Re: gcc 4.1.2 bug?

From:
"Maxim Yegorushkin" <maxim.yegorushkin@gmail.com>
Newsgroups:
comp.lang.c++.moderated
Date:
8 Nov 2006 07:17:00 -0500
Message-ID:
<1162987103.141472.273530@k70g2000cwa.googlegroups.com>
Tarjan Denes wrote:

Hi,

We've encountered a problem using g++ compiler version 4.1.2 (that was the
latest we downloaded). Seems like a bug, but we're not sure. We didn't
find any related problem in the gcc mailing list.

Here is a simplified code that causes the problem:


[]

template<typename A> class Attr
{
public:
     template <typename T, int v> class i_record_descriptor
     {
     public:
         void operator()()
         {
             printf("Inner template\n");
         }
     };
     template <int v> class i_record_descriptor<A, v>
     {
     public:
         void operator()()
         {
             printf("Inner spec template\n");
         }
     };
     Attr()
     {
         TableRecord<A, 1, i_record_descriptor> tr;
     }
};
int main()
{
     Attr<int> attr;
     return 0;
}


[]

It compiles fine, but the result after running the executable is "Inner
template" instead of "Inner spec template".

Can somebody help us to find out what is wrong?


The code is wrong. The standard does not allow specializing enclosed
templates within the declaration of the enclosing class. Some compilers
(ms ones) allow that as an extension.

To fix, declare i_record_descriptor<> primary template and its
specializations outside of class Attr.

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