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std::wcstoimax, std::wcstoumax

De cppreference.com
< cpp‎ | string‎ | wide

 
 
Bibliothèque de chaînes de caractères
Chaînes à zéro terminal
Original:
Null-terminated strings
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Les chaînes d'octets
Chaines multi-octets
Les chaînes étendues
Classes
Original:
Classes
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basic_string
char_traits
 
Chaînes à zéro terminal de large
Fonctions
Original:
Functions
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Manipulation caractère
Original:
Character manipulation
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Conversion aux formats numériques
Original:
Conversions to numeric formats
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La manipulation de chaînes
Original:
String manipulation
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La manipulation des tableaux
Original:
Array manipulation
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wmemcpy
wmemmove
wmemcmp
wmemchr
wmemset
 
Defined in header <cwchar>
std::intmax_t wcstoimax( const wchar_t* nptr, wchar_t** endptr, int base);
(depuis C++11)
std::uintmax_t wcstoumax( const wchar_t* nptr, wchar_t** endptr, int base);
(depuis C++11)
Interpréter une valeur d'entier non signé dans une chaîne large pointé par nptr .
Original:
Interprets an unsigned integer value in a wide string pointed to by nptr.
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Function discards any whitespace characters until first non-whitespace character is found. Then it takes as many characters as possible to form a valid base-n (where n=base) unsigned integer number representation and converts them to an integer value. The valid unsigned integer value consists of the following parts: None

  • (en option) prefix (0) indicating octal base (applies only when the base is 8)
  • (en option) prefix (0x or 0X) indicating hexadecimal base (applies only when the base is 16)
  • a sequence of digits

The set of valid digits for base-2 integer is 01, for base-3 integer is 012, and so on. For bases larger than 10, valid digits include alphabetic characters, starting from Aa for base-11 integer, to Zz for base-36 integer. The case of the characters is ignored.

Les fonctions définit le pointeur pointé par endptr pour pointer vers le caractère large passé le dernier caractère interprété. Si endptr est NULL, il est ignoré .
Original:
The functions sets the pointer pointed to by endptr to point to the wide character past the last character interpreted. If endptr is NULL, it is ignored.
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Sommaire

[modifier] Paramètres

nptr -
pointeur vers la chaîne se terminant par null large pour être interprété
Original:
pointer to the null-terminated wide string to be interpreted
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endptr -
pointeur vers un pointeur vers un caractère large .
Original:
pointer to a pointer to a wide character.
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base -
Base de la valeur entière interprété
Original:
base of the interpreted integer value
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[modifier] Retourne la valeur

Valeur entière correspondant au contenu de str en cas de succès. Si la valeur convertie tombe hors de portée du type de retour correspondante, une erreur d'intervalle se produit et INTMAX_MAX, INTMAX_MIN, UINTMAX_MAX ou 0 est retourné, le cas échéant. Si aucune conversion peut être effectuée, 0 est retourné .
Original:
Integer value corresponding to the contents of str on success. If the converted value falls out of range of corresponding return type, range error occurs and INTMAX_MAX, INTMAX_MIN, UINTMAX_MAX, or 0 is returned, as appropriate. If no conversion can be performed, 0 is returned.
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[modifier] Exemple

#include <iostream>
#include <string>
#include <cinttypes>
 
int main()
{
    std::wstring str = L"helloworld";
    std::intmax_t val = std::wcstoimax(str.c_str(), nullptr, 36);
    std::wcout << str << " in base 36 is " << val << " in base 10\n";
 
    wchar_t* nptr;
    val = std::wcstoimax(str.c_str(), &nptr, 30);
    if(nptr != &str[0] + str.size())
        std::wcout << str << " in base 30 is invalid."
                  << " The first invalid digit is " << *nptr << '\n';
}

Résultat :

helloworld in base 36 is 1767707668033969 in base 10
helloworld in base 30 is invalid. The first invalid digit is w

[modifier] Voir aussi

(C++11)
(C++11)
convertit une chaîne d'octets à std::intmax_t ou std::uintmax_t
Original:
converts a byte string to std::intmax_t or std::uintmax_t
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(fonction) [edit]
convertit une chaîne de largeur à une valeur entière
Original:
converts a wide string to an integer value
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(fonction) [edit]
convertit une chaîne de large pour une valeur d'entier non signé
Original:
converts a wide string to an unsigned integer value
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(fonction) [edit]
C documentation for wcstoimax, wcstoumax