Method find_first_of

uspace/lib/cpp/include/__bits/string/string.hpp:1287–1290

            }

            size_type find_first_of(const basic_string& str, size_type pos = 0) const noexcept
            {
                return find_first_of(str.c_str(), pos, str.size());
            }

            size_type find_first_of(const value_type* str, size_type pos, size_type len) const noexcept
            {