std::literals::string_literals::operator""s
std::literals::string_literals::operator""s
Defined in header <string>
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(1) | (since C++14) |
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(2) | (since C++20) |
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(3) | (since C++14) |
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(4) | (since C++14) |
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(5) | (since C++14) |
Forms a string literal of the desired type.
1) returns std::string{str, len}
2) returns std::u8string{str, len}
3) returns std::u16string{str, len}
4) returns std::u32string{str, len}
5) returns std::wstring{str, len}
Parameters
str | - | pointer to the beginning of the raw character array literal |
len | - | length of the raw character array literal |
Return value
The string literal.
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 arithmetic literal: 10.0s
and 10s
are ten seconds, but "10"s
is a string.
Example
#include <string>
#include <iostream>
int main()
{
using namespace std::string_literals;
std::string s1 = "abc\0\0def";
std::string s2 = "abc\0\0def"s;
std::cout << "s1: " << s1.size() << " \"" << s1 << "\"\n";
std::cout << "s2: " << s2.size() << " \"" << s2 << "\"\n";
}
Possible output:
s1: 3 "abc"
s2: 8 "abc^@^@def"
See also
constructs a basic_string (public member function) |
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