unordered_set::key_type

The type of an ordering key.

typedef Key key_type;

Remarks

The type is a synonym for the template parameter Key.

Example

 

// std_tr1__unordered_set__unordered_set_key_type.cpp 
// compile with: /EHsc 
#include <unordered_set> 
#include <iostream> 
 
typedef std::unordered_set<char> Myset; 
int main() 
    { 
    Myset c1; 
 
    c1.insert('a'); 
    c1.insert('b'); 
    c1.insert('c'); 
 
// display contents " [c] [b] [a]" 
    for (Myset::const_iterator it = c1.begin(); 
        it != c1.end(); ++it) 
        std::cout << " [" << *it << "]"; 
    std::cout << std::endl; 
 
// add a value and reinspect 
    Myset::key_type key = 'd'; 
    Myset::value_type val = key; 
    c1.insert(val); 
 
    for (Myset::const_iterator it = c1.begin(); 
        it != c1.end(); ++it) 
        std::cout << " [" << *it << "]"; 
    std::cout << std::endl; 
 
    return (0); 
    } 
 

 [c] [b] [a]
 [d] [c] [b] [a]

Requirements

Header: <unordered_set>

Namespace: std

See Also

Reference

<unordered_set>

unordered_set Class

unordered_set::value_type