Troubles when using STL iterator

[Michael]

Hi newsgroup,

the following code cannot be compiled and used on my system.

------------- CUT HERE -------------
#ifndef MYCLASS_H_
#define MYCLASS_H_

#include <iostream>
#include <vector>

class myclass
{
template<typename T>
void f(const std::vector<T> &p)
{
std::vector<T>::const_iterator iter = p.begin();
....
....
....
}
};

#endif /*MYCLASS_H_*/

------------- CUT HERE -------------

When i try to compile it on my system, the compiler reports the following
error message: expected ';' before 'iter'.

On the other hand, when i try to use the class method f() as a normal
function within (lets say) the main.cpp file, the code can be compiled and
executed. But why?

Can someone help me?

Thank you in advance!
Mike

[Ian Collins]

Michael wrote:

Hi newsgroup,

the following code cannot be compiled and used on my system.

------------- CUT HERE -------------
#ifndef MYCLASS_H_
#define MYCLASS_H_

#include <iostream>
#include <vector>

class myclass
{
template<typename T>
void f(const std::vector<T> &p)
{
std::vector<T>::const_iterator iter = p.begin();
....
....
....
}
};

#endif /*MYCLASS_H_*/

------------- CUT HERE -------------

When i try to compile it on my system, the compiler reports the following
error message: expected ';' before 'iter'.

On the other hand, when i try to use the class method f() as a normal
function within (lets say) the main.cpp file, the code can be compiled and
executed. But why?

Your compiler appears to be broken, what is it?

--
Ian Collins.

[Alf P. Steinbach]

* Ian Collins:

* Michael:

template<typename T>
void f(const std::vector<T> &p)
{
std::vector<T>::const_iterator iter = p.begin();
....
....
....
}

When i try to compile it on my system, the compiler reports the following
error message: expected ';' before 'iter'.

On the other hand, when i try to use the class method f() as a normal
function within (lets say) the main.cpp file, the code can be compiled and
executed. But why?

Your compiler appears to be broken, what is it?

It's probably not a broken compiler.

There should be a 'typename' in there:

typename std::vector<T>::const_iterator iter = p.begin();

Otherwise, the compiler has no guarantee that const_iterator is a type
for all possible types T.

--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?

[Roland Pibinger]

On Mon, 01 May 2006 11:37:18 +0200, "Alf P. Steinbach"
<al***@start.no> wrote:

* Ian Collins:

Your compiler appears to be broken, what is it?
It's probably not a broken compiler.

It's probably a broken language :-)
There should be a 'typename' in there:

typename std::vector<T>::const_iterator iter = p.begin();

Otherwise, the compiler has no guarantee that const_iterator is a type
for all possible types T.

See also:
http://womble.decadentplace.org.uk/c...disambiguation

Best regards,
Roland Pibinger

[Ian Collins]

Alf P. Steinbach wrote:

* Ian Collins:

* Michael:

template<typename T>
void f(const std::vector<T> &p)
{
std::vector<T>::const_iterator iter = p.begin();
....
....
....
}

When i try to compile it on my system, the compiler reports the
following
error message: expected ';' before 'iter'.
On the other hand, when i try to use the class method f() as a normal
function within (lets say) the main.cpp file, the code can be
compiled and
executed. But why?

Your compiler appears to be broken, what is it?

It's probably not a broken compiler.

There should be a 'typename' in there:

typename std::vector<T>::const_iterator iter = p.begin();

Otherwise, the compiler has no guarantee that const_iterator is a type
for all possible types T.

True I missed that (as does Sun CC), gcc even tells you where to add the
typename.

Still, the OP's compiler should have given a better error.

--
Ian Collins.

[Michael]

On Mon, 01 May 2006 11:37:18 +0200, Alf P. Steinbach wrote:

* Ian Collins:

* Michael:

template<typename T>
void f(const std::vector<T> &p)
{
std::vector<T>::const_iterator iter = p.begin();
....
....
....
}

When i try to compile it on my system, the compiler reports the following
error message: expected ';' before 'iter'.

On the other hand, when i try to use the class method f() as a normal
function within (lets say) the main.cpp file, the code can be compiled and
executed. But why?

Your compiler appears to be broken, what is it?

It's probably not a broken compiler.

There should be a 'typename' in there:

typename std::vector<T>::const_iterator iter = p.begin();

Otherwise, the compiler has no guarantee that const_iterator is a type
for all possible types T.

Hi

That was the reason: typename was missing ...
Thank you for your help.

Mike