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# std::isinf

From cppreference.com
< cpp‎ | numeric‎ | math

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

fpclassify (C++11) | categorizes the given floating point value (function) [edit]
isfinite (C++11) | checks if the given number has finite value (function) [edit]
isnan (C++11) | checks if the given number is NaN (function) [edit]
isnormal (C++11) | checks if the given number is normal (function) [edit]

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