constexpr basic_string_view() noexcept; | (1) | (since C++17) |
constexpr basic_string_view(const basic_string_view& other) noexcept = default; | (2) | (since C++17) |
constexpr basic_string_view(const CharT* s, size_type count); | (3) | (since C++17) |
constexpr basic_string_view(const CharT* s); | (4) | (since C++17) |
basic_string_view
. After construction, data()
is equal to nullptr
, and size()
is equal to 0
.other
. After construction, data()
is equal to other.data()
, and size()
is equal to other.size()
.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). After construction, data()
is equal to s
, and size()
is equal to count
.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. After construction, data()
is equal to s
, and size()
is equal to Traits::length(s)
.other | - | another view to initialize the 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 |
s
#include <iostream> #include <string> #include <string_view> int main() { std::wstring_view wcstr_v = L"xyzzy"; char array[3] = {'B', 'a', 'r'}; std::string_view array_v(array, std::size(array)); std::string cppstr = "Foo"; std::string_view cppstr_v(&cppstr[0], cppstr.size()); std::cout << cppstr_v << '\n' << array_v << '\n' << wcstr_v.size() << '\n'; }
Output:
Foo Bar 5
assigns a view (public member function) |
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