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std::wcstol,std::wcstoll(3) | C++ Standard Libary | std::wcstol,std::wcstoll(3) |

# NAME¶

std::wcstol,std::wcstoll - std::wcstol,std::wcstoll

# Synopsis¶

Defined in header <cwchar>

long wcstol( const wchar_t* str, wchar_t** str_end, int base );

long long wcstoll( const wchar_t* str, wchar_t** str_end, int base );
*(since C++11)*

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

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) integer number representation
and

converts them to an integer value. The valid 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.

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

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

# Parameters¶

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

str_end - pointer to a pointer to 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

LONG_MAX, LONG_MIN, LLONG_MAX or LLONG_MIN is returned. If no conversion can
be

performed, 0 is returned.

# Example¶

// Run this code

#include <iostream>

#include <string>

#include <errno.h>

#include <cwchar>

int main()

{

const wchar_t* p = L"10 200000000000000000000000000000 30 -40";

wchar_t *end;

std::wcout << "Parsing L'" << p <<
"':\n";

for (long i = std::wcstol(p, &end, 10);

p != end;

i = std::wcstol(p, &end, 10))

{

std::wcout << "'" << std::wstring(p, end-p) <<
"' -> ";

p = end;

if (errno == ERANGE){

std::wcout << "range error, got ";

errno = 0;

}

std::wcout << i << '\n';

}

}

# Possible output:¶

Parsing L'10 200000000000000000000000000000 30 -40':

'10' -> 10

' 200000000000000000000000000000' -> range error, got 9223372036854775807

' 30' -> 30

' -40' -> -40

# See also¶

strtol converts a byte string to an integer value

strtoll *(function)*

*(C++11)*

wcstoul converts a wide string to an unsigned integer value

wcstoull *(function)*

2022.07.31 | http://cppreference.com |