Function xpath_string

Tools/EditorFramework/pugixml.cpp:6559–6565

	}

	explicit xpath_string(const char_t* str, xpath_allocator* alloc)
	{
		bool empty_ = (*str == 0);

		_buffer = empty_ ? PUGIXML_TEXT("") : duplicate_string(str, alloc);
		_uses_heap = !empty_;
	}

	explicit xpath_string(const char_t* str, bool use_heap) :
		_buffer(str),