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[string.starts.with]

27 Strings library [strings]

27.4 String classes [string.classes]

27.4.3 Class template basic_string [basic.string]

27.4.3.8 String operations [string.ops]

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

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constexpr bool starts_with(basic_string_view<charT, traits> x) const noexcept; constexpr bool starts_with(charT x) const noexcept; constexpr bool starts_with(const charT* x) const;

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