std::literals::string_literals::operator""s
From cppreference.com
< cpp | string | basic string
Defined in header
<string>
|
||
string operator "" s(const char *str, std::size_t len);
|
(1) | (since C++14) |
u16string operator "" s(const char16_t *str, std::size_t len);
|
(2) | (since C++14) |
u32string operator "" s(const char32_t *str, std::size_t len);
|
(3) | (since C++14) |
wstring operator "" s(const wchar_t *str, std::size_t len);
|
(4) | (since C++14) |
Forms a string literal of the desired type.
1) returns std::string{str, len}
2) returns std::u16string{str, len}
3) returns std::u32string{str, len}
4) returns std::wstring{str, len}
Contents |
[edit] Parameters
str | - | pointer to the beginning of the raw character array literal |
len | - | length of the raw character array literal |
[edit] Return value
The string literal.
[edit] Notes
These operators are declared in the namespace std::literals::string_literals
, where both literals
and string_literals
are inline namespaces. Access to these operators can be gained with using namespace std::literals, using namespace std::string_literals, and using namespace std::literals::string_literals.
std::chrono::duration also defines operator""s
, to represent literal seconds, but it is an integer literal: 10s is ten seconds, but "10"s is a string.
[edit] Example
Run this code
#include <string> int main() { using namespace std::string_literals; std::string s2 = "abc\0\0def"; // forms the string "abc" std::string s1 = "abc\0\0def"s; // form the string "abc\0\0def" }
[edit] See also
constructs a basic_string (public member function) |