The most common use case for QTextStream::readLine() is reading
a file line by line in a loop. The existing readLine() method
allocates new memory for each line, that results in a loss of
speed. The introduced overload can use already allocated memory.
Besides it allows you to not think about filesystem specifics.
The current QFile documentation suggests a separate way to read
files from /proc filesystem. With this overload it's possible
to use the same idiom in all cases:
QTextStream in(&file);
QString line;
while (in.readLine(&line)) {
process_line(line);
}
The idea was inspired by the blog post of Ivan Čukić:
http://ivan.fomentgroup.org/blog/2014/10/03/api-design-and-impact-on-the-performance-qt-vs-stl-example/
Change-Id: I0c62b4a52681870589bc099905e83ed69e03dd40
Reviewed-by: Martin Smith <martin.smith@digia.com>
Reviewed-by: David Faure <david.faure@kdab.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
de71c8a6f8