fix backrefence bug

Author: Hana Dusíková

include/ctre/actions/backreference.inc.hpp

@@ -2,28 +2,28 @@
 #define CTRE__ACTIONS__BACKREFERENCE__HPP
 
 // backreference with name
-template <auto... Str, auto V, typename... Ts, size_t Counter> static constexpr auto apply(pcre::make_back_reference, ctll::term<V>, pcre_context<ctll::list<id<Str...>, Ts...>, pcre_parameters<Counter>> subject) {	
-	return pcre_context{ctll::push_front(back_reference_with_name<id<Str...>>(), ctll::list<Ts...>()), subject};
+template <auto... Str, auto V, typename... Ts, size_t Counter> static constexpr auto apply(pcre::make_back_reference, ctll::term<V>, pcre_context<ctll::list<id<Str...>, Ts...>, pcre_parameters<Counter>>) {	
+	return pcre_context{ctll::push_front(back_reference_with_name<id<Str...>>(), ctll::list<Ts...>()), pcre_parameters<Counter>()};
 }
 
 // with just a number
-template <auto V, size_t Id, typename... Ts, size_t Counter> static constexpr auto apply(pcre::make_back_reference, ctll::term<V>, pcre_context<ctll::list<number<Id>, Ts...>, pcre_parameters<Counter>> subject) {
+template <auto V, size_t Id, typename... Ts, size_t Counter> static constexpr auto apply(pcre::make_back_reference, ctll::term<V>, pcre_context<ctll::list<number<Id>, Ts...>, pcre_parameters<Counter>>) {
 	// if we are looking outside of existing list of Ids ... reject input during parsing
 	if constexpr (Counter < Id) {
 		return ctll::reject{};
 	} else {
-		return pcre_context{ctll::push_front(back_reference<Id>(), ctll::list<Ts...>()), subject};
+		return pcre_context{ctll::push_front(back_reference<Id>(), ctll::list<Ts...>()), pcre_parameters<Counter>()};
 	}
 }
 
 // relative backreference
-template <auto V, size_t Id, typename... Ts, size_t Counter> static constexpr auto apply(pcre::make_relative_back_reference, ctll::term<V>, [[maybe_unused]] pcre_context<ctll::list<number<Id>, Ts...>, pcre_parameters<Counter>> subject) {	
+template <auto V, size_t Id, typename... Ts, size_t Counter> static constexpr auto apply(pcre::make_relative_back_reference, ctll::term<V>, [[maybe_unused]] pcre_context<ctll::list<number<Id>, Ts...>, pcre_parameters<Counter>>) {	
 	// if we are looking outside of existing list of Ids ... reject input during parsing
 	if constexpr (Counter < Id) {
 		return ctll::reject{};
 	} else {
 		constexpr size_t absolute_id = (Counter + 1) - Id;
-		return pcre_context{ctll::push_front(back_reference<absolute_id>(), ctll::list<Ts...>()), subject};
+		return pcre_context{ctll::push_front(back_reference<absolute_id>(), ctll::list<Ts...>()), pcre_parameters<Counter>()};
 	}
 }
 

tests/generating.cpp

@@ -136,7 +136,7 @@ static_assert(same_f("((?:a)(b))"_ctre_gen, ctre::capture<1,ctre::character<'a'>
 // backreference
 static_assert(same_f("(a)\\g{1}"_ctre_gen, ctre::sequence<ctre::capture<1,ctre::character<'a'>>, ctre::back_reference<1>>()));
 static_assert(same_f("(?<ab>a)\\g{ab}"_ctre_gen, ctre::sequence<ctre::capture_with_name<1,ctre::id<'a','b'>,ctre::character<'a'>>, ctre::back_reference_with_name<ctre::id<'a','b'>>>()));
-
+static_assert(same_f("((a)\\g{2})"_ctre_gen, ctre::capture<1, ctre::capture<2,ctre::character<'a'>>, ctre::back_reference<2>>()));
 
 // asserts
 static_assert(same_f("^"_ctre_gen, ctre::assert_begin()));