[boost] Re: lexical_cast to self

From: David Abrahams (dave_at_[hidden])
Date: 2004-09-27 19:02:09

"Arkadiy Vertleyb" <vertleyb_at_[hidden]> writes:

> "Maxim Yegorushkin" <e-maxim_at_[hidden]> wrote
>
>> In generic code lexical_cast<> is sometimes used as a cast to the same
>> type. I would like to shortcut this rather then going all the way by
>> writing it to a stream and reading back. In my code I use the following
>> workaround:
>>
>> template<class U, class T>
>> inline typename boost::disable_if<boost::is_same<T, U>, U>::type
>> lexical_cast(T const& t)
>> {
>>      return boost::lexical_cast<U>(t);
>> }
>>
>> template<class T>
>> inline T const& lexical_cast(T const& t)
>> {
>>      return t;
>> }
>>
>> Does it make any sense to put it in lexical_cast.hpp?
>
> Unless somebody already started using it to get the first token from a
> string, like:
>
> boost::lexical_cast<string>(string("I am a string with spaces")); // now
> returns just "I"

I can think of other uses.  You might lexical_cast T->T in order to
normalize the value somehow.

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com