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std::basic_...iew::substr(3) C++ Standard Libary std::basic_...iew::substr(3) NAME std::basic_string_view::substr - std::basic_string_view::substr Synopsis constexpr basic_string_view substr( size_type pos = 0, (since C++17) size_type count = npos ) const; Returns a view of the substring [pos, pos + rlen), where rlen is the smaller of count and size() - pos. Parameters pos - position of the first character count - requested length Return value View of the substring [pos, pos + rlen). Exceptions std::out_of_range if pos > size(). Complexity Constant. Example // Run this code #include <cstddef> #include <iostream> #include <stdexcept> #include <string_view> int main() { typedef std::size_t count_t, pos_t; constexpr std::string_view data{"ABCDEF"}; std::cout << data.substr() << '\n'; // ABCDEF, i.e. data[0, 5] that is [0, 6) std::cout << data.substr(pos_t(1)) << '\n'; // BCDEF, i.e. [1, 6) std::cout << data.substr(pos_t(2), count_t(3)) << '\n'; // CDE, i.e. [2, 2 + 3) std::cout << data.substr(pos_t(4), count_t(42)) << '\n'; // EF, i.e. [4, 6) try { [[maybe_unused]] auto sub = data.substr(pos_t(666), count_t(1)); // throws: pos > size() } catch (std::out_of_range const& ex) { std::cout << ex.what() << '\n'; } } Possible output: ABCDEF BCDEF CDE EF basic_string_view::substr: __pos (which is 666) > __size (which is 6) See also copy copies characters (public member function) find find characters in the view (public member function) substr returns a substring (public member function of std::basic_string<CharT,Traits,Al- locator>) http://cppreference.com 2024.06.10 std::basic_...iew::substr(3)
NAME | Synopsis | Parameters | Return value | Exceptions | Complexity | Example | Possible output: | See also
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