Returns whether the string begins with s

BOOST_STATIC_STRING_CPP14_CONSTEXPR bool
starts_with(
    string_view_type s) const;
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Returns whether the string begins with c

BOOST_STATIC_STRING_CPP14_CONSTEXPR bool
starts_with(
    value_type c) const;
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BOOST_STATIC_STRING_CPP14_CONSTEXPR bool
starts_with(
    const_pointer s) const;
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