NAME¶

std::experimental::basic_string_view::basic_string_view - std::experimental::basic_string_view::basic_string_view

Synopsis¶

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

// 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¶

operator= assigns a view
(public member function)

Category:¶

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