Hi, As far as I understand the currently available plugin extension points, it is not possible to modify template argument deduction algorithm (except the theoretical possibility to completely override parsing step). However, such opportunity might be beneficial for projects like libpqxx, for example, when database schema and query text are available at compile-time, return types of the query might be inferred by the plugin.
I propose to add something like PLUGIN_FUNCTION_CALL plugin_event which will allow to modify function calls conditionally. Will a patch adding such functionality be welcomed? Thanks, Dan Klishch