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The class Verbose_ostream can be used as an output stream. The stream output operator << is defined for any type. The class Verbose_ostream stores in an internal state a stream and whether the output is active or not. If the state is active, the stream output operator << uses the internal stream to output its argument. If the state is inactive, nothing happens.
#include <CGAL/IO/Verbose_ostream.h>
| Verbose_ostream verr ( bool active = false, std::ostream& out = std::cerr); | |
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creates an output stream with state set to
active that writes to the stream out.
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| template < class T > | ||
| Verbose_ostream& | verr << T t | |
The class Verbose_ostream can be conveniently used to implement for example the is_valid() member function for triangulations or other complex data structures.
bool is_valid( bool verbose = false, int level = 0) {
Verbose_ostream verr( verbose);
verr << "Triangulation::is_valid( level = " << level << ')' << endl;
verr << " Number of vertices = " << size_of_vertices() << endl;
// ...
}