needed_cast.hxx

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#ifndef INCLUDED_SW_SOURCE_FILTER_WW8_NEEDED_CAST_HXX
#define INCLUDED_SW_SOURCE_FILTER_WW8_NEEDED_CAST_HXX
 
#include <osl/diagnose.h>
 
namespace ww
{
    template<typename Ret, typename Param> Ret checking_cast(Param in, Ret)
    {
        return static_cast<Ret>(in);
    }
 
    template<typename Ret> Ret checking_cast(Ret in, Ret)
    {
        OSL_ENSURE( false, "UnnecessaryCast" );
        return in;
    }
 
    /*
     needed_cast is the same as static_cast except that there will be a compile
     time assert when NDEBUG is not defined and the in and out types are the
     same.  i.e. needed_cast catches unnecessary casts
    */
    template<typename Ret, typename Param> Ret needed_cast(Param in)
    {
        /*
         Massage a single argument and a ret value into two arguments to allow
         a determination if the dest type is the same as the source type
        */
        return checking_cast(in, Ret());
    }
}
#endif
 
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