template<class... _Valty>
	void emplace_back(_Valty&&... _Val)
	{	// insert by moving into element at end
	if (this->_Mylast == this->_Myend)
		_Reserve(1);
	_Orphan_range(this->_Mylast, this->_Mylast);
	this->_Getal().construct(this->_Mylast,
		_STD forward<_Valty>(_Val)...);
	++this->_Mylast;
	}