ozo::get_connection_type< ConnectionProvider > Struct Template Reference

#include <ozo/connection.h>

Description

template<typename ConnectionProvider>
struct ozo::get_connection_type< ConnectionProvider >

Connection type getter

This type describes the connection type from ConnectionProvider or ConnectionSource.

Template Parameters

ConnectionProvider

- connection provider type to get Connection type from.

By default it assumes on ConnectionProvider::connection_type type, if no nested type connection_type is found no inner type type. The implementation example (exposition only):

template <typename T, typename = void>
struct get_connection_type_default {};
 
template <typename T>
struct get_connection_type_default<T,
        std::void_t<typename T::connection_type> {
    using type = typename T::connection_type;
};
 
template <typename T>
struct get_connection_type : get_connection_type_default<T>{};

Customization point

Here you can specify how to obtain Connection type from the custom ConnectionProvider. E.g. for custom Connection implementation which is used via pointer the specialization can be:

template <>
struct get_connection_type<MyConnection*> {
    using type = MyConnection*;
};