Re: pointer casts(newbie)
On Feb 9, 4:38 pm, Kai-Uwe Bux <jkherci...@gmx.net> wrote:
James Kanze wrote:
[...]
If you cast it to a character type, you can access the
individual bytes. Modifying them will result in undefined
behavior if you later try to use the object with its
original type, but something like:
template< typename T >
void
dump(
std::ostream& dest,
T const& obj )
{
IOSave saver( dest ) ;
dest.setf( std::ios::hex, std::ios::basefield ) ;
dest.fill( '0' ) ;
unsigned char const*current
= reinterpret_cast< unsigned char const* >( &obj ) ;
unsigned char const*end = current + sizeof( T ) ;
while ( current != end ) {
dest << std::setw( 2 ) << *current ;
++ current ;
if ( current != end ) {
dest << ' ' ;
}
}
}
is sometimes useful (and has fully defined behavior).
Nice. I agree that it is sometimes useful to read the
underlying bytes of an object.
Just one additional note: in my toolkit, this is present as a
class, with an overloaded <<, and a simple function which
returns an instance of the class (for type deduction), so you
can write things like:
std::cerr << "x = " << dump( x ) << std::endl ;
Useful for debugging very low-level objects.
--
James Kanze (GABI Software) email:james.kanze@gmail.com
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