rpnx::querygraph::subquery_spec_c Concept Reference

Identifies a result class produced within a parent query node. More...

#include <querygraph.hpp>

Concept definition

template<typename T>
concept rpnx::querygraph::subquery_spec_c =  requires {
        typename T::parent_query;
        typename T::input_type;
        typename T::output_type;
        requires query_spec_c< typename T::parent_query >;
        { T::subquery_id } -> std::convertible_to< std::string >;
    }

Detailed Description

Identifies a result class produced within a parent query node.

A subquery specification provides parent_query, input_type, output_type, and a stable subquery_id. Unlike a top-level query, its instances are scoped to one input instance of the parent query.

Template Parameters

T	Candidate subquery specification.

Definition at line 149 of file querygraph.hpp.