Re: [Boost-users] pow math function and bind in boost::lambda

Subject: Re: [Boost-users] pow math function and bind in boost::lambda
From: Conoscenza Silente (abruzzoforteegentile_at_[hidden])
Date: 2009-11-30 06:53:08

Hi Roman
Thank you very much!
I tried to do that previously but without success using the following
statement

boost::lambda::bind< double >( pow, tmp - h - g , 3.15 )

but reading the documentation I realized that it is something that can be
applied only to functors.

Using casting works fine.

Thank you very much
CS

On Mon, Nov 30, 2009 at 12:00 PM, Roman Perepelitsa <
roman.perepelitsa_at_[hidden]> wrote:

> could not deduce template argument for 'overloaded function type' from 'overloaded function type'
>
> That's because function pow is overloaded. You should either explicitly
> cast it (replace pow with static_cast<double (*)(double>(pow)) or create a
> polymorphic function object that calls pow.
>
> Roman Perepelitsa.
>
>
> 2009/11/30 Conoscenza Silente <abruzzoforteegentile_at_[hidden]>
>
>> The problem is that It does't compile.
>> I used MSVC++ Express.
>> The error in the attached file is generated only by that code.
>>
>>
>> On Mon, Nov 30, 2009 at 11:30 AM, Roman Perepelitsa <
>> roman.perepelitsa_at_[hidden]> wrote:
>>
>>> 2009/11/30 Conoscenza Silente <abruzzoforteegentile_at_[hidden]>
>>>
>>> Hi All
>>>> I tried to use pow function from <cmath> in a lamda function using
>>>> boost::lamdba.
>>>> Below the piece of code I used.
>>>> Do you know what is wrong with it?
>>>> Thank you very much.
>>>> CS
>>>>
>>>> double l_tmp;
>>>> double p_tmp;
>>>>
>>>> constant_type<double>::type h( constant(2.3) );
>>>> constant_type<double>::type g( constant(1.2) );
>>>>
>>>> var_type<double>::type tmp( var(l_tmp) );
>>>> var_type<double>::type pow_tmp( var(p_tmp) );
>>>>
>>>> std::for_each( x.begin(), x.end(),(
>>>> tmp = 10,
>>>>  pow_tmp = boost::lambda::bind( pow, tmp - h - g , 3.15 )
>>>> ));
>>>>
>>>
>>> Does it compile? If not, can you post an error message? If it compiles,
>>> do you encounter any problems in run time?
>>>
>>> Roman Perepelitsa.
>>>
>>> _______________________________________________
>>> Boost-users mailing list
>>> Boost-users_at_[hidden]
>>> http://lists.boost.org/mailman/listinfo.cgi/boost-users
>>>
>>
>>
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>
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