Re: [Boost-users] Boost TraitsType Question

Subject: Re: [Boost-users] Boost TraitsType Question
From: Marshall Clow (mclow.lists_at_[hidden])
Date: 2012-10-04 14:15:16

On Oct 4, 2012, at 10:58 AM, "Rawate, Vishal CIV NAVAIR-WD-5-2-7-1-1-0-E., 527110E" <vishal.rawate_at_[hidden]> wrote:

> Hello,
> 
> I am writing a function using templates in C++.I want to find the type of variable that is being to the function.
> I was wondering if I could use the Boost TypeTraits library or is there another library that I can use.
> I would highly appreciate any help.
> 
> Thanking in advance.
> 
> Vishal
> 
> CodeSnipet:
> 
> Template<typename T>
> 
> Void setTag(T myVariable)
> {
>      If(T == short)
>     {
> 		Do something;
>     }
> 
> 	If(T == long)
> 	{
> 		Do something;
> 	}
> }

The way I usually do this is via template specialization:

#include <iostream>

template <typename T>
void foo ( T val ) {
        std::cout << "other\n";
        }

template <>
void foo (int val) {
        std::cout << "int\n";
        }

template <>
void foo (long val) {
        std::cout << "long\n";
        }

int main ( int argc, char *argv [] ) {
        
        foo ( 1 );
        foo ( 1L );
        foo ( "abc" );
        }
        
but if you really want to use type traits, I think that boost::is_same is what you want.
        http://www.boost.org/doc/libs/1_51_0/libs/type_traits/doc/html/boost_typetraits/reference/is_same.html

-- Marshall

Marshall Clow     Idio Software   <mailto:mclow.lists_at_[hidden]>

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