unordered_map bucket() in C++ STL
Last Updated :
11 Jun, 2021
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The unordered_map::bucket() is a built-in STL function in C++ which returns the bucket number where the element with the key k is located in the map.
Syntax:
size_type bucket(key)
Parameter: The function accepts one mandatory parameter key which specifies the key whose bucket number is to be returned.
Return Value: This method returns an unsigned integral type which represents the bucket number of the key k which is passed in the parameter.
Below program illustrate the unordered_map::bucket() function:
// CPP program to demonstrate the
// unordered_map::bucket() function
#include <bits/stdc++.h>
using namespace std;
int main()
{
// Declaration
unordered_map<string, string> mymap;
// Initialisation
mymap = { { "Australia", "Canberra" },
{ "U.S.", "Washington" },
{ "France", "Paris" } };
// prints the bucket number of the beginning element
auto it = mymap.begin();
// stores the bucket number of the key k
int number = mymap.bucket(it->first);
cout << "The bucket number of key " << it->first
<< " is " << number;
return 0;
}
// CPP program to demonstrate the// unordered_map::bucket() functionusing namespace std;int main(){ // Declaration unordered_map<string, string> mymap; // Initialisation mymap = { { "Australia", "Canberra" }, { "U.S.", "Washington" }, { "France", "Paris" } }; // prints the bucket number of the beginning element auto it = mymap.begin(); // stores the bucket number of the key k int number = mymap.bucket(it->first); cout << "The bucket number of key " << it->first << " is " << number; return 0;}Output:
The bucket number of key France is 3
