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std::strtoimax, std::strtoumax

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C++
 
Строки
 
Нульзаканчивающихся строк байт
Функции
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Functions
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Персонаж манипуляции
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Character manipulation
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Преобразование в цифровой формат
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Conversions to numeric formats
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Строками
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String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
Струнный экспертизы
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String examination
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Память манипуляции
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Memory manipulation
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memchr
memcmp
memset
memcpy
memmove
Разное
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Miscellaneous
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strerror
 
Заголовочный файл <cinttypes>
std::intmax_t strtoimax(const char* nptr, char** endptr, int base);
 (начиная с C++11)
std::uintmax_t strtoumax(const char* nptr, char** endptr, int base);
 (начиная с C++11)
Интерпретирует целое значение в строку байт, на который указывает nptr.
Original:
Interprets an integer value in a byte 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) integer number representation and converts them to an integer value. The valid integer value consists of the following parts:

  • (необязательно) plus or minus sign
  • (необязательно) prefix (0) indicating octal base (applies only when the base is 8)
  • (необязательно) 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.

Функции устанавливает указатель на которую указывает endptr чтобы она указывала на символ после последнего символа интерпретируются. Если endptr является NULL, он игнорируется.
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The functions sets the pointer pointed to by endptr to point to the character past the last character interpreted. If endptr is NULL, it is ignored.
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Если nptr пуст или не иметь ожидаемого форму, преобразование не выполняется, и (если enptr не NULL) значение nptr хранится в объекте, на который указывает endptr.
Original:
If the nptr is empty or does not have the expected form, no conversion is performed, and (if enptr is not NULL) the value of nptr is stored in the object pointed to by endptr.
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Содержание

[править] Параметры

nptr -
указатель с нулевым байтом строки должны интерпретироваться
Original:
pointer to the null-terminated byte string to be interpreted
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endptr -
Указатель на указатель на символ .
Original:
pointer to a pointer to character.
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base -
' Из базы интерпретировать целое значение
Original:
base of the interpreted integer value
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[править] Возвращаемое значение

  • В случае успеха, целое значение, соответствующее содержание str возвращается.
    Original:
    If successful, an integer value corresponding to the contents of str is returned.
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  • Если преобразованное значение выпадает из диапазона соответствующий тип возвращения, диапазон ошибки (настройка errno в ERANGE) и INTMAX_MAX, INTMAX_MIN, UINTMAX_MAX или ​0​ возвращается, в случае необходимости.
    Original:
    If the converted value falls out of range of corresponding return type, a range error occurs (setting errno to ERANGE) and INTMAX_MAX, INTMAX_MIN, UINTMAX_MAX or ​0​ is returned, as appropriate.
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  • Если преобразование не может быть выполнено, ​0​ возвращается.
    Original:
    If no conversion can be performed, ​0​ is returned.
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[править] Пример

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

Вывод: 

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

[править] См. также

(C++11)
(C++11)
преобразует широкий строку std::intmax_t или std::uintmax_t
Original:
converts a wide string to std::intmax_t or std::uintmax_t
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(функция) [edit]
преобразует байт строку в целое число
Original:
converts a byte string to an integer value
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(функция) [edit]
преобразует байт строку в целое число без знака
Original:
converts a byte string to an unsigned integer value
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(функция) [edit]
C документация для strtoimax, strtoumax
Источник — «http://ru.cppreference.com/mwiki/index.php?title=cpp/string/byte/strtoimax&oldid=31261»