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

Subject: Re: [Boost-users] boost::parameter -- merging two ArgPacks
From: e r (erwann.rogard_at_[hidden])
Date: 2008-09-09 21:19:43

Stjepan Rajko wrote:
> On Mon, Sep 8, 2008 at 10:36 PM, e r <erwann.rogard_at_[hidden]> 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<typename ArgPack1,typename ArgPack2>
>> 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!