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std::experimental::basic_string_view<CharT,Traits>::basic_string_view - cppreference.com

From cppreference.com

constexpr basic_string_view() noexcept;
(1) (library fundamentals TS) 
constexpr basic_string_view( const basic_string_view& other ) noexcept = default;
(2) (library fundamentals TS) 
template<class Allocator>
basic_string_view( const std::basic_string<CharT, Traits, Allocator>& str ) noexcept;
(3) (library fundamentals TS) 
constexpr basic_string_view( const CharT* s, size_type count );
(4) (library fundamentals TS) 
constexpr basic_string_view( const CharT* s );
(5) (library fundamentals TS)

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).

Parameters

other - another view to initialize the view with
str - a C++ string object to initialize view with
s - pointer to a character array or a C string to initialize the view with
count - number of characters to include in the view

Exceptions

4,5) Throws nothing.

Complexity

1-4) Constant.

5) Linear in length of s.

Example

#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';
}

Output:

See also