unordered_map::count
Finds the number of elements matching a specified key.
size_type count(const Key& keyval) const;
Parameters
- keyval
Key value to search for.
Remarks
The member function returns the number of elements in the range delimited by unordered_map::equal_range(keyval).
Example
// std_tr1__unordered_map__unordered_map_count.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::const_iterator it = c1.begin();
it != c1.end(); ++it)
std::cout << " [" << it->first << ", " << it->second << "]";
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);
}
[c, 3] [b, 2] [a, 1]
count('A') == 0
count('b') == 1
count('C') == 0
Requirements
Header: <unordered_map>
Namespace: std