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std::wcstoimax,std::wcstoumax(3) | C++ Standard Libary | std::wcstoimax,std::wcstoumax(3) |

# NAME¶

std::wcstoimax,std::wcstoumax - std::wcstoimax,std::wcstoumax

# Synopsis¶

Defined in header <cinttypes>

std::intmax_t wcstoimax( const wchar_t* nptr, wchar_t** endptr, int *(since
C++11)*

base );

std::uintmax_t wcstoumax( const wchar_t* nptr, wchar_t** endptr, int
*(since C++11)*

base );

Interprets an unsigned integer value in a wide string pointed to by nptr.

Discards any whitespace characters (as identified by calling std::iswspace)
until

the first non-whitespace character is found, then 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:

* (optional) plus or minus sign

* (optional) prefix **(0)** indicating octal base (applies only when the
base is 8 or

0)

* (optional) prefix (0x or 0X) indicating hexadecimal base (applies only when
the

base is 16 or 0)

* a sequence of digits

The set of valid values for base is {0,2,3,...,36}. The set of valid digits
for

base-2 integers is {0,1}, for base-3 integers is {0,1,2}, 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.

Additional numeric formats may be accepted by the currently installed C
locale.

If the value of base is 0, the numeric base is auto-detected: if the prefix
is

0, the base is octal, if the prefix is 0x or 0X, the base is hexadecimal,
otherwise

the base is decimal.

If the minus sign was part of the input sequence, the numeric value
calculated from

the sequence of digits is negated as if by unary minus in the result type,
which

applies unsigned integer wraparound rules.

The functions sets the pointer pointed to by endptr to point to the wide
character

past the last character interpreted. If endptr is a null pointer, it is
ignored.

# Parameters¶

nptr - pointer to the null-terminated wide string to be
interpreted

endptr - pointer to a pointer to a wide character.

base - base of the interpreted integer value

# Return value¶

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.

# Example¶

// Run this code

#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

# See also¶

strtoimax

strtoumax converts a byte string to std::intmax_t or std::uintmax_t

*(C++11)* *(function)*

*(C++11)*

wcstol converts a wide string to an integer value

wcstoll *(function)*

wcstoul converts a wide string to an unsigned integer value

wcstoull *(function)*

2022.07.31 | http://cppreference.com |