unordered_multimap max_size() function in C++ STL (original) (raw)

Last Updated : 20 Aug, 2018

The unordered_multimap::max_size() is a built-in function in C++ STL which returns the maximum number of elements that the unordered_multimap container can hold. Syntax:

unorderedmultimapname.max_size()

Parameters: The function does not accepts any parameters. Return Value: It returns an integral values which denotes the maximum size of elements that the container can hold. Below programs illustrates the above function: Program 1:

CPP `

// C++ program to illustrate the // unordered_multimap::max_size() #include <bits/stdc++.h> using namespace std;

int main() {

// declaration
unordered_multimap<int, int> sample1;

// inserts key and element
// in sample1
sample1.insert({ 10, 100 });
sample1.insert({ 50, 500 });

cout << "The max number of elements that sample1 can hold: "
     << sample1.size();

cout << "\nKey and Elements of Sample1 are:";
for (auto it = sample1.begin(); it != sample1.end(); it++) {
    cout << "{" << it->first << ", " << it->second << "} ";
}

return 0;

}

`

Output:

The max number of elements that sample1 can hold: 2 Key and Elements of Sample1 are:{50, 500} {10, 100}

Program 2:

CPP `

// C++ program to illustrate the // unordered_multimap::max_size() #include <bits/stdc++.h> using namespace std;

int main() {

// declaration
unordered_multimap<char, char> sample1, sample2;

// inserts key and element
// in sample1
sample1.insert({ 'a', 'A' });
sample1.insert({ 'g', 'G' });

cout << "The max number of elements that sample1 can hold: "
     << sample1.size();

cout << "\nKey and Elements of Sample1 are:";
for (auto it = sample1.begin(); it != sample1.end(); it++) {
    cout << "{" << it->first << ", " << it->second << "} ";
}

return 0;

}

`

Output:

The max number of elements that sample1 can hold: 2 Key and Elements of Sample1 are:{g, G} {a, A}