va_start
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<metanoindex/>
<tbody>| Déclaré dans l'en-tête <cstdarg>
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void va_start(va_list ap, parm_n); |
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</tbody>
La macro
va_start permet d'accéder aux arguments variables suivant l'argument nommé parm_n . Original:
The
va_start macro enables access to the variable arguments following the named argument parm_n. The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
va_start doit être appelée avec une instance à un objet valide va_list ap avant tout appel à va_arg .Original:
va_start should be invoked with an instance to a valid va_list object ap before any calls to va_arg.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Sommaire
Paramètres
| ap | - | une instance du type va_list
Original: an instance of the va_list type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| parm_n | - | le paramètre nommé précédant le premier paramètre variable
Original: the named parameter preceding the first variable parameter The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Élargi valeur
(Aucun)
Original:
(none)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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Exemple
#include <iostream>
#include <cstdarg>
int add_nums(int count, ...)
{
int result = 0;
va_list args;
va_start(args, count);
for (int i = 0; i < count; ++i) {
result += va_arg(args, int);
}
return result;
}
int main()
{
std::cout << add_nums(4, 25, 25, 50, 50) << '\n';
}
Résultat :
150
Voir aussi
accède à l'argument de la fonction suivante variadique Original: accesses the next variadic function argument The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction macro) | |
termine la traversée des arguments de la fonction variadique Original: ends traversal of the variadic function arguments The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction macro) |