std::basic_string_view<CharT,Traits>::basic_string_view

`constexpr basic_string_view() noexcept;`	(1)	( C++17)
`constexpr basic_string_view(const basic_string_view& other) noexcept = default;`	(2)	( C++17)
`constexpr basic_string_view(const CharT* s, size_type count);`	(3)	( C++17)
`constexpr basic_string_view(const CharT* s);`	(4)	( C++17)

1) -. basic_string_view. data() nullptr, size() 0.

2) . other. data() other.data(), size() other.size().

3) count , s. s \0 . , [s, s+count) ( ). data() s, size() count.

4) s, \0, \0 . Traits::length(s). , [s, s+Traits::length(s)) . , data() s, size() Traits::length(s).

other
s		-
count

1-3)

4) , s

#include <iostream>
#include <string>
#include <string_view>
int main()
{
    std::wstring_view wcstr_v = L"xyzzy";

    char array[3] = {'B', 'a', 'r'};
    std::string_view array_v(array, std::size(array));

    std::string cppstr = "Foo";
    std::string_view cppstr_v(cppstr); 

    std::cout << cppstr_v << '\n'
              << array_v << '\n'
              << wcstr_v.size() << '\n';
}

:

Foo
Bar
5

operator=

(C++17)

(public -) []







(C++20)

(C++20)
(C++11)





(C++20)


/

(C++11)
(C++11)
(C++11)
(C++17)

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std::basic_string_view<CharT,Traits>::basic_string_view