tracked_value.h
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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
//
//===----------------------------------------------------------------------===//
#ifndef SUPPORT_TRACKED_VALUE_H
#define SUPPORT_TRACKED_VALUE_H
#include <cassert>
#include "test_macros.h"
struct TrackedValue {
enum State { CONSTRUCTED, MOVED_FROM, DESTROYED };
State state;
TrackedValue() : state(State::CONSTRUCTED) {}
TrackedValue(TrackedValue const& t) : state(State::CONSTRUCTED) {
assert(t.state != State::MOVED_FROM && "copying a moved-from object");
assert(t.state != State::DESTROYED && "copying a destroyed object");
}
#if TEST_STD_VER >= 11
TrackedValue(TrackedValue&& t) : state(State::CONSTRUCTED) {
assert(t.state != State::MOVED_FROM && "double moving from an object");
assert(t.state != State::DESTROYED && "moving from a destroyed object");
t.state = State::MOVED_FROM;
}
#endif
TrackedValue& operator=(TrackedValue const& t) {
assert(state != State::DESTROYED && "copy assigning into destroyed object");
assert(t.state != State::MOVED_FROM && "copying a moved-from object");
assert(t.state != State::DESTROYED && "copying a destroyed object");
state = t.state;
return *this;
}
#if TEST_STD_VER >= 11
TrackedValue& operator=(TrackedValue&& t) {
assert(state != State::DESTROYED && "move assigning into destroyed object");
assert(t.state != State::MOVED_FROM && "double moving from an object");
assert(t.state != State::DESTROYED && "moving from a destroyed object");
state = t.state;
t.state = State::MOVED_FROM;
return *this;
}
#endif
~TrackedValue() {
assert(state != State::DESTROYED && "double-destroying an object");
state = State::DESTROYED;
}
};
#endif // SUPPORT_TRACKED_VALUE_H