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      std::isfinite

      From cppreference.com
      <cpp‎ |numeric‎ |math
       
       
       
      Common mathematical functions
      Nearest integer floating point operations
      (C++11)(C++11)(C++11)
      (C++11)
      (C++11)
      (C++11)(C++11)(C++11)
      Floating point manipulation functions
      (C++11)(C++11)
      (C++11)
      (C++11)
      Classification and comparison
      (C++11)
      isfinite
      (C++11)
      (C++11)
      (C++11)
      (C++11)
      (C++11)
      Types
      (C++11)
      (C++11)
      (C++11)
      Macro constants
       
      Defined in header<cmath>
      (1)
      bool isfinite(float num);

      bool isfinite(double num);

      bool isfinite(longdouble num);
      		(since C++11)
      (until C++23)
      constexprbool isfinite(/*floating-point-type*/ num);
      		(since C++23)
      SIMD overload(since C++26)
      Defined in header<simd>
      template</*math-floating-point*/ V>

      constexprtypename/*deduced-simd-t*/<V>::mask_type

        isfinite(const V& v_num);
      		 (S)(since C++26)
      Defined in header<cmath>
      template<class Integer>
      bool isfinite( Integer num);
      		 (A)(since C++11)
      (constexpr since C++23)
      1) Determines if the given floating point numbernum 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 parameternum.(since C++23)
      S) The SIMD overload performs an element-wisestd::isfinite onv_num.
      (Seemath-floating-point anddeduced-simd-t for their definitions.)
      		(since C++26)
      A) Additional overloads are provided for all integer types, which are treated asdouble.

      Contents

      [edit]Parameters

      num - floating-point or integer value
      v_num - a data-parallel object ofstd::basic_simd specialization where its element type is a floating-point type

      [edit]Return value

      1)true ifnum has finite value,false otherwise.
      S) A data-parallel mask object where the ith element equalstrue ifv_num[i] has finite value orfalse otherwise for alli in the range[​0​, v_num.size()).

      [edit]Notes

      The additional overloads are not required to be provided exactly as(A). They only need to be sufficient to ensure that for their argumentnum of integer type,std::isfinite(num) has the same effect asstd::isfinite(static_cast<double>(num)).

      [edit]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::isfinite(std::exp(800))<<'\n'<<"isfinite(DBL_MIN/2.0) = "<< std::isfinite(DBL_MIN/2.0)<<'\n';}

      Output:

      isfinite(NaN) = falseisfinite(Inf) = falseisfinite(-Inf) = falseisfinite(HUGE_VAL) = falseisfinite(0.0) = trueisfinite(exp(800)) = falseisfinite(DBL_MIN/2.0) = true

      [edit]See also

      (C++11)
      		 categorizes the given floating-point value
      (function)[edit]
      (C++11)
      		 checks if the given number is infinite
      (function)[edit]
      (C++11)
      		 checks if the given number is NaN
      (function)[edit]
      (C++11)
      		 checks if the given number is normal
      (function)[edit]
      C documentation forisfinite
      Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/numeric/math/isfinite&oldid=149495"
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