From 2b8a36aa97c9f2a2146a5e6fb7b681e1e51dd5b0 Mon Sep 17 00:00:00 2001
From: rbock <rbock@eudoxos.de>
Date: Sun, 5 Jul 2015 13:53:38 +0200
Subject: [PATCH] Added support for empty in() and not_in()

I wonder why SQL does not have that anyway.
---
 include/sqlpp11/in.h     | 27 +++++++++++++++++++++++++++
 include/sqlpp11/not_in.h | 28 ++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)

diff --git a/include/sqlpp11/in.h b/include/sqlpp11/in.h
index 9628ee84..28d9901f 100644
--- a/include/sqlpp11/in.h
+++ b/include/sqlpp11/in.h
@@ -95,6 +95,33 @@ namespace sqlpp
 			}
 		};
 
+	template<typename Container>
+		struct value_list_t;
+
+	template<typename Context, typename Operand, typename Container>
+		struct serializer_t<Context, in_t<Operand,  value_list_t<Container>>>
+		{
+			using _serialize_check = serialize_check_of<Context, value_list_t<Container>>;
+			using T = in_t<Operand, value_list_t<Container>>;
+
+			static Context& _(const T& t, Context& context)
+			{
+				const auto& value_list = std::get<0>(t._args);
+				if (value_list._container.empty())
+				{
+					context << " 'operand in empty list' = 'false' ";
+				}
+				else
+				{
+					serialize(t._operand, context);
+					context << " IN(";
+					serialize(value_list, context);
+					context << ')';
+				}
+				return context;
+			}
+		};
+
 }
 
 #endif
diff --git a/include/sqlpp11/not_in.h b/include/sqlpp11/not_in.h
index c42edc70..d230d815 100644
--- a/include/sqlpp11/not_in.h
+++ b/include/sqlpp11/not_in.h
@@ -95,6 +95,34 @@ namespace sqlpp
 			}
 		};
 
+	template<typename Container>
+		struct value_list_t;
+
+	template<typename Context, typename Operand, typename Container>
+		struct serializer_t<Context, not_in_t<Operand,  value_list_t<Container>>>
+		{
+			using _serialize_check = serialize_check_of<Context, value_list_t<Container>>;
+			using T = not_in_t<Operand, value_list_t<Container>>;
+
+			static Context& _(const T& t, Context& context)
+			{
+				const auto& value_list = std::get<0>(t._args);
+				if (value_list._container.empty())
+				{
+					context << " 'operand not in empty list' != 'false' ";
+				}
+				else
+				{
+					serialize(t._operand, context);
+					context << " NOT IN(";
+					serialize(value_list, context);
+					context << ')';
+				}
+				return context;
+			}
+		};
+
+
 }
 
 #endif