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std::basic_string::shrink_to_fit

From cppreference.com
< cpp‎ | string‎ | basic string
 
 
 
std::basic_string
 
void shrink_to_fit();
(since C++11)

Requests the removal of unused capacity.

It is a non-binding request to reduce capacity() to size(). It depends on the implementation if the request is fulfilled.

If reallocation takes place, all pointers, references, and iterators are invalidated.

Contents

[edit] Parameters

(none)

[edit] Return value

(none)

[edit] Complexity

Constant

[edit] Example

#include <iostream>
#include <string>
 
int main()
{
    std::string s;
    std::cout << "Default-constructed capacity is " << s.capacity() << '\n';
    s.resize(100);
    std::cout << "Capacity of a 100-element string is " << s.capacity() << '\n';
    s.clear();
    std::cout << "Capacity after clear() is " << s.capacity() << '\n';
    s.shrink_to_fit();
    std::cout << "Capacity after shrink_to_fit() is " << s.capacity() << '\n';
}

Output:

Default-constructed capacity is 0
Capacity of a 100-element string is 100
Capacity after clear() is 100
Capacity after shrink_to_fit() is 0

[edit] See also

returns the number of characters
(public member function) [edit]
returns the number of characters that can be held in currently allocated storage
(public member function) [edit]