std::experimental::basic_string_view<CharT,Traits>::basic_string_view
From cppreference.com
< cpp | experimental | basic string view
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
)
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)
)
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
Run this code
#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:
Foo Bar 5
See also
| assigns a view (public member function) |