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map max_size() in C++ STL
In this article we will be discussing the working, syntax and examples of map::max_size() function in C++ STL.
What is a Map in C++ STL?
Maps are the associative container, which facilitates to store the elements formed by a combination of key value and mapped value in a specific order. In a map container the data is internally always sorted with the help of its associated keys. The values in the map container are accessed by its unique keys.
What is a map::max_size()?
map::max_size() function is an inbuilt function in C++ STL, which is defined in <map> header file. max_size() is used to return the maximum size of the map container.
This function is used to check the maximum number of values that a map container can hold. The size is like the potential of the container, hence there is no guarantee that it can reach that value or not.
Syntax
Map_name.max_size();
Parameter
This function accepts no parameter.
Return value
This function returns the number of elements a container can hold.
Input
map<char, int> newmap; newmap.max_size();
Output
Max size of map is: 461168601842738790
Example
#include <bits/stdc++.h>
using namespace std;
int main(){
map<int, int> TP_1, TP_2;
TP_1.insert({ 0, 10 });
cout<<"Max size of map with elements is: " << TP_1.max_size();
cout<<"\Max size of map without elements is: " << TP_2.max_size();
return 0;
}Output
If we run the above code it will generate the following output −
Max size of map with elements is: 461168601842738790 Max size of map without elements is: 461168601842738790
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