io_req

A convenience bundle of precondition, data and where for reading into a T as specified by its to_asio_buffers() overload. Data MUST stay around until the operation completes.

Synopsis

template<class T>
struct io_req
      : public detail::io_req_impl< false >
{
  future precondition;                          // A precondition containing an open file handle for this operation. 
  std::vector< asio::mutable_buffer > buffers;  // A sequence of mutable Boost.ASIO buffers to read into. 
  off_t where;                                  // The offset from which to read. 
};

Template parameter(s)

Parameter	Description
class T	Any readable (if const) or writable (if non-const) type T as specified by its to_asio_buffers() overload.

Constructor(s)

Function	Description	Parameters
io_req()	Default constructor.
io_req(const io_req & o)	Copy constructor.	const io_req &: o:
io_req(io_req && o)	Move constructor.	io_req &&: o:
io_req(future<> _precondition, T * v, size_t _length, off_t _where)	Constructs an instance.	future<>: _precondition: An optional precondition for this operation T : v: A pointer to memory or reference to object into which to read or write size_t: _length: The number of items to transfer off_t: _where*: The offset at which to transfer
template<class U> io_req(future<> _precondition, U & v, off_t _where)	Constructs an instance.	future<>: _precondition: An optional precondition for this operation U &: v: A pointer to memory or reference to object into which to read or write off_t: _where: The offset at which to transfer
template<class U, size_t N> io_req(future<> _precondition, U(&) v, off_t _where)	Constructs an instance.	future<>: _precondition: An optional precondition for this operation U(&): v: A pointer to memory or reference to object into which to read or write off_t: _where: The offset at which to transfer

Member Function(s)

Function	Description	Parameters	Returns
bool validate()	Validates contents for correctness.		True if contents are correct
io_req & operator=(const io_req & o)	Copy assignment.	const io_req &: o:
io_req & operator=(io_req && o)	Move assignment.	io_req &&: o:

Header

#include <boost/afio/v2/afio.hpp>