basic_string::size
Retourne le nombre actuel d'éléments dans une chaîne.
size_type size( ) const;
Valeur de retour
La longueur de la chaîne.
Exemple
// basic_string_size.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;
// The size and length member functions differ in name only
basic_string <char>::size_type sizeStr1, lenStr1;
sizeStr1 = str1.size ( );
lenStr1 = str1.length ( );
basic_string <char>::size_type capStr1, max_sizeStr1;
capStr1 = str1.capacity ( );
max_sizeStr1 = str1.max_size ( );
// Compare size, length, capacity & max_size of a string
cout << "The current size of original string str1 is: "
<< sizeStr1 << "." << endl;
cout << "The current length of original string str1 is: "
<< lenStr1 << "." << endl;
cout << "The capacity of original string str1 is: "
<< capStr1 << "." << endl;
cout << "The max_size of original string str1 is: "
<< max_sizeStr1 << "." << endl << endl;
str1.erase ( 6, 5 );
cout << "The modified string str1 is: " << str1 << endl;
sizeStr1 = str1.size ( );
lenStr1 = str1.length ( );
capStr1 = str1.capacity ( );
max_sizeStr1 = str1.max_size ( );
// Compare size, length, capacity & max_size of a string
// after erasing part of the original string
cout << "The current size of modified string str1 is: "
<< sizeStr1 << "." << endl;
cout << "The current length of modified string str1 is: "
<< lenStr1 << "." << endl;
cout << "The capacity of modified string str1 is: "
<< capStr1 << "." << endl;
cout << "The max_size of modified string str1 is: "
<< max_sizeStr1 << "." << endl;
}
Résultat de l'exemple
La sortie suivante est pour x86.
The original string str1 is: Hello world
The current size of original string str1 is: 11.
The current length of original string str1 is: 11.
The capacity of original string str1 is: 15.
The max_size of original string str1 is: 4294967294.
The modified string str1 is: Hello
The current size of modified string str1 is: 6.
The current length of modified string str1 is: 6.
The capacity of modified string str1 is: 15.
The max_size of modified string str1 is: 4294967294.
Configuration requise
En-tête : <chaîne>
Espace de noms : std