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The std::is_pointer template is an inbuilt template in C++ STL which is used to check the type of pointer. It is defined in header file type_traits. It inherits from member constant value and provide either true or false.

Syntax:

template <class T > struct is_pointer;

Template Parameter: This template contains single parameter T (Trait class) that identifies whether T is a pointer.

Return Value: The std::is_pointer template returns two values as shown below:

  • True: It returns True if the type is a pointer.
  • False: It returns False if the type is a non-pointer.

Below programs illustrate the std::is_pointer template in C++ STL:

Program 1:

[sourcecode language=”CPP”]

// C++ program to illustrate
// is_pointer

#include <iostream>
#include <type_traits>
using namespace std;

// main program
class S {
};

int main()
{
cout << boolalpha;
cout << "is_pointer:"
<< endl;
cout << "S: "
<< is_pointer<S>::value << ‘\n’;
cout << "S *: "
<< is_pointer<S*>::value << ‘\n’;
cout << "S &: "
<< is_pointer<S&>::value << ‘\n’;
cout << "nullptr_t: "
<< is_pointer<nullptr_t>::value << ‘\n’;

return 0;
}
[/sourcecode]

Output:

is_pointer:
S: false
S *: true
S &: false
nullptr_t: false

Program 2:

[sourcecode language=”CPP”]

// C++ program to illustrate
// is_pointer

#include <iostream>
#include <type_traits>
using namespace std;

// main program
int main()
{
cout << boolalpha;
cout << "is_pointer:"
<< endl;
cout << "int: "
<< is_pointer<int>::value << ‘\n’;
cout << "int *: "
<< is_pointer<int*>::value << ‘\n’;
cout << "int **: "
<< is_pointer<int**>::value << ‘\n’;
cout << "int ***: "
<< is_pointer<int***>::value << ‘\n’;

return 0;
}
[/sourcecode]

Output:

is_pointer:
int: false
int *: true
int **: true
int ***: true

Program 3:

[sourcecode language=”CPP”]

// C++ program to illustrate
// is_pointer

#include <iostream>
#include <type_traits>
using namespace std;

// main program
int main()
{

cout << boolalpha;
cout << "is_pointer:" << endl;
cout << "int *&: "
<< is_pointer<int*&>::value << ‘\n’;
cout << "int *[10]: "
<< is_pointer<int * [10]>::value << ‘\n’;
cout << "float *: "
<< is_pointer<float*>::value << ‘\n’;
cout << "int[10]:"
<< is_pointer<int[10]>::value << ‘\n’;

return 0;
}
[/sourcecode]

Output:

is_pointer:
int *&: false
int *[10]: false
float *: true
int[10]:false


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