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std::isfinite(3) C++ Standard Libary std::isfinite(3) NAME std::isfinite - std::isfinite Synopsis Defined in header <cmath> bool isfinite( float num ); (since C++11) bool isfinite( double num ); (until C++23) bool isfinite( long double num ); constexpr bool isfinite( /* floating-point-type */ (1) (since C++23) num ); Additional overloads Defined in header <cmath> template< class Integer > (A) (since C++11) bool isfinite( Integer num ); (const- expr since C++23) 1) Determines if the given floating point number num has finite value i.e. it is normal, subnormal or zero, but not infinite or NaN. The library provides overloads for all cv-unqualified floating-point types as the type of the parameter num. (since C++23) A) Additional overloads are provided for all integer types, which are treated as double. Parameters num - floating-point or integer value Return value true if num has finite value, false otherwise. Notes The additional overloads are not required to be provided exactly as (A). They only need to be sufficient to ensure that for their argument num of inte- ger type, std::isfinite(num) has the same effect as std::isfinite(sta- tic_cast<double>(num)). Examples // Run this code #include <cfloat> #include <cmath> #include <iostream> int main() { std::cout << std::boolalpha << "isfinite(NaN) = " << std::isfinite(NAN) << '\n' << "isfinite(Inf) = " << std::isfinite(INFINITY) << '\n' << "isfinite(-Inf) = " << std::isfinite(-INFINITY) << '\n' << "isfinite(HUGE_VAL) = " << std::isfinite(HUGE_VAL) << '\n' << "isfinite(0.0) = " << std::isfinite(0.0) << '\n' << "isfinite(exp(800)) = " << std::isfi- nite(std::exp(800)) << '\n' << "isfinite(DBL_MIN/2.0) = " << std::isfinite(DBL_MIN / 2.0) << '\n'; } Output: isfinite(NaN) = false isfinite(Inf) = false isfinite(-Inf) = false isfinite(HUGE_VAL) = false isfinite(0.0) = true isfinite(exp(800)) = false isfinite(DBL_MIN/2.0) = true See also fpclassify categorizes the given floating-point value (C++11) (function) isinf checks if the given number is infinite (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) C documentation for isfinite http://cppreference.com 2024.06.10 std::isfinite(3)
NAME | Synopsis | Parameters | Return value | Notes | Examples | Output: | See also
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