unordered_map::Find
Localiza um elemento que coincida com uma chave especificada.
const_iterator find(const Key& keyval) const;
Parâmetros
- keyval
Valor de chave para pesquisar.
Comentários
A função de membro retorna unordered_map::equal_range(keyval).first.
Exemplo
// std_tr1__unordered_map__unordered_map_find.cpp
// compile with: /EHsc
#include <unordered_map>
#include <iostream>
typedef std::tr1::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;
// try to find and fail
std::cout << "find('A') == "
<< std::boolalpha << (c1.find('A') != c1.end()) << std::endl;
// try to find and succeed
Mymap::iterator it = c1.find('b');
std::cout << "find('b') == "
<< std::boolalpha << (it != c1.end())
<< ": [" << it->first << ", " << it->second << "]" << std::endl;
return (0);
}
[c, 3] [b, 2] [a, 1] find('A') == false find('b') == true: [b, 2]
Requisitos
Cabeçalho:<unordered_map>
Namespace: std::tr1