Method pop_front

fdbserver/DiskQueue.actor.cpp:75–80

		return p;
	}
	StringRef pop_front(int bytes) {
		ASSERT(bytes <= str.size());
		StringRef result = str.substr(0, bytes);
		str.contents() = str.substr(bytes);
		return result;
	}
	void alignReserve(int alignment, int size) {
		ASSERT(alignment && (alignment & (alignment - 1)) == 0); // alignment is a power of two