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std::basic_...emove_prefix(3) C++ Standard Libarystd::basic_...emove_prefix(3) NAME std::basic_string_view::remove_prefix - std::basic_string_view::re- move_prefix Synopsis constexpr void remove_prefix( size_type n ); (since C++17) Moves the start of the view forward by n characters. The behavior is undefined if n > size(). Parameters n - number of characters to remove from the start of the view Return value (none) Complexity Constant. Example // Run this code #include <algorithm> #include <iostream> #include <string_view> using namespace std::literals; [[nodiscard("a pure function")]] constexpr std::size_t count_substrings(std::string_view hive, std::string_view const bee) { if (hive.empty() || bee.empty()) return 0U; std::size_t buzz{}; while (bee.size() <= hive.size()) { const auto pos = hive.find(bee); if (pos == hive.npos) break; ++buzz; hive.remove_prefix(pos + bee.size()); } return buzz; } int main() { std::string str = " trim me"; std::string_view v = str; v.remove_prefix(std::min(v.find_first_not_of(" "), v.size())); std::cout << "String: '" << str << "'\n" << "View : '" << v << "'\n"; constexpr auto hive{"bee buzz bee buzz bee"}; std::cout << "There are " << count_substrings(hive, "bee") << " bees in this hive.\n"; } Output: String: ' trim me' View : 'trim me' There are 3 bees in this hive. See also remove_suffix shrinks the view by moving its end backward (public member function) http://cppreference.com 2024.06.10 std::basic_...emove_prefix(3)
NAME | Synopsis | Parameters | Return value | Complexity | Example | Output: | See also
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