How to remove the enclosing parentheses with macro?

#define ESC(...) __VA_ARGS__

then

MY_MACRO( ESC(A<int, double>), text );

might do what you want.

This macro trick is similar to Yakk's solution but removes the need to explicitly pass in another macro as a parameter.

#include <stdio.h>

#define _Args(...) __VA_ARGS__
#define STRIP_PARENS(X) X
#define PASS_PARAMETERS(X) STRIP_PARENS( _Args X )

int main()
{
  printf("without macro %d %d %d %d %d %d\n", (5,6,7,8,9,10) ); // This actually compiles, but it's WRONG
  printf("with macro %d %d %d %d %d %d\n", PASS_PARAMETERS((5,6,7,8,9,10)) ); //Parameter "pack" enclosed in parenthesis
  return 0;
}

Of course you could get creative by making the PASS_PARAMETERS macro into a variadic macro and pass in multiple parameter packs.

A simple hack could be to use variadic macros:

#define MY_MACRO(a, b...)   ...

Then you can use it like:

MY_MACRO(text, A<int, double>)

The comma in the second argument is still interpreted as the argument separator (meaning the macro is actually called with three arguments), but it's expanded inside the macro, making the behavior the same. The variadic argument has to be last in the macro, however.