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# std::is_arithmetic

From cppreference.com
< cpp‎ | types

Defined in header `<type_traits>` |  |
template< class T > struct is_arithmetic; |  | (since C++11)

If `T` is an arithmetic type (that is, an integral type or a floating-point type), provides the member constant `value` equal true. For any other type, `value` is false.

### [edit] Template parameters

T | - | a type to check

### [edit] Helper variable template

template< class T > inline constexpr bool is_arithmetic_v = is_arithmetic<T>::value; |  | (since C++17)

[edit]

## Inherited from std::integral_constant

### Member constants

value [static] | true if `T` is an arithmetic type , false otherwise (public static member constant)

### Member functions

operator bool | converts the object to bool, returns `value` (public member function)
operator() (C++14) | returns `value` (public member function)

### Member types

Type | Definition
`value_type` | `bool`
`type` | std::integral_constant<bool, value>

### [edit] Notes

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

Specializations of std::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 <iostream>
    #include <type_traits>

    class A {};

    int main()
    {
        std::cout << std::boolalpha;
        std::cout << "A:           " <<  std::is_arithmetic<A>::value << '\n';
        std::cout << "bool         " <<  std::is_arithmetic<bool>::value << '\n';
        std::cout << "int:         " <<  std::is_arithmetic<int>::value << '\n';
        std::cout << "int const:   " <<  std::is_arithmetic<int const>::value << '\n';
        std::cout << "int &:       " <<  std::is_arithmetic<int&>::value << '\n';
        std::cout << "int *:       " <<  std::is_arithmetic<int*>::value << '\n';
        std::cout << "float:       " <<  std::is_arithmetic<float>::value << '\n';
        std::cout << "float const: " <<  std::is_arithmetic<float const>::value << '\n';
        std::cout << "float &:     " <<  std::is_arithmetic<float&>::value << '\n';
        std::cout << "float *:     " <<  std::is_arithmetic<float*>::value << '\n';
    }

Output:

    A:           false
    bool:        true
    int:         true
    int const:   true
    int &:       false
    int *:       false
    float:       true
    float const: true
    float &:     false
    float *:     false

### [edit] See also

is_integral (C++11) | checks if a type is integral type (class template) [edit]
is_floating_point (C++11) | checks if a type is floating-point type (class template) [edit]

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