unordered_set::find
Finds an element that matches a specified key.
const_iterator find(const Key& keyval) const;
Parameters
- keyval
Key value to search for.
Remarks
The member function returns unordered_set::equal_range(keyval).first.
Example
// std_tr1__unordered_set__unordered_set_find.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;
// try to find and fail
std::cout << "find('A') == "
<< std::boolalpha << (c1.find('A') != c1.end()) << std::endl;
// try to find and succeed
Myset::iterator it = c1.find('b');
std::cout << "find('b') == "
<< std::boolalpha << (it != c1.end())
<< ": [" << *it << "]" << std::endl;
return (0);
}
[c] [b] [a]
find('A') == false
find('b') == true: [b]
Requirements
Header: <unordered_set>
Namespace: std