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std::basic_string::resize

From cppreference.com
< cpp‎ | string‎ | basic string
 
 
 
std::basic_string
 
void resize( size_type count );
(1)
void resize( size_type count, CharT ch );
(2)

Resizes the string to contain count characters.

If the current size is less than count, additional characters are appended.

If the current size is greater than count, the string is reduced to its first count elements.

The first version initializes new characters to CharT(), the second version initializes new characters to ch.

Contents

[edit] Parameters

count - new size of the string
ch - character to initialize the new characters with

[edit] Return value

(none)

[edit] Exceptions

std::length_error if count > max_size(). Any exceptions thrown by corresponding Allocator.

If an exception is thrown for any reason, this function has no effect (strong exception guarantee).(since C++11)

[edit] Example

#include <iostream>
#include <stdexcept>
 
int main()
{
    std::string s;
 
    try {
        // size is OK, no length_error
        // (may throw bad_alloc)
        s.resize(s.max_size() - 1, 'x');
    } catch (std::bad_alloc&) {
        std::cout << "1. bad alloc\n";
    }
 
    try {
        // size is OK, no length_error
        // (may throw bad_alloc)
        s.resize(s.max_size(), 'x');
    } catch (std::bad_alloc& exc) {
        std::cout << "2. bad alloc\n";
    }
 
    try {
        // size is BAD, throw length_error
        s.resize(s.max_size() + 1, 'x');
    } catch (std::length_error&) {
        std::cout << "3. length error\n";
    }
}

Possible output:

1. bad alloc
2. bad alloc
3. length error

[edit] Complexity

Linear in the size of the string.

[edit] See also

returns the number of characters
(public member function) [edit]