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std::basic_...string_view(3) C++ Standard Libary std::basic_...string_view(3) NAME std::basic_string::operatorbasic_string_view - std::basic_string::oper- atorbasic_string_view Synopsis operator std::basic_string_view<CharT, Traits>() const noexcept; (since C++17) (un- til C++20) constexpr operator std::basic_string_view<CharT, Traits>() const (since C++20) noexcept; Returns a std::basic_string_view, constructed as if by std::ba- sic_string_view<CharT, Traits>(data(), size()) Parameters (none) Return value A string view representing the entire contents of the string. Notes It is the programmer's responsibility to ensure that the resulting string view does not outlive the string. std::string get_string(); int f(std::string_view sv); int x = f(get_string()); // OK std::string_view sv = get_string(); // Bad: holds a dangling pointer Example // Run this code #include <iostream> #include <string> #include <string_view> void show_wstring_size(std::wstring_view wcstr_v) { std::cout << wcstr_v.size() << " code points\n"; } int main() { std::string cppstr = ""; // narrow string std::wstring wcstr = L""; // wide string // Implicit conversion from string to string_view // via std::string::operator string_view: std::string_view cppstr_v = cppstr; std::cout << cppstr_v << '\n' << cppstr_v.size() << " code units\n"; // Implicit conversion from wstring to wstring_view // via std::wstring::operator wstring_view: show_wstring_size(wcstr); } Output: 12 code units 4 code points See also constructor constructs a basic_string_view (C++17) (public member function of std::ba- sic_string_view<CharT,Traits>) http://cppreference.com 2022.07.31 std::basic_...string_view(3)
NAME | Synopsis | Parameters | Return value | Notes | Example | Output: | See also
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