#include <ozo/connection.h>

Description

Connection source concept

ConnectionSource concept represents a type that creates a connection object with an established connection to a database. The connection source is the IO execution context agnostic entity. ConnectionSource is used by the ozo::connection_provider or other ConnectionSource models like ozo::connection_pool. Typically there is no need to use it directly.

Concrete models

ozo::connection_info, ozo::connection_pool, ozo::failover::role_based_connection_source.

Definition

Connection source s is an object of type S for which these next requirements are valid:

Expression	Type	Description
s(io, t, h)		Should invoke a continuation object `h` within time-limited by `t` (if not `ozo::none` specified) with a connection object associated with an executor object of the `io` execution context or/and `error_code` in case of failure. If there is no error_code code set, the connection object should be in a valid state.
ozo::connection_type<S>	deduced type	Should return the `Connection` object type that is produced by the source.
ozo::Connection<ozo::connection_type<S>>	`std::true_type`	Should provide a connection type that models the `Connection` concept.

Where:

io execution context object with type ozo::io_context,
t is the TimeConstraint model object,
h is callable with void(ozo::error_code, ozo::connection_type<S>) signature.

Note: The connection source should be an IO execution context agnostic entity.