unordered_map::const_reference
The type of a constant reference to an element.
typedef Alloc::const_reference const_reference;
Remarks
The type describes an object that can serve as a constant reference to an element of the controlled sequence.
Example
// std_tr1__unordered_map__unordered_map_const_reference.cpp
// compile with: /EHsc
#include <unordered_map>
#include <iostream>
typedef std::unordered_map<char, int> Mymap;
int main()
{
Mymap c1;
c1.insert(Mymap::value_type('a', 1));
c1.insert(Mymap::value_type('b', 2));
c1.insert(Mymap::value_type('c', 3));
// display contents " [c 3] [b 2] [a 1]"
for (Mymap::iterator it = c1.begin();
it != c1.end(); ++it)
{
Mymap::const_reference ref = *it;
std::cout << " [" << ref.first << ", " << ref.second << "]";
}
std::cout << std::endl;
return (0);
}
[c, 3] [b, 2] [a, 1]
Requirements
Header: <unordered_map>
Namespace: std