is_scalar Class
The latest version of this topic can be found at is_scalar Class.
Tests if type is scalar.
Syntax
template <class Ty>
struct is_scalar;
Parameters
Ty
The type to query.
Remarks
An instance of the type predicate holds true if the type Ty is an integral type, a floating point type, an enumeration type, a pointer type, or a pointer to member type, or a cv-qualified form of one of them, otherwise it holds false.
Example
// std_tr1__type_traits__is_scalar.cpp
// compile with: /EHsc
#include <type_traits>
#include <iostream>
struct trivial
{
int val;
};
int main()
{
std::cout << "is_scalar<trivial> == " << std::boolalpha
<< std::is_scalar<trivial>::value << std::endl;
std::cout << "is_scalar<trivial *> == " << std::boolalpha
<< std::is_scalar<trivial *>::value << std::endl;
std::cout << "is_scalar<int> == " << std::boolalpha
<< std::is_scalar<int>::value << std::endl;
std::cout << "is_scalar<float> == " << std::boolalpha
<< std::is_scalar<float>::value << std::endl;
return (0);
}
is_scalar<trivial> == false
is_scalar<trivial *> == true
is_scalar<int> == true
is_scalar<float> == true
Requirements
Header: <type_traits>
Namespace: std