[Development] Fwd: QTextStream::readLine(0) is an ambiguous overload in 5.5

Andreas Aardal Hanssen andreas at hanssen.name
Mon May 18 15:30:26 CEST 2015

2015-05-18 14:56 GMT+02:00 Alejandro Exojo <suy at badopi.org>:

> El Monday 18 May 2015, Smith Martin escribió:
> > You omitted that toInt(&ok) is required to test ok for null, which is not
> > required if ok is a reference.
> That's extra work in the implementation in order support a nicer API to the
> users, e.g. to support toInt() with the null value as default argument, in
> addition to the "passing a pointer makes clear that the value could be
> modified".

Very true! In fact the "opposite API" to toInt() was chosen in
QIODevice::getChar() to ensure that even the extra line of testing for OK
on the client side could be eliminated. For toInt(), it's rare that the
output arg needs to be tested, but for QIODevice::getChar(), it's the

char ch;
if (device->getChar(&ch)) {
    // foo


Imagine reading code like this:

char ch;
if (device->getChar(ch)) {
    // foo, wtf is ch for??

Andreas :-)
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