...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
A dynamic buffer encapsulates memory storage that may be automatically resized as required, where the memory is divided into an input sequence followed by an output sequence. These memory regions are internal to the dynamic buffer, but direct access to the elements is provided to permit them to be efficiently used with I/O operations, such as the send or receive operations of a socket. Data written to the output sequence of a dynamic buffer object is appended to the input sequence of the same object.
The interface to this concept is intended to permit the following implementation strategies:
flat_buffer
.
multi_buffer
.
boost::asio::is_dynamic_buffer
D
denotes a dynamic buffer
class.
a
denotes a value of
type D
.
c
denotes a (possibly
const) value of type D
.
n
denotes a value of
type std::size_t
.
T
denotes a type meeting
the requirements for ConstBufferSequence.
U
denotes a type meeting
the requirements for MutableBufferSequence.
Table 1.42. Valid expressions
Expression |
Type |
Semantics, Pre/Post-conditions |
---|---|---|
|
|
This type represents the memory associated with the input sequence. |
|
|
This type represents the memory associated with the output sequence. |
|
|
Returns the size, in bytes, of the input sequence. |
|
|
Returns the permitted maximum of the sum of the sizes of the input sequence and output sequence. |
|
|
Returns the maximum sum of the sizes of the input sequence and output sequence that the dynamic buffer can hold without requiring reallocation. |
|
|
Returns a constant buffer sequence u that represents the memory
associated with the input sequence, and where |
|
|
Returns a mutable buffer sequence u representing the output sequence,
and where
Throws: |
|
Appends |
|
|
Removes |