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std::isinf(3) C++ Standard Libary std::isinf(3) NAME std::isinf - std::isinf Synopsis Defined in header <cmath> bool isinf( float arg ); (1) (since C++11) (constexpr since C++23) bool isinf( double arg ); (2) (since C++11) (constexpr since C++23) bool isinf( long double arg ); (3) (since C++11) (constexpr since C++23) bool isinf( IntegralType arg ); (4) (since C++11) (constexpr since C++23) 1-3) Determines if the given floating-point number arg is a positive or negative infinity. 4) A set of overloads or a function template accepting the arg argu- ment of any integral type. Equivalent to (2) (the argument is cast to double). Parameters arg - floating point value Return value true if arg is infinite, false otherwise Example // Run this code #include <iostream> #include <cmath> #include <cfloat> int main() { std::cout << std::boolalpha << "isinf(NaN) = " << std::isinf(NAN) << '\n' << "isinf(Inf) = " << std::isinf(INFINITY) << '\n' << "isinf(0.0) = " << std::isinf(0.0) << '\n' << "isinf(exp(800)) = " << std::isinf(std::exp(800)) << '\n' << "isinf(DBL_MIN/2.0) = " << std::isinf(DBL_MIN/2.0) << '\n'; } Output: isinf(NaN) = false isinf(Inf) = true isinf(0.0) = false isinf(exp(800)) = true isinf(DBL_MIN/2.0) = false See also fpclassify categorizes the given floating-point value (C++11) (function) isfinite checks if the given number has finite value (C++11) (function) isnan checks if the given number is NaN (C++11) (function) isnormal checks if the given number is normal (C++11) (function) http://cppreference.com 2022.07.31 std::isinf(3)
NAME | Synopsis | Parameters | Return value | Example | Output: | See also
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