C ++ ifstream.getline（）明显慢于Java的BufferedReader.readLine（）？

I'm in the process of rewriting one of my Android applications to take advantage of the NDK and one of the first things it has to do every time is open a 1.5MB text file (approximately 150k lines) and put every line in a data structure. When I did this operation using Java's BufferedReader.readLine(), reading the file from the SD card takes ~2.5 seconds. Here's the code I used for this:I'm in the process of rewriting one of my Andro