Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Return whether the string begins with a string.

constexpr bool
starts_with(
    string_view_type s) const;
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constexpr bool
starts_with(
    const_pointer s) const;
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Return whether the string begins with a character.

constexpr bool
starts_with(
    value_type c) const;
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