Constant buffer sequence requirements

A constant buffer sequence represents a set of memory regions that may be used as input to an operation, such as the send operation of a socket.

A type X meets the ConstBufferSequence requirements if it satisfies the requirements of Destructible (C++Std [destructible]) and CopyConstructible (C++Std [copyconstructible]), as well as the additional requirements listed below.

In the table below, x denotes a (possibly const) value of type X , and u denotes an identifier.

Table 11. ConstBufferSequence requirements

expression	return type	assertion/note pre/post-condition
`boost :: asio :: buffer_sequence_begin ( x )` `boost :: asio :: buffer_sequence_end ( x )`	An iterator type meeting the requirements for bidirectional iterators (C++Std [bidirectional.iterators]) whose value type is convertible to `const_buffer` .
X u(x);		post: equal( boost::asio::buffer_sequence_begin(x), boost::asio::buffer_sequence_end(x), boost::asio::buffer_sequence_begin(u), boost::asio::buffer_sequence_end(u), [](const const_buffer& b1, const const_buffer& b2) { return b1.data() == b2.data() && b1.size() == b2.size(); })

expression

return type

assertion/note
pre/post-condition

boost :: asio :: buffer_sequence_begin ( x )
boost :: asio :: buffer_sequence_end ( x )

An iterator type meeting the requirements for bidirectional iterators (C++Std [bidirectional.iterators]) whose value type is convertible to const_buffer .

X u(x);

post:

equal(
  boost::asio::buffer_sequence_begin(x),
  boost::asio::buffer_sequence_end(x),
  boost::asio::buffer_sequence_begin(u),
  boost::asio::buffer_sequence_end(u),
  [](const const_buffer& b1,
     const const_buffer& b2)
   {
     return b1.data() == b2.data()
         && b1.size() == b2.size();
   })

Boost C++ Libraries

Constant buffer sequence requirements