unordered_set::count

아티클
06/09/2015

Finds the number of elements matching a specified key.

size_type count(const Key& keyval) const;

매개 변수

keyval
Key value to search for.

설명

The member function returns the number of elements in the range delimited by unordered_set::equal_range(keyval).

예제

// std_tr1__unordered_set__unordered_set_count.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; 
 
    std::cout << "count('A') == " << c1.count('A') << std::endl; 
    std::cout << "count('b') == " << c1.count('b') << std::endl; 
    std::cout << "count('C') == " << c1.count('C') << std::endl; 
 
    return (0); 
    }