type_traits::alignment_of template in C++

It is used to find the member constant value equal to the alignment requirement of the type T. If T is a reference type than it returns the alignment requirements of the type referred to. If T is an array type than it returns the alignment requirements of the element type.

Header File:

#include<type_traits>

Syntax:

template
  <class T>
  struct alignment_of;

Parameter: The template std::alignment_of accepts a single parameter T (Trait class).

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

Program 1:

// C++ program to illustrate 
// assignment_of template 
  
#include <bits/stdc++.h> 
#include <type_traits> 
using namespace std; 
  
class GFG { 
}; 
  
// main mehod 
int main() 
{ 
    cout << alignment_of<GFG>::value << endl; 
    cout << alignment_of<int>() << endl; 
    cout << alignment_of<double>() << endl; 
  
    return 0; 
} 

Output:

1
4
8

Program 2:

// C++ program to illustrate 
// assignment_of template 
  
#include <bits/stdc++.h> 
#include <type_traits> 
using namespace std; 
  
class GFG { 
}; 
  
// main method 
int main() 
{ 
    cout << alignment_of<GFG>::value << endl; 
    cout << alignment_of<float>() << endl; 
    cout << alignment_of<char>() << endl; 
  
    return 0; 
} 

Output:

1
4
1

Reference: http://www.cplusplus.com/reference/type_traits/alignment_of/

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