CGAL 6.1.1 - Number Types

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CGAL::Is_valid< T > Class Template Reference
Reference Manual » Utilities

`#include <CGAL/utils_classes.h>`

## Definition

template<typename T>
class CGAL::Is_valid< T >

Not all values of a type need to be valid.

The function object class `Is_valid` checks this.

For example, an expression like `NT(0)/NT(0)` can result in an invalid number. Routines may have as a precondition that all values are valid.

Is model of
  `AdaptableFunctor`

## Operations
bool | operator() (const T &x)
| returns if the argument is valid.