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Patrick Leslie Polzer
Guest
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 Posted: Fri Jan 28, 2005 10:04 am Post subject: Iterator problem with templates |
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Hi,
I have a problem with iterators at compile-time. The following program
will fail to compile:
#include <vector>
using std::vector;
template <typename T>
struct Test
{
};
template <typename T>
struct TestUser
{
vector<Test tests;
void test()
{
vector<Test::const_iterator iter; //line 18
}
};
int main()
{
return(0);
}
because:
tmpltest.cxx:18: error: expected `;' before "iter"
What's that? Is vector<Test::const_iterator an unknown type?
I hope someone can shed some light on this...
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Peter Kragh
Guest
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| Posted: Fri Jan 28, 2005 11:00 am Post subject: Re: Iterator problem with templates |
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Patrick Leslie Polzer wrote:
<snip>
| Quote: | template <typename T
struct TestUser
{
vector tests;
void test()
{
vector<Test::const_iterator iter; //line 18
}
};
snip
What's that? Is vector<Test::const_iterator an unknown type?
|
No. It's not an unknown type. However, it's a so-called dependant name.
Use typename. E.g.
void test()
{
typename vector<Test::const_iterator iter; //line 18
}
That shoule do the trick :-)
HTH
/Peter
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Patrick Leslie Polzer
Guest
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| Posted: Fri Jan 28, 2005 11:27 am Post subject: Re: Iterator problem with templates |
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Peter Kragh wrote:
| Quote: | No. It's not an unknown type. However, it's a so-called dependant name.
Use typename. E.g.
void test()
{
typename vector<Test::const_iterator iter; //line 18
}
That shoule do the trick 
Gah, that hit me a few days ago in another context. |
The error message could really be more helpful :(
Many thanks!
Leslie
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