assert(static_cast<bool>(opt1) == true);
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assert(*opt1 == 1);
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assert(static_cast<bool>(opt2) == false);
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opt1.swap(opt2);
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assert(static_cast<bool>(opt1) == false);
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assert(static_cast<bool>(opt2) == true);
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assert(*opt2 == 1);
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}
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{
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optional<T> opt1;
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optional<T> opt2(2);
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static_assert(noexcept(opt1.swap(opt2)) == true, "");
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assert(static_cast<bool>(opt1) == false);
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assert(static_cast<bool>(opt2) == true);
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assert(*opt2 == 2);
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opt1.swap(opt2);
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assert(static_cast<bool>(opt1) == true);
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assert(*opt1 == 2);
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assert(static_cast<bool>(opt2) == false);
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}
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{
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optional<T> opt1(1);
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optional<T> opt2(2);
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static_assert(noexcept(opt1.swap(opt2)) == true, "");
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assert(static_cast<bool>(opt1) == true);
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assert(*opt1 == 1);
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assert(static_cast<bool>(opt2) == true);
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assert(*opt2 == 2);
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opt1.swap(opt2);
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assert(static_cast<bool>(opt1) == true);
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assert(*opt1 == 2);
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assert(static_cast<bool>(opt2) == true);
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assert(*opt2 == 1);
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}
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return true;
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}
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int main(int, char**)
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{
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check_swap<int>();
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check_swap<W>();
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#if TEST_STD_VER > 17
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static_assert(check_swap<int>());
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static_assert(check_swap<W>());
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#endif
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{
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optional<X> opt1;
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optional<X> opt2;
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static_assert(noexcept(opt1.swap(opt2)) == true, "");
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assert(static_cast<bool>(opt1) == false);
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assert(static_cast<bool>(opt2) == false);
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opt1.swap(opt2);
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assert(static_cast<bool>(opt1) == false);
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assert(static_cast<bool>(opt2) == false);
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assert(X::dtor_called == 0);
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}
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{
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optional<X> opt1(1);
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optional<X> opt2;
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static_assert(noexcept(opt1.swap(opt2)) == true, "");
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assert(static_cast<bool>(opt1) == true);
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assert(*opt1 == 1);
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assert(static_cast<bool>(opt2) == false);
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X::dtor_called = 0;
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opt1.swap(opt2);
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assert(X::dtor_called == 1);
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assert(static_cast<bool>(opt1) == false);
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assert(static_cast<bool>(opt2) == true);
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assert(*opt2 == 1);
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}
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{
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optional<X> opt1;
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optional<X> opt2(2);
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static_assert(noexcept(opt1.swap(opt2)) == true, "");
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assert(static_cast<bool>(opt1) == false);
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assert(static_cast<bool>(opt2) == true);
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assert(*opt2 == 2);
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X::dtor_called = 0;
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opt1.swap(opt2);
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assert(X::dtor_called == 1);
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assert(static_cast<bool>(opt1) == true);
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assert(*opt1 == 2);
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assert(static_cast<bool>(opt2) == false);
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}
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{
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optional<X> opt1(1);
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optional<X> opt2(2);
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static_assert(noexcept(opt1.swap(opt2)) == true, "");
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assert(static_cast<bool>(opt1) == true);
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assert(*opt1 == 1);
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assert(static_cast<bool>(opt2) == true);
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assert(*opt2 == 2);
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X::dtor_called = 0;
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opt1.swap(opt2);
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assert(X::dtor_called == 1); // from inside std::swap
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assert(static_cast<bool>(opt1) == true);
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assert(*opt1 == 2);
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assert(static_cast<bool>(opt2) == true);
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assert(*opt2 == 1);
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}
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{
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optional<Y> opt1;
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optional<Y> opt2;
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static_assert(noexcept(opt1.swap(opt2)) == false, "");
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assert(static_cast<bool>(opt1) == false);
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assert(static_cast<bool>(opt2) == false);
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opt1.swap(opt2);
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assert(static_cast<bool>(opt1) == false);
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assert(static_cast<bool>(opt2) == false);
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assert(Y::dtor_called == 0);
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}
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{
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optional<Y> opt1(1);
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optional<Y> opt2;
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static_assert(noexcept(opt1.swap(opt2)) == false, "");
