2012/10/26 Daniel James <dnljms@gmail.com>

On 26 October 2012 19:41, weiqingh <weiqingh@mail.com> wrote:
> hi there,
>
> I would like to use boost preprocessor to generate something like this: (for
> n from 0 to N with n = 2 in the following example)
>
> template <typename T1, typename T2>
> void foo(T1 t1, T2 t2)
>
> I have tried to use BOOST_PP_ENUM_PARAMS but cannot figure out how to get
> both T_i and t_i changed each time. is there some other macros I can use?
> any help is highly appreciated.

You want BOOST_PP_ENUM_BINARY_PARAMS.

Here's my shot at the this, *not* tested:

 

#define FOO( n ) \

  BOOST_PP_EXPR_IF( N, template < ) \

  BOOST_PP_ENUM_PARAMS( n, typename T ) \

  void foo( BOOST_PP_ENUM_BINARY_PARAMS( n, T, t) )

HTH, Kris