reference_wrapper in C++
Last Updated :
03 Dec, 2019
std::reference_wrapper is a class template that wraps a reference in a copy constructible and copy assignable object or reference to function of type T.
Instances of std::reference_wrapper are objects (they can be copied or stored in containers) but they are implicitly convertible to ‘T&’ so that they can be used as arguments with the functions that take the underlying type by reference.
Syntax:
template <class T> class reference_wrapper;
template parameter(T): type of the referred element and
this can be either function or object.
Example:
#include <iostream>
#include <functional>
using namespace std;
int main ()
{
char a = 'g' , b = 'e' , c = 'e' , d = 'k' , e = 's' ;
reference_wrapper< char > ref[] = {a, b, c, d, e};
for ( char & s : ref)
cout << s;
return 0;
}
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Output:
geeks
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