Re: [boost] No template cross-conversions?

From: Howard Hinnant (hinnant_at_[hidden])
Date: 2000-11-12 22:54:48

I don't have imaginary.hpp nor sgn_mag.hpp in front of me, but my best guess is that we're dealing with a member template conversion operator.  Unfortunately 5.3 will not call these methods implicitly.  They can however be called explicitly.  This problem has been fixed in Pro 6.

-Howard

On Sunday, November 12, 2000, at 10:23 PM, Daryle Walker wrote:
> For some reason, my cross-version constructors or conversion operators don't 
> work.  They gave errors when I tried to compile and use them in my test 
> code.  These examples are from my classes in "more_math.zip" in the Boost 
> vault. 
>  
> >From "sgn_mag.hpp" 
> // Why doesn't this work?! 
> //#ifndef BOOST_NO_MEMBER_TEMPLATES 
> //        template <typename U> 
> //        sgn_mag( const sgn_mag<U>& other ) 
> //            : mag_( other.magnitude() ), sgn_( other.negative() ) 
> //            {} 
> //#endif // BOOST_NO_MEMBER_TEMPLATES 
>  
> >From "imaginary.hpp" 
> //#ifdef BOOST_NO_MEMBER_TEMPLATES 
>     operator std::complex<T>() const 
>         { return std::complex<T>( j_ - j_, j_ ); } 
> //#else 
> // Why is this giving syntax errors 
> //    template <typename U = T> 
> //    operator std::complex<U>() const 
> //        { return std::complex<U>( j_ - j_, j_ ); } 
> //#endif // BOOST_NO_MEMBER_TEMPLATES 
>  
> I'm using Metrowerks CodeWarrior Pro 5 with the 5.3 update for the (regular) 
> Mac OS.  Is my code screwed-up or is the compiler missing something? 
>  
> --  
> Daryle Walker 
> Mac, Internet, and Video Game Junkie 
> darylew AT mac DOT com 
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