Re: [Boost-users] Boost has a function to const-qualify?

From: MB (mb2act_at_[hidden])
Date: 2006-01-14 17:45:33

Sebastian Redl wrote:
> MB wrote:
> 
> 
>>Hi,
>>
>>Does boost has anything like :
>>
>> template< class T > inline
>> const T& const_(const T& x)
>> {
>>   return x;
>> }
>>
>>
>>I guess that boost::cref is different...
>> 
>>
> 
> What exactly is the use of this? Did you perhaps mean to make the 
> parameter non-const? If so, why would you need a function for something 
> that's an implicit cast anyway?

Hi,

A short story is:

   struct X { };
   void f(X& x);
   void f(const X& x);

   void test()
   {
     X x; {
       // initialize x.
     }

     f(const_(x));
   }

Here is the long story:
   http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2004/n1674.pdf

Regards,
MB
p-stade.sourceforge.net