Literal operator for creating const_buffer objects from string literals.

const_buffer operator""_buf(
    const char * data,
    std::size_t n);
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Literal operator for creating const_buffer objects from unbounded binary or hexadecimal integer literals.

template<
    char... Chars>
const_buffer operator""_buf();
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Requirements

Header: asio/buffer.hpp

Convenience header: asio.hpp