Re: template specification oddness

"Victor Bazarov" <>
Thu, 21 Feb 2008 14:24:30 -0500
Matthias Buelow wrote:

Hi folks,

I have a weird problem that I can't seem to put my finger on. The
following example program illustrates it:

using namespace std;

template<typename Tval, typename Targ> struct Closure {
   virtual Tval f(Targ arg) = 0;
   virtual ~Closure() = 0;
   // add environment by subclassing

#include <list>

template<typename Targ> struct Hooks {
   std::list<Closure<void, Targ> *> hooks;

   void AddHook(Closure<void, Targ> *cl) { hooks.push_front(cl); }
   void RemoveHook(Closure<void, Targ> *cl) { hooks.remove(cl); }
   void RunHooks(Targ arg) {
       std::list<Closure<void, Targ> *>::const_iterator i =

        typename std::list<Closure<void, Targ> *>::const_iterator i =

       hooks.begin(); for (; i != hooks.end(); i++)

        ... ; ++i)


int main()
   Hooks<bool> h;

   return 0;

When compiling this, g++ (g++ (GCC) 4.1.2 20061115 (prerelease)
(Debian 4.1.1-21)) gives the following error: In member function 'void Hooks<Targ>::RunHooks(Targ)': error: expected `;' before 'i' error: 'i' was not declared in this scope

The Intel compiler, however, compiles it without error (icpc (ICC)
10.1 20070913).

Which compiler is right? Is it a g++ bug?

I don't think so. Intel is often too forgiving.

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