On Fri, Oct 26, 2012 at 11:41 AM, weiqingh <weiqingh@mail.com> wrote:
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.
I haven't tried this code but something like this should work: #include <boost/preprocessor.hpp> #define TPARAM(z, m, unused) typename BOOST_PP_CAT(T, m) #define PARAM(z, m, unused) BOOST_PP_CAT(T, m) BOOST_PP_CAT(t, m) #define FOO(z, n, unused) \ BOOST_PP_EXPR_IF(n, template<) \ BOOST_PP_ENUM_ ## z(n, TPARAM, ~) \ BOOST_PP_EXPR_IF(n, >) \ void foo ( BOOST_PP_ENUM_ ## z(n, PARAM, ~) ) BOOST_PP_REPEAT(2, FOO, ~) Compile it with -E -P (GCC), /EP (MSVC), etc to so see the pp output. HTH, --Lorenzo