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##### flat_static_buffer::prepare

Returns a mutable buffer sequence representing writable bytes.

###### Synopsis

    mutable_buffers_type
    prepare(
        std::size_t n);

###### Description

Returns a mutable buffer sequence representing the writable bytes containing exactly `n` bytes of storage.

All buffers sequences previously obtained using `data` or `prepare` are invalidated.

###### Parameters

Name | Description
--- | ---
`n` | The desired number of bytes in the returned buffer sequence.

###### Exceptions

Type | Thrown On
--- | ---
`std::length_error` | if `size()` + n exceeds `max_size()`.

###### Exception Safety

Strong guarantee.