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)
`template<class It, class End> constexpr basic_string_view(It first, End last);`	(5)	(C++20)

1) basic_string_view data() nullptr size() 0

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

3) s count s [s, s+count) () data() s size() count

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

5) [first, last) basic_string_view [first, last) It contiguous_iterator End It sized_sentinel_for data() std::to_address(first) size() last - first

It contiguous_iterator
End It sized_sentinel_for
std::iter_value_t<It> CharT
End std::size_t

other	-
s	-	C
count	-
first	-
last	-

1-3,5)

4) s

Run this code

#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=

() [edit]






(C++20)





(C++20)




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

cppreference.com

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