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std::wcstoimax, std::wcstoumax

Da cppreference.com
< cpp‎ | string‎ | wide

 
 
Biblioteca cordas
Strings terminadas
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Null-terminated strings
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Cadeias de bytes
Multibyte cordas
Cordas de largura
Classes
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Classes
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basic_string
char_traits
 
Strings terminadas largura
Funções
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Functions
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Manipulação personagem
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Character manipulation
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Conversões para formatos numéricos
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Conversions to numeric formats
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Manipulação de cadeia
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String manipulation
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Manipulação matriz
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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);
(a partir do C++ 11)
std::uintmax_t wcstoumax( const wchar_t* nptr, wchar_t** endptr, int base);
(a partir do C++ 11)
Interpreta um valor inteiro sem sinal em uma cadeia ampla apontado por 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

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

As funções define o ponteiro apontado pelo endptr para apontar para o caractere largo passado o último personagem interpretado. Se endptr é NULL, ele é ignorado.
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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Índice

[editar] Parâmetros

nptr -
ponteiro para a string terminada em null amplo para ser interpretado
Original:
pointer to the null-terminated wide string to be interpreted
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endptr -
ponteiro para um ponteiro para um caractere largo .
Original:
pointer to a pointer to a wide character.
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base -
Base do valor inteiro interpretado
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base of the interpreted integer value
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[editar] Valor de retorno

Valor inteiro correspondente ao conteúdo do str em caso de sucesso. Se o valor convertido cai fora do alcance do tipo de retorno correspondente, o erro ocorre e intervalo INTMAX_MAX, INTMAX_MIN, UINTMAX_MAX, ou 0 é devolvido, conforme o caso. Se nenhuma conversão pode ser executada, é devolvido 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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[editar] Exemplo

#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

[editar] Veja também

(C++11)
(C++11)
converte uma seqüência de byte para std::intmax_t ou std::uintmax_t
Original:
converts a byte string to std::intmax_t or std::uintmax_t
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(função) [edit]
converte uma cadeia de largura para um valor inteiro
Original:
converts a wide string to an integer value
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(função) [edit]
converte uma cadeia ampla para um valor inteiro sem sinal
Original:
converts a wide string to an unsigned integer value
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(função) [edit]
C documentation for wcstoimax, wcstoumax