swap.pass.cpp
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14
// <optional>
// void swap(optional&)
// noexcept(is_nothrow_move_constructible<T>::value &&
// is_nothrow_swappable<T>::value)
#include <optional>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
#include "archetypes.h"
using std::optional;
class X
{
int i_;
public:
static unsigned dtor_called;
X(int i) : i_(i) {}
X(X&& x) = default;
X& operator=(X&&) = default;
~X() {++dtor_called;}
friend bool operator==(const X& x, const X& y) {return x.i_ == y.i_;}
};
unsigned X::dtor_called = 0;
class Y
{
int i_;
public:
static unsigned dtor_called;
Y(int i) : i_(i) {}
Y(Y&&) = default;
~Y() {++dtor_called;}
friend constexpr bool operator==(const Y& x, const Y& y) {return x.i_ == y.i_;}
friend void swap(Y& x, Y& y) {std::swap(x.i_, y.i_);}
};
unsigned Y::dtor_called = 0;
class Z
{
int i_;
public:
Z(int i) : i_(i) {}
Z(Z&&) {TEST_THROW(7);}
friend constexpr bool operator==(const Z& x, const Z& y) {return x.i_ == y.i_;}
friend void swap(Z&, Z&) {TEST_THROW(6);}
};
int main(int, char**)
{
{
optional<int> opt1;
optional<int> opt2;
static_assert(noexcept(opt1.swap(opt2)) == true, "");
assert(static_cast<bool>(opt1) == false);
assert(static_cast<bool>(opt2) == false);
opt1.swap(opt2);
assert(static_cast<bool>(opt1) == false);
assert(static_cast<bool>(opt2) == false);
}
{
optional<int> opt1(1);
optional<int> opt2;
static_assert(noexcept(opt1.swap(opt2)) == true, "");
assert(static_cast<bool>(opt1) == true);
assert(*opt1 == 1);
assert(static_cast<bool>(opt2) == false);
opt1.swap(opt2);
assert(static_cast<bool>(opt1) == false);
assert(static_cast<bool>(opt2) == true);
assert(*opt2 == 1);
}
{
optional<int> opt1;
optional<int> opt2(2);
static_assert(noexcept(opt1.swap(opt2)) == true, "");
assert(static_cast<bool>(opt1) == false);
assert(static_cast<bool>(opt2) == true);
assert(*opt2 == 2);
opt1.swap(opt2);
assert(static_cast<bool>(opt1) == true);
assert(*opt1 == 2);
assert(static_cast<bool>(opt2) == false);
}
{
optional<int> opt1(1);
optional<int> opt2(2);
static_assert(noexcept(opt1.swap(opt2)) == true, "");
assert(static_cast<bool>(opt1) == true);
assert(*opt1 == 1);
assert(static_cast<bool>(opt2) == true);
assert(*opt2 == 2);
opt1.swap(opt2);
assert(static_cast<bool>(opt1) == true);
assert(*opt1 == 2);
assert(static_cast<bool>(opt2) == true);
assert(*opt2 == 1);
}
{
optional<X> opt1;
optional<X> opt2;
static_assert(noexcept(opt1.swap(opt2)) == true, "");
assert(static_cast<bool>(opt1) == false);
assert(static_cast<bool>(opt2) == false);
opt1.swap(opt2);
assert(static_cast<bool>(opt1) == false);
assert(static_cast<bool>(opt2) == false);
assert(X::dtor_called == 0);
}
{
optional<X> opt1(1);
optional<X> opt2;
static_assert(noexcept(opt1.swap(opt2)) == true, "");
assert(static_cast<bool>(opt1) == true);
assert(*opt1 == 1);
assert(static_cast<bool>(opt2) == false);
X::dtor_called = 0;
opt1.swap(opt2);
assert(X::dtor_called == 1);
assert(static_cast<bool>(opt1) == false);
assert(static_cast<bool>(opt2) == true);
assert(*opt2 == 1);
}
{
optional<X> opt1;
optional<X> opt2(2);
static_assert(noexcept(opt1.swap(opt2)) == true, "");
assert(static_cast<bool>(opt1) == false);
assert(static_cast<bool>(opt2) == true);
assert(*opt2 == 2);
X::dtor_called = 0;
opt1.swap(opt2);
assert(X::dtor_called == 1);
assert(static_cast<bool>(opt1) == true);
assert(*opt1 == 2);
assert(static_cast<bool>(opt2) == false);
}
{
optional<X> opt1(1);
