starts_with Checks if the string begins with the given prefix Synopsis bool starts_with(string_view s) const noexcept; Declared in file <include/boost/url/decode_view.hpp> on line 357 Defined in file <src/decode_view.cpp> on line 137 Description Example assert( decode_view( "Program%20Files" ).starts_with("Program") ); Complexity Linear. Exception Safety Throws nothing.