Arithmetic Template in C++

In this article we will be discussing the working, syntax and examples of std::is_arithmetic template in C++ STL.

is_arithmetic template helps to check whether the given class T is of arithmetic type or not.

What is an Arithmetic Type?

Arithmetic type consists of two types, that are

• integral types − In this we define the whole numbers. The following are the type of integral types −

  • char
  • bool
  • int
  • long
  • short
  • long long
  • wchar_t
  • char16_t
  • char32_t

• floating point types − These can hold fractional parts. The following are the type of floating point.

  • Float
  • Double
  • Long double

So, template is_arithmatic checks the defined type T is an arithmetic type or not and returns true or false accordingly.

Syntax

template <class T> is_arithmetic;

Parameters

A template can have only one parameter that is of type T, and checks the parameter is of arithmetic type or not.

Return value

This function returns a bool type value, that can be either true or false. It returns true if the given type is arithmetic and false if the type is not arithmetic.

Example

Input: is_arithmetic<bool>::value;
Output: True

Input: is_arithmetic<class_a>::value;
Output: false

Example

 Live Demo

#include <iostream>
#include <type_traits>
using namespace std;
class TP {
};
int main() {
   cout << boolalpha;
   cout << "checking for is_arithmetic template:";
   cout << "\nTP class : "<< is_arithmetic<TP>::value;
   cout << "\n For Bool value: "<< is_arithmetic<bool>::value;
   cout << "\n For long value : "<< is_arithmetic<long>::value;
   cout << "\n For Short value : "<< is_arithmetic<short>::value;
   return 0;
}

Output

If we run the above code it will generate the following output −

checking for is_arithmetic template:
TP class : false
For Bool value: true
For long value : true
For Short value : true

Example

 Live Demo

#include <iostream>
#include <type_traits>
using namespace std;
int main() {
   cout << boolalpha;
   cout << "checking for is_arithmetic template:";
   cout << "\nInt : "<< is_arithmetic<int>::value;
   cout << "\nchar : "<< is_arithmetic<char>::value;
   cout << "\nFloat : "<< is_arithmetic<float>::value;
   cout << "\nDouble : "<< is_arithmetic<double>::value;
   cout << "\nInt *: "<< is_arithmetic<int*>::value;
   cout << "\nchar *: "<< is_arithmetic<char*>::value;
   cout << "\nFloat *: "<< is_arithmetic<float*>::value;
   cout << "\nDouble *: "<< is_arithmetic<double*>::value;
   return 0;
}

Output

If we run the above code it will generate the following output −

checking for is_arithmetic template:
Int : true
Char : true
Float : true
Double : true
Int * : float
Char *: float
Float *: float
Double *: float