basic_string::resize
Especifica un nuevo tamaño para una cadena, anexando o borrando elementos como sea necesario.
void resize(
size_type _Count,
);
void resize(
size_type _Count,
_Elem _Ch
);
Parámetros
_Count
El nuevo tamaño de la cadena._Ch
El valor que los caracteres anexados se inicializan con si se requieren los elementos adicionales.
Comentarios
Si el tamaño resultante supera el número máximo de caracteres, el formulario produce length_error.
Ejemplo
// basic_string_resize.cpp
// compile with: /EHsc
#include <string>
#include <iostream>
int main( )
{
using namespace std;
string str1 ( "Hello world" );
cout << "The original string str1 is: " << str1 << endl;
basic_string <char>::size_type sizeStr1;
sizeStr1 = str1.size ( );
basic_string <char>::size_type capStr1;
capStr1 = str1.capacity ( );
// Compare size & capacity of the original string
cout << "The current size of original string str1 is: "
<< sizeStr1 << "." << endl;
cout << "The capacity of original string str1 is: "
<< capStr1 << "." << endl << endl;
// Use resize to increase size by 2 elements: exclamations
str1.resize ( str1.size ( ) + 2 , '!' );
cout << "The resized string str1 is: " << str1 << endl;
sizeStr1 = str1.size ( );
capStr1 = str1.capacity ( );
// Compare size & capacity of a string after resizing
cout << "The current size of resized string str1 is: "
<< sizeStr1 << "." << endl;
cout << "The capacity of resized string str1 is: "
<< capStr1 << "." << endl << endl;
// Use resize to increase size by 20 elements:
str1.resize ( str1.size ( ) + 20 );
cout << "The resized string str1 is: " << str1 << endl;
sizeStr1 = str1.size ( );
capStr1 = str1.capacity ( );
// Compare size & capacity of a string after resizing
// note capacity increases automatically as required
cout << "The current size of modified string str1 is: "
<< sizeStr1 << "." << endl;
cout << "The capacity of modified string str1 is: "
<< capStr1 << "." << endl << endl;
// Use resize to downsize by 28 elements:
str1.resize ( str1.size ( ) - 28 );
cout << "The downsized string str1 is: " << str1 << endl;
sizeStr1 = str1.size ( );
capStr1 = str1.capacity ( );
// Compare size & capacity of a string after downsizing
cout << "The current size of downsized string str1 is: "
<< sizeStr1 << "." << endl;
cout << "The capacity of downsized string str1 is: "
<< capStr1 << "." << endl;
}
Requisitos
encabezado: <cadena>
espacio de nombres: std