optional<X> opt2(2);
static_assert(noexcept(opt1.swap(opt2)) == true, "");
assert(static_cast<bool>(opt1) == true);
assert(*opt1 == 1);
assert(static_cast<bool>(opt2) == true);
assert(*opt2 == 2);
X::dtor_called = 0;
opt1.swap(opt2);
assert(X::dtor_called == 1); // from inside std::swap
assert(static_cast<bool>(opt1) == true);
assert(*opt1 == 2);
assert(static_cast<bool>(opt2) == true);
assert(*opt2 == 1);
}
{
optional<Y> opt1;
optional<Y> opt2;
static_assert(noexcept(opt1.swap(opt2)) == false, "");
assert(static_cast<bool>(opt1) == false);
assert(static_cast<bool>(opt2) == false);
opt1.swap(opt2);
assert(static_cast<bool>(opt1) == false);
assert(static_cast<bool>(opt2) == false);
assert(Y::dtor_called == 0);
}
{
optional<Y> opt1(1);
optional<Y> opt2;
static_assert(noexcept(opt1.swap(opt2)) == false, "");
assert(static_cast<bool>(opt1) == true);
assert(*opt1 == 1);
assert(static_cast<bool>(opt2) == false);
Y::dtor_called = 0;
opt1.swap(opt2);
assert(Y::dtor_called == 1);
assert(static_cast<bool>(opt1) == false);
assert(static_cast<bool>(opt2) == true);
assert(*opt2 == 1);
}
{
optional<Y> opt1;
optional<Y> opt2(2);
static_assert(noexcept(opt1.swap(opt2)) == false, "");
assert(static_cast<bool>(opt1) == false);
assert(static_cast<bool>(opt2) == true);
assert(*opt2 == 2);
Y::dtor_called = 0;
opt1.swap(opt2);
assert(Y::dtor_called == 1);
assert(static_cast<bool>(opt1) == true);
assert(*opt1 == 2);
assert(static_cast<bool>(opt2) == false);
}
{
optional<Y> opt1(1);
optional<Y> opt2(2);
static_assert(noexcept(opt1.swap(opt2)) == false, "");
assert(static_cast<bool>(opt1) == true);
assert(*opt1 == 1);
assert(static_cast<bool>(opt2) == true);
assert(*opt2 == 2);
Y::dtor_called = 0;
opt1.swap(opt2);
assert(Y::dtor_called == 0);
assert(static_cast<bool>(opt1) == true);
assert(*opt1 == 2);
assert(static_cast<bool>(opt2) == true);
assert(*opt2 == 1);
}
{
optional<Z> opt1;
optional<Z> opt2;
static_assert(noexcept(opt1.swap(opt2)) == false, "");
assert(static_cast<bool>(opt1) == false);
assert(static_cast<bool>(opt2) == false);
opt1.swap(opt2);
assert(static_cast<bool>(opt1) == false);
assert(static_cast<bool>(opt2) == false);
}
#ifndef TEST_HAS_NO_EXCEPTIONS
{
optional<Z> opt1;
opt1.emplace(1);
optional<Z> opt2;
static_assert(noexcept(opt1.swap(opt2)) == false, "");
assert(static_cast<bool>(opt1) == true);
assert(*opt1 == 1);
assert(static_cast<bool>(opt2) == false);
try
{
opt1.swap(opt2);
assert(false);
}
catch (int i)
{
assert(i == 7);
}
assert(static_cast<bool>(opt1) == true);
assert(*opt1 == 1);
assert(static_cast<bool>(opt2) == false);
}
{
optional<Z> opt1;
optional<Z> opt2;
opt2.emplace(2);
static_assert(noexcept(opt1.swap(opt2)) == false, "");
assert(static_cast<bool>(opt1) == false);
assert(static_cast<bool>(opt2) == true);
assert(*opt2 == 2);
try
{
opt1.swap(opt2);
assert(false);
}
catch (int i)
{
assert(i == 7);
}
assert(static_cast<bool>(opt1) == false);
assert(static_cast<bool>(opt2) == true);
assert(*opt2 == 2);
}
{
optional<Z> opt1;
opt1.emplace(1);
optional<Z> opt2;
opt2.emplace(2);
static_assert(noexcept(opt1.swap(opt2)) == false, "");
assert(static_cast<bool>(opt1) == true);
assert(*opt1 == 1);
assert(static_cast<bool>(opt2) == true);
assert(*opt2 == 2);
try
{
opt1.swap(opt2);
assert(false);
}
catch (int i)
{
assert(i == 6);
}
assert(static_cast<bool>(opt1) == true);
assert(*opt1 == 1);
assert(static_cast<bool>(opt2) == true);
assert(*opt2 == 2);
}
#endif
return 0;
}