Method readNextPage

fdbserver/DiskQueue.actor.cpp:227–227

	// FIXME: let the caller pass in where to write the data.
	Future<Standalone<StringRef>> read(int file, int page, int nPages) { return read(this, file, page, nPages); }
	Future<Standalone<StringRef>> readNextPage() { return readNextPage(this); }
	Future<Void> truncateBeforeLastReadPage() { return truncateBeforeLastReadPage(this); }

	Future<Void> getError() { return onError; }