C++ String shrink_to_fit() function

C++ String shrink_to_fit() function tutorial for beginners and professionals with examples on constructor, if-else, switch, break, continue, comments, arrays, object and class, exception, static, structs, inheritance, aggregation etc.

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C++ String shrink_to_fit()

This function reduces the capacity of the string and makes it equal to its size.

Syntax

Consider a string str. Synatx would be:

str.shrink_to_fit();

Parameter

It does not contain any parameter.

Return value

It does not return any value.

Example 1

Let's see the simple example.

#include<iostream>
using namespace std;
int main()
{
	string str="C++ Programming";
	cout<<str.capacity()<<'\n';
	str.shrink_to_fit();
	cout<<str.capacity();
	return 0;
}

Output:

15
15

In this example, shrink_to_fit() function is applied to the string so that capacity of string becomes equal to the size of string.

Example 2

Let's see another simple example.

#include<iostream>
using namespace std;
int main()
{
	string str="Computer is my favorite subject";
	cout<<"Initial string value is :"<<str<<'\n';
	str.resize(24);
	cout<<"After resizing,string value is :"<<str<<'\n';
	str.shrink_to_fit();
	cout<<"capacity of the string is :"<<str.capacity()<<'\n';
	cout<<"size of the string is  :"<<str.size();
            return 0;
}

Output:

Initial string value is: Computer is my favorite subject
After resizing, string value is: Computer is my favorite 
capacity of the string is :24
size of the string is  :24

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