STL custom mem_fun

[Maitre Bart]

First, I describe my setup in 3 points. Then I describe what I want to do,
and describe the error I get.

1) I have a container GTTable container pointer to data (class GT *).

2) I made a template class based on mem_fun1, which in my version accepts 2
arguments in each call: one that is variable on each call (VA, typically
coming from the above container) and one that is fixed on each call (FA,
kind of constant provided by the user):

template<class R, class T, class VA, class FA>
class mem_fun1_arg_t : binary_function <T*, VA, R>
{
public:
explicit mem_fun1_arg_t( R (T::*p)(VA va, FA fa), FA fa) : pmf(p),
arg(fa) {}
R operator()(T* p, VA va) const {return (p->*pmf)(va, arg);}
private:
R (T::*pmf)(VA va, FA fa);
FA arg;
};

3) I paired the above template class with the following template function:

template<class R, class T, class VA, class FA>
inline static mem_fun1_arg_t< R, T, VA, FA> mem_fun1_arg(R (T::*p)(VA va, FA
fa), FA fa)
{
return mem_fun1_arg_t< R, T, VA, FA>(p, fa);
}

What I want to do is to find an element in GTTable that matches another
object's predicate, while providing a constant as the second argument during
the calls. Each call within the STL algorithm should look like:

ptrObject->Pred2(ptrGT, k)

Given ptrObject is of type "class CSomeClass", I use:

find_if(GTTable->begin(),
GTTable->end(),
bind1st(mem_fun 1_arg(&CSomeCla ss::Pred2, k), ptrObject));

However, the compiler keeps complaining the same 7 errors in a row:

c:\program files\microsoft visual studio\vc98\inc lude\functional (158): error
C2248: 'first_argument _type': cannot access public typedef declared in class
'binary_functio n<CSomeClass *,GT const *,bool>'
c:\program files\microsoft visual studio\vc98\inc lude\functional (24): see
declaration of 'first_argument _type'
GTManager.cpp(3 96): see reference to class template instantiation
'binder1st<mem_ fun1_arg_t<bool ,CSomeClass,GT const *,int>>' being compiled

I tried another test with the standard mem_fun1 (derived from
binary_function ) in order to verify if it was compiling:

find_if(GTTable->begin(),
GTTable->end(),
bind1st(mem_fun 1(&CSomeClass:: Pred1), ptrObject));

and it works (the compiler does not display any error message).

I wonder what is wrong in my template pair?
Is it my compiler? (MSVS6)

Note: I have the equivalent templates, adapted for unary_function, and there
no error.

Thanks for any help.

[David Harmon]

On Tue, 10 Feb 2004 10:54:18 -0500 in comp.lang.c++, "Maitre Bart"
<le*****@cae.co m> was alleged to have written:

template<cla ss R, class T, class VA, class FA>
class mem_fun1_arg_t : binary_function <T*, VA, R>

Try:
class mem_fun1_arg_t : public binary_function <T*, VA, R>
~~~~~~

[Maitre Bart]

"David Harmon" <so****@netcom. com> wrote in message
news:40******** *******@news.we st.earthlink.ne t...

On Tue, 10 Feb 2004 10:54:18 -0500 in comp.lang.c++, "Maitre Bart"
<le*****@cae.co m> was alleged to have written:

template<cla ss R, class T, class VA, class FA>
class mem_fun1_arg_t : binary_function <T*, VA, R>

Try:
class mem_fun1_arg_t : public binary_function <T*, VA, R>
~~~~~~

....

Thanks!