basic_string::resize
Spécifie une nouvelle taille pour une chaîne, en ajoutant ou effaçant des éléments au besoin.
void resize(
size_type _Count,
);
void resize(
size_type _Count,
_Elem _Ch
);
Paramètres
_Count
La nouvelle taille de la chaîne._Ch
La valeur que les caractères ajoutés sont initialisés à si les éléments supplémentaires sont requis.
Notes
Si la valeur obtenue excède le nombre maximal de caractères, le format génère length_error.
Exemple
// 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;
}
Configuration requise
En-tête : <chaîne>
Espace de noms : std