std::isinf
From cppreference.com
                    
                                        
                    
                    
                                                            
                    | Defined in header  <cmath> | ||
| bool isinf( float arg ); | (since C++11) | |
| bool isinf( double arg ); | (since C++11) | |
| bool isinf( long double arg ); | (since C++11) | |
Determines if the given floating point number arg is positive or negative infinity. 
[edit] Parameters
| arg | - | floating point value | 
[edit] Return value
true if arg is infinite, false otherwise
[edit] See also
| (C++11) | categorizes the given floating point value (function) | 
| (C++11) | checks if the given number has finite value (function) | 
| (C++11) | checks if the given number is NaN (function) | 
| (C++11) | checks if the given number is normal (function) | 
| C documentation for isinf | |


