optional& operator=(T* value) {
if (valid())
unchecked_destroy();
if (value == nullptr) {
return *this;
}
unchecked_place(value);
return *this;
}
optional& operator=(optional&& that) {
if (std::addressof(that) == this)
return *this;
if (valid() && that.valid())
**this = std::move(*that);
else if (valid())
unchecked_destroy();
else if (that.valid())
unchecked_place(std::move(*that));
else
present = false;
return *this;
}
optional( T&& t ) {
unchecked_place( std::move( t ) );
}
optional( const T& t ) {
unchecked_place( t );
}
explicit optional( in_place_t, Tn&&... argn ) {
unchecked_place( std::forward<Tn>( argn )... );
}
void place( Tn&&... argn ) {
assert( !present );
unchecked_place( std::forward<Tn>( argn )... );
}
optional& operator=(const T& right) {
if (valid())
unchecked_destroy();
unchecked_place(right);
return *this;
}
optional& operator=(T&& right) {
if (valid())
unchecked_destroy();
unchecked_place(std::move(right));
return *this;
}
optional(optional&& that) : present(false) {
if (that.valid())
unchecked_place(std::move(*that));
}
optional(const optional& that) : present(false) {
if (that.valid())
unchecked_place(*that);
}
optional& operator=(T& value) {
if (valid())
unchecked_destroy();
unchecked_place(value);
return *this;
}
void place(Tn&&... argn) {
assert(!valid());
unchecked_place(std::forward<Tn>(argn)...);
}
