STL iterator with custom template

Question

i have the following template method,

template <class T>
void Class::setData( vector<T> data )
{    
    vector<T>::iterator it;
}

and i'm getting the following compilation error ( XCode/gcc )

error: expected `;' before 'it'

i found someone else with a similar problem here (read down to see it's the same even though it starts out with a different issue) but they seem to have resolved by updating Visual Studio. This makes me guess that it is a compiler issue and that it should compile, is that correct? Iteration via indexing from 0 to size works, however it is not the way i would prefer to implement this function. Is there another way around this? Thanks

Note: consider passing in "vector<T> &data", or maybe "vector<T> const &data" not "vector<T> data". The former two will pass in a reference to the vector, the latter will make a full copy of the vector. — Mr Fooz
– Mr Fooz, Commented Feb 27, 2009 at 13:16

dirkgently · Accepted Answer · 2009-02-27 12:53:12Z

10

Classic case of when to use the typename keyword. Hoping that you have #include-ed vector and iterator and have a using namespace std; somewhere in scope. Use:

typename vector<T>::iterator it;

Look up dependent names. Start here.

answered Feb 27, 2009 at 12:53

dirkgently

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Comments

Paolo Tedesco · Accepted Answer · 2009-02-27 12:53:43Z

1

I think you are missing a typename:

#include <vector>
using namespace std;

class Class{
public:
    template <class T>
    void setData( vector<T> data ) {
        typename vector<T>::iterator it;
    }
};

answered Feb 27, 2009 at 12:53

Paolo Tedesco

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Comments

Douglas Leeder · Accepted Answer · 2009-02-27 12:30:44Z

0

Try:

template <class T>
void Class::setData( std::vector<T> data )
{    
    std::vector<T>::iterator it;
}

Just is case it's a missing using statement?

answered Feb 27, 2009 at 12:30

Douglas Leeder

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1 Comment

Paolo Tedesco Over a year ago

If he had missed the using statement he would also get an error on the function signature.

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