Hi Boosters,
I was wondering if it would be possible to implement a wrapper around
built-in types to provide automatic detection of conversion
problems:
template< typename T >
class safe_numeric : boost::operators< safe_numeric<T> >
{
public:
typedef boost::detail::fixed_numeric_limits<T> result_traits;
safe_numeric() : t_( T() )
{
}
template< typename S >
safe_numeric( S s ) : t_( boost::numeric_cast<T>( s ) )
{
}
template< typename S >
safe_numeric& operator=( S s )
{
t_ = boost::numeric_cast<T>( s );
return *this;
}
operator T() const
{
return t_;
}
private:
T t_;
};
namespace boost
{
namespace detail
{
template <class T>
struct fixed_numeric_limits< safe_numeric<T> > :
public std::numeric_limits< T >
{
static const bool is_specialized = true;
};
}
}
typedef safe_numeric<char> Char;
typedef safe_numeric<short> Short;
typedef safe_numeric<int> Int;
typedef safe_numeric<long> Long;
typedef safe_numeric<float> Float;
typedef safe_numeric<double> Double;
Now, the most interesting question is if it's possible to get complete
transparency for the clients perspektive. I guess it's
a matter of overloading operators appropriately. Any comments on the
usefullness of such a template?
regards
Thorsten Ottosen
--
Thorsten Ottosen, Aalborg University
[EMAIL PROTECTED]
---------------------------------------------------
C++:
my_map[key]++;
Java:
if ( !my_map.containsKey( key ) )
my_map.put( key, new Integer( 1 ) );
else
{
Integer count = ( Integer )my_map.get( key ) );
int icount = count.IntValue();
my_map.put( key, new Integer( ++icount ) );
}
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