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assert(static_cast<bool>(opt1) == true);
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assert(*opt1 == 1);
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assert(static_cast<bool>(opt2) == false);
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Y::dtor_called = 0;
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opt1.swap(opt2);
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assert(Y::dtor_called == 1);
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assert(static_cast<bool>(opt1) == false);
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assert(static_cast<bool>(opt2) == true);
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assert(*opt2 == 1);
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}
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{
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optional<Y> opt1;
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optional<Y> opt2(2);
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static_assert(noexcept(opt1.swap(opt2)) == false, "");
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assert(static_cast<bool>(opt1) == false);
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assert(static_cast<bool>(opt2) == true);
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assert(*opt2 == 2);
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Y::dtor_called = 0;
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opt1.swap(opt2);
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assert(Y::dtor_called == 1);
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assert(static_cast<bool>(opt1) == true);
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assert(*opt1 == 2);
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assert(static_cast<bool>(opt2) == false);
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}
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{
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optional<Y> opt1(1);
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optional<Y> opt2(2);
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static_assert(noexcept(opt1.swap(opt2)) == false, "");
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assert(static_cast<bool>(opt1) == true);
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assert(*opt1 == 1);
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assert(static_cast<bool>(opt2) == true);
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assert(*opt2 == 2);
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Y::dtor_called = 0;
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opt1.swap(opt2);
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assert(Y::dtor_called == 0);
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assert(static_cast<bool>(opt1) == true);
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assert(*opt1 == 2);
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assert(static_cast<bool>(opt2) == true);
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assert(*opt2 == 1);
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}
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{
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optional<Z> opt1;
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optional<Z> opt2;
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static_assert(noexcept(opt1.swap(opt2)) == false, "");
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assert(static_cast<bool>(opt1) == false);
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assert(static_cast<bool>(opt2) == false);
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opt1.swap(opt2);
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assert(static_cast<bool>(opt1) == false);
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assert(static_cast<bool>(opt2) == false);
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}
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#ifndef TEST_HAS_NO_EXCEPTIONS
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{
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optional<Z> opt1;
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opt1.emplace(1);
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optional<Z> opt2;
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static_assert(noexcept(opt1.swap(opt2)) == false, "");
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assert(static_cast<bool>(opt1) == true);
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assert(*opt1 == 1);
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assert(static_cast<bool>(opt2) == false);
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try
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{
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opt1.swap(opt2);
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assert(false);
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}
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catch (int i)
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{
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assert(i == 7);
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}
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assert(static_cast<bool>(opt1) == true);
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assert(*opt1 == 1);
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assert(static_cast<bool>(opt2) == false);
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}
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{
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optional<Z> opt1;
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optional<Z> opt2;
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opt2.emplace(2);
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static_assert(noexcept(opt1.swap(opt2)) == false, "");
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assert(static_cast<bool>(opt1) == false);
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assert(static_cast<bool>(opt2) == true);
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assert(*opt2 == 2);
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try
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{
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opt1.swap(opt2);
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assert(false);
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}
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catch (int i)
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{
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assert(i == 7);
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}
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assert(static_cast<bool>(opt1) == false);
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assert(static_cast<bool>(opt2) == true);
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assert(*opt2 == 2);
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}
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{
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optional<Z> opt1;
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opt1.emplace(1);
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optional<Z> opt2;
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opt2.emplace(2);
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static_assert(noexcept(opt1.swap(opt2)) == false, "");
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assert(static_cast<bool>(opt1) == true);
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assert(*opt1 == 1);
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assert(static_cast<bool>(opt2) == true);
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assert(*opt2 == 2);
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try
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{
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opt1.swap(opt2);
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assert(false);
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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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}
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assert(static_cast<bool>(opt1) == true);
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assert(*opt1 == 1);
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assert(static_cast<bool>(opt2) == true);
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assert(*opt2 == 2);
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}
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#endif
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return 0;
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}
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