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templated function not working

Started by nlbs Dec 17, 2008 at 10:27 AM 4 replies 700+ views

Original Post

Dec 17, 2008 at 10:27 AM

template <class KeyT , class ValT>
inline QMap<KeyT, ValT>::const_iterator incrementIterator(const QMap<KeyT, ValT>::const_iterator& it, const QMap<KeyT, ValT>::const_iterator& endItr, int i){
	int itr = 0;
	while(it != endItr || itr++ <= i)++it;
	return it;
}

Why the above code doesn't compile and fires compilation error.

expected initializer before ‘incrementIterator’

phresnel

Dec 17, 2008 at 10:40 AM

a) Could you please post more context?
b) Could you please reformat your code, say, with 1 expression per line?
c) Could you please post the complete error-log?

visitor

Dec 17, 2008 at 10:45 AM

Whenever you have a nested type within a template class like this:

template <class KeyT , class ValT>inline QMap<KeyT, ValT>::const_iterator ...

the typename keyword is mandatory in front of QMap to tell that what follows is a type (and not for example a static member - the compiler shouldn't need to wait until QMap is instantiated to find that out), except with VC++.

SiCrane

Dec 17, 2008 at 10:45 AM

You probably want:
inline typename QMap::const_iterator incrementIterator(const typename QMap::const_iterator& it, const typename QMap::const_iterator& endItr, int i){

plastique

Dec 17, 2008 at 10:46 AM

My bet would be that the compiler misses a "typename" keyword in front of the "QMap::const_iterator" and is unsure what to make of it.

nlbs

Dec 17, 2008 at 11:10 AM

I did also put typename in argument list and return type however I wrongly put it before const which did not worked now when I put it after const it worked.Thanks

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