Re: [Boost-users] boost::parameter -- merging two ArgPacks

Stjepan Rajko wrote:

On Mon, Sep 8, 2008 at 10:36 PM, e r wrote:

...

hello,

here's what i'm looking to do:

template<typename ArgPack> result_type unary_fun(const ArgPack& args){ //typically calls args[some_tag] }

template result_type binary_fun(const ArgPack1& args1,const ArgPack2& args2){ return unary_fun(merge(args1,args2)); }

i'm looking to define merge. not familiar enough with arg_list.hpp any help would be appreciated.

The comma operator will merge two argument packs, but in a function call you have to enclose the comma expression in an extra set of parentheses:

return unary_fun((args1,args2));

HTH,

Stjepan

It sure helps, thanks!