lut_chars Constructor Synopsis constexpr lut_chars(const char* s) noexcept; Defined in file <include/boost/url/grammar/lut_chars.hpp> on line 188 Description This function constructs a character set which has as members, all of the characters present in the null-terminated string s. Example constexpr lut_chars digits = "0123456789"; Complexity Linear in ::strlen(s), or constant if s is a constant expression. Exception Safety Throws nothing.