CGAL 4.7 - IO Streams: CGAL::Output_rep< T, F > Class Template Reference

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CGAL 4.7 - IO Streams

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CGAL::Output_rep< T, F > Class Template Reference
IO Streams Reference

`#include <CGAL/IO/io.h>`

## Definition

The purpose of `Output_rep` is to provide a way to control output formatting that works independently of the object's stream output operator.

If you dont specialize `Output_rep` for `T`, `T`'s stream output operator is called from within `Output_rep`, by default. If you want another behaviour for your type `T`, you have to provide a specialization for that type. Furthermore, you can provide specializations with a second template parameter (a formatting tag). The second template parameter defaults to `Null_tag` and means default behaviour.

Specializations of `Output_rep` should provide the following features:

template< class F >
struct Output_rep< Some_type, F > {
Output_rep( const Some_type& t );
std::ostream& operator()( std::ostream& out ) const;
};

You can also specialize for a formatting tag `F`.