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#### null_buffers::value_type

The type for each element in the list of buffers.

    typedef mutable_buffer value_type;

###### Member Functions

Name | Description
--- | ---
mutable_buffer | Construct an empty buffer. Construct a buffer to represent a given memory range.

###### Related Functions

Name | Description
--- | ---
operator+ | Create a new modifiable buffer that is offset from the start of another.

The `mutable_buffer` class provides a safe representation of a buffer that can be modified. It does not own the underlying data, and so is cheap to copy or assign.

###### Accessing Buffer Contents

The contents of a buffer may be accessed using the `buffer_size` and `buffer_cast` functions:

    boost::asio::mutable_buffer b1 = ...;
    std::size_t s1 = boost::asio::buffer_size(b1);
    unsigned char* p1 = boost::asio::buffer_cast<unsigned char*>(b1);

The `boost::asio::buffer_cast` function permits violations of type safety, so uses of it in application code should be carefully considered.

###### Requirements

Header: `boost/asio/buffer.hpp`

Convenience header: `boost/asio.hpp`