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#ifndef SUPPORT_TRACKED_VALUE_H
#define SUPPORT_TRACKED_VALUE_H
#include <cassert>
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");
}
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
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;
}
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
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
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