unordered_map bucket() in C++ STL
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
// 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; } |
Output:
The bucket number of key France is 3
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