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

1) Default constructor. Constructs an empty basic_string_view .

2) Copy constructor. Constructs a view of the same content as other .

3) Constructs a view of the first str. size ( ) characters of the character array starting with the element pointed by str. data ( ) .

4) Constructs a view of the first count characters of the character array starting with the element pointed by s . s can contain null characters. The behavior is undefined if [ s , s + count ) is not a valid range (even though the constructor may not access any of the elements of this range).

5) Constructs a view of the null-terminated character string pointed to by s , not including the terminating null character. The length of the view is determined as if by Traits :: length ( s ) . The behavior is undefined if [ s , s + Traits :: length ( s ) ) is not a valid range (even though the constructor may not access any of the elements of this range).

4,5) Throws nothing.

1-4) Constant.

5) Linear in length of s .

#include <experimental/string_view>
#include <iostream>
 
int main()
{
    std::string cppstr = "Foo";
    char array[3] = {'B', 'a', 'r'};
 
    std::experimental::string_view cppstr_v(cppstr);
    std::experimental::string_view array_v(array, sizeof array);
 
    std::experimental::wstring_view wcstr_v = L"xyzzy";
 
    std::cout << cppstr_v << '\n'
              << array_v << '\n'
              << wcstr_v.size() << '\n';
}

Foo
Bar
5