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std::literals::string_view_literals::operator""sv

From cppreference.com
 
 
 
 
Defined in header <string_view>
constexpr string_view
    operator "" sv(const char* str, std::size_t len) noexcept;
(1) (since C++17)
constexpr u8string_view
    operator "" sv(const char8_t* str, std::size_t len) noexcept;
(2) (since C++20)
constexpr u16string_view
    operator "" sv(const char16_t* str, std::size_t len) noexcept;
(3) (since C++17)
constexpr u32string_view
    operator "" sv(const char32_t* str, std::size_t len) noexcept;
(4) (since C++17)
constexpr wstring_view
    operator "" sv(const wchar_t* str, std::size_t len) noexcept;
(5) (since C++17)

Forms a string view of a character literal.

1) returns std::string_view{str, len}
2) returns std::u8string_view{str, len}
3) returns std::u16string_view{str, len}
4) returns std::u32string_view{str, len}
5) returns std::wstring_view{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_view literal.

[edit] Notes

These operators are declared in the namespace std::literals::string_view_literals, where both literals and string_view_literals are inline namespaces. Access to these operators can be gained with using namespace std::literals, using namespace std::string_view_literals, and using namespace std::literals::string_view_literals.

[edit] Example

#include <string_view>
#include <iostream>
 
int main()
{
    using namespace std::literals;
 
    std::string_view s1 = "abc\0\0def";
    std::string_view s2 = "abc\0\0def"sv;
    std::cout << "s1: " << s1.size() << " \"" << s1 << "\"\n";
    std::cout << "s2: " << s2.size() << " \"" << s2 << "\"\n";
}

Possible output:

s1: 3 "abc"
s2: 8 "abc^@^@def"

[edit] See also

constructs a basic_string_view
(public member function) [edit]