Namespace
Varianti

std::wcstoimax, std::wcstoumax

Da cppreference.com.
< cpp‎ | string‎ | wide

 
 
Stringhe libreria
Null-stringhe terminate
Original:
Null-terminated strings
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Byte stringhe
Multibyte stringhe
Stringhe larghe
Classi
Original:
Classes
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basic_string
char_traits
 
Stringhe larghe null-terminated
Funzioni
Original:
Functions
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Carattere manipolazione
Original:
Character manipulation
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Le conversioni in formati numerici
Original:
Conversions to numeric formats
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Della gestione delle stringhe
Original:
String manipulation
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Matrice manipolazione
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);
(dal C++11)
std::uintmax_t wcstoumax( const wchar_t* nptr, wchar_t** endptr, int base);
(dal C++11)
Interpreta un valore intero in una stringa larga puntata da 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

  • (opzionale) prefix (0) indicating octal base (applies only when the base is 8)
  • (opzionale) 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.

Le funzioni imposta il puntatore puntato da endptr per puntare al carattere esteso oltre l'ultimo carattere interpretato. Se endptr è NULL, viene ignorato.
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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Indice

[modifica] Parametri

nptr -
puntatore alla stringa con terminazione null grande per essere interpretato
Original:
pointer to the null-terminated wide string to be interpreted
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endptr -
puntatore a un puntatore a un carattere ampio .
Original:
pointer to a pointer to a wide character.
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base -
Base del valore intero interpretato
Original:
base of the interpreted integer value
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[modifica] Valore di ritorno

Valore intero che corrisponde al contenuto di str in caso di successo. Se il valore convertito cade fuori dalla portata del corrispondente tipo di ritorno, errore di campo si verifica e INTMAX_MAX, INTMAX_MIN, UINTMAX_MAX o 0 viene restituito, a seconda dei casi. Se la conversione non può essere eseguita, viene restituito 0.
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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[modifica] Esempio

#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';
}

Output:

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

[modifica] Vedi anche

(C++11)
(C++11)
converte una stringa di byte di std::intmax_t o std::uintmax_t
Original:
converts a byte string to std::intmax_t or std::uintmax_t
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(funzione) [edit]
converte una stringa in largo per un valore intero
Original:
converts a wide string to an integer value
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(funzione) [edit]
converte una stringa in largo per un valore intero senza segno
Original:
converts a wide string to an unsigned integer value
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(funzione) [edit]
C documentation for wcstoimax, wcstoumax