21 Strings library [strings]

21.3 String classes [string.classes]

21.3.2 Class template basic_­string [basic.string]

21.3.2.7 String operations [string.ops]

21.3.2.7.5 basic_­string​::​starts_­with [string.starts.with]

bool starts_with(basic_string_view<charT, traits> x) const noexcept; bool starts_with(charT x) const noexcept; bool starts_with(const charT* x) const;
Effects: Equivalent to:
return basic_string_view<charT, traits>(data(), size()).starts_with(x);