The asio::dynamic_buffer function is used to create a dynamically resized buffer from a std::basic_string or std::vector.

template<
    typename Elem,
    typename Traits,
    typename Allocator>
dynamic_string_buffer< Elem, Traits, Allocator > dynamic_buffer(
    std::basic_string< Elem, Traits, Allocator > & data);
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template<
    typename Elem,
    typename Traits,
    typename Allocator>
dynamic_string_buffer< Elem, Traits, Allocator > dynamic_buffer(
    std::basic_string< Elem, Traits, Allocator > & data,
    std::size_t max_size);
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template<
    typename Elem,
    typename Allocator>
dynamic_vector_buffer< Elem, Allocator > dynamic_buffer(
    std::vector< Elem, Allocator > & data);
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template<
    typename Elem,
    typename Allocator>
dynamic_vector_buffer< Elem, Allocator > dynamic_buffer(
    std::vector< Elem, Allocator > & data,
    std::size_t max_size);
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Requirements

Header: asio/buffer.hpp

Convenience header: asio.hpp