void shrink_to_fit();
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// string::shrink_to_fit
#include <iostream>
#include <string>
int main ()
{
std::string str (100,'x');
std::cout << "1. capacity of str: " << str.capacity() << '\n';
str.resize(10);
std::cout << "2. capacity of str: " << str.capacity() << '\n';
str.shrink_to_fit();
std::cout << "3. capacity of str: " << str.capacity() << '\n';
return 0;
}1. capacity of str: 100 2. capacity of str: 100 3. capacity of str: 10