Re: [Boost-users] How to use mpl::count and function_types

Subject: Re: [Boost-users] How to use mpl::count and function_types
From: Allan Nielsen (a_at_[hidden])
Date: 2011-11-24 03:08:06

Ahh.. thanks

On Fri, Nov 25, 2011 at 8:40 AM, Steven Watanabe <watanabesj_at_[hidden]> wrote:
> AMDG
>
> On 11/23/2011 09:29 AM, Allan Nielsen wrote:
>> I'm trying to count the number of parameters in a function-type:
>>
>> Â  Â  cout << boost::mpl::count< boost::function_types::parameter_types<
>> void() > >::value << endl;
>> Â  Â  cout << boost::mpl::count< boost::function_types::parameter_types<
>> void(int) > >::value << endl;
>> Â  Â  cout << boost::mpl::count< boost::function_types::parameter_types<
>> void(int, int) > >::value << endl;
>>
>> This prints:
>> 0
>> 0
>> 0
>>
>> I would have expected:
>> 0
>> 1
>> 2
>>
>> What have I done wrong?
>>
>
> What you want is mpl::size. Â mpl::count
> takes two arguments and return the
> number of elements equal to the second
> argument (like std::count).
>
> In Christ,
> Steven Watanabe
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