cppgres::datumable_function Concept Reference

Function that operates on values of Postgres types. More...

#include <function.hpp>

Concept definition

template<typename Func>
concept cppgres::datumable_function = 
    requires { typename utils::function_traits::function_traits<Func>::argument_types; } &&
    all_from_nullable_datum<
        typename utils::function_traits::function_traits<Func>::argument_types>::value &&
    requires(Func f) {
      {
        std::apply(
            f,
            std::declval<typename utils::function_traits::function_traits<Func>::argument_types>())
      } -> convertible_into_nullable_datum_or_set_iterator_or_void;
    }

Detailed Description

Function that operates on values of Postgres types.

These functions take cppgres::convertible_from_nullable_datum arguments and returns cppgres::convertible_into_nullable_datum, or cppgres::datumable_iterator (for Set-Returning Functions).