AFAIK, VC7 does not fill in the default argument for templated types.
I remember a solution posted by Dave Abrahams in some(?) forum, wherein he used one of boost library to acheive this, but I don't remember the exact solution and library.
I used an extra level of indirection, but I can not assure you if this is anywhere near standard practices only the gurus can...
Here is what I did:
////////////////////////////////////////////////////////////////
BOOST_MPL_HAS_XXX_TRAIT_DEF(ctype)
///// SomeFunc function///////////////
template <typename T, class Cont>
typename Cont::ctype somefunc(T a, typename p_enable_if<has_ctype<Cont>, typename Cont::ctype > *p =0) {
    Cont::ctype c;
    c.push_back(a);
    return c;
}

//////Container wrap
template <
    typename _elem,

    template<
        typename Elem,
        typename Alloc=std::allocator<Elem>
    >
    class cont,
    typename Alloc=std::allocator<_elem>
>
struct _container {
    typedef cont<_elem,Alloc> ctype;
};

int _tmain(int argc, _TCHAR* argv[]) {
...
std::vector<char> cd = somefoo<char, _container<char,std::vector> >('a');
...
}

On 5/18/06, chun ping wang < cablepuff@gmail.com > wrote:

the error is on "CONT<T> someFunc()"...

On 5/18/06, Michael Rickert < pandamojo@gmail.com> wrote:

DevC++ uses GCC, and 4.0.0 seems to grok that, although I might be instantiating it differently (since you didn't post the line triggering the error).

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