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      std::is_arithmetic

      From cppreference.com
      <cpp‎ |types
       
       
      Metaprogramming library
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      is_arithmetic
      (C++11)
      Type properties
      (C++11)
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      Compile-time rational arithmetic
      Compile-time integer sequences
       
      Defined in header<type_traits>
      template<class T>
      struct is_arithmetic;
      (since C++11)

      std::is_arithmetic is aUnaryTypeTrait.

      IfT is an arithmetic type (that is, an integral type or a floating-point type) or acv-qualified version thereof, provides the member constantvalue equal totrue. For any other type,value isfalse.

      If the program adds specializations forstd::is_arithmetic orstd::is_arithmetic_v(since C++17), the behavior is undefined.

      Contents

      [edit]Template parameters

      T - a type to check

      [edit]Helper variable template

      template<class T>
      constexprbool is_arithmetic_v= is_arithmetic<T>::value;
      (since C++17)
      [edit]

      Inherited fromstd::integral_constant

      Member constants

      value
      [static]
      true ifT is an arithmetic type,false otherwise
      (public static member constant)

      Member functions

      operator bool
      converts the object tobool, returnsvalue
      (public member function)
      operator()
      (C++14)
      returnsvalue
      (public member function)

      Member types

      Type Definition
      value_typebool
      typestd::integral_constant<bool, value>

      [edit]Notes

      Arithmetic types are the built-in types for which thearithmetic operators (+,-,*,/) are defined (possibly in combination with the usual arithmetic conversions).

      Specializations ofstd::numeric_limits are provided for all arithmetic types.

      [edit]Possible implementation

      template<class T>struct is_arithmetic:std::integral_constant<bool,std::is_integral<T>::value||std::is_floating_point<T>::value>{};

      [edit]Example

      Run this code
      #include <atomic>#include <cstddef>#include <type_traits> class A{}; enumclass B:int{ e}; static_assert(    std::is_arithmetic_v<bool>==true  and    std::is_arithmetic_v<char>==true  and    std::is_arithmetic_v<charconst>==true  and    std::is_arithmetic_v<int>==true  and    std::is_arithmetic_v<intconst>==true  and    std::is_arithmetic_v<float>==true  and    std::is_arithmetic_v<floatconst>==true  and    std::is_arithmetic_v<std::size_t>==true  and     std::is_arithmetic_v<char&>==false and    std::is_arithmetic_v<char*>==false and    std::is_arithmetic_v<int&>==false and    std::is_arithmetic_v<int*>==false and    std::is_arithmetic_v<float&>==false and    std::is_arithmetic_v<float*>==false and    std::is_arithmetic_v<A>==false and    std::is_arithmetic_v<B>==false and    std::is_arithmetic_v<decltype(B::e)>==false and    std::is_arithmetic_v<std::byte>==false and    std::is_arithmetic_v<std::atomic_int>==false); int main(){}

      [edit]See also

      checks if a type is an integral type
      (class template)[edit]
      checks if a type is a floating-point type
      (class template)[edit]
      Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/types/is_arithmetic&oldid=158175"

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