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std::experimental::basic_string_view::basic_string_view

From cppreference.com
 
 
Technical specifications
Filesystem library (filesystem TS)
Library fundamentals (library fundamentals TS)
Library fundamentals 2 (library fundamentals 2 TS)
Extensions for parallelism (parallelism TS)
Extensions for concurrency (concurrency TS)
Concepts (concepts TS)
Ranges (ranges TS)
Special mathematical functions (special math TR)
 
 
 
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)

Contents

[edit] 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

[edit] Exceptions

4-5) (none)

[edit] Complexity

1-4) constant
5) linear in length of s

[edit] Example

#include <iostream>
#include <experimental/string_view>
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:

Foo
Bar
5

[edit] See also

assigns a view
(public member function) [edit]