std::stoul, std::stoull
Defined in header
<string>
|
||
unsigned long stoul( const std::string& str, std::size_t* pos = 0, int base = 10 );
unsigned long stoul( const std::wstring& str, std::size_t* pos = 0, int base = 10 ); |
(1) | (since C++11) |
unsigned long long stoull( const std::string& str, std::size_t* pos = 0, int base = 10 );
unsigned long long stoull( const std::wstring& str, std::size_t* pos = 0, int base = 10 ); |
(2) | (since C++11) |
Interprets an unsigned integer value in the string str
.
Function discards any whitespace characters (as identified by calling isspace()
) 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:
- (optional) prefix (
0
) indicating octal base (applies only when the base is 8 or 0) - (optional) prefix (
0x
or0X
) indicating hexadecimal base (applies only when the base is 16 or 0) - 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.
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 pos
is passed a value other than 0 or nullptr, then a pointer ptr
, internal to the conversion functions, will receive the address of the first unconverted character, and the index of that character will be calculated and stored in *pos
.
Contents |
[edit] Parameters
str | - | the string to convert |
pos | - | address of an integer to store the index of the first unconverted character |
base | - | the number base |
[edit] Return value
The string converted to the specified unsigned integer type.
[edit] Exceptions
- std::invalid_argument if no conversion could be performed
- std::out_of_range if the converted value would fall out of the range of the result type or if the underlying function (std::strtoul or std::strtoull) sets errno to ERANGE.
[edit] See also
(C++11)(C++11)(C++11)
|
converts a string to a signed integer (function) |
(C++11)(C++11)(C++11)
|
converts a string to a floating point value (function) |