From 6591d38babccf96cdf395f70ca59a282633b2a39 Mon Sep 17 00:00:00 2001
From: rbock <rbock@eudoxos.de>
Date: Sat, 7 Mar 2015 09:40:06 +0100
Subject: [PATCH] Added table() method for columns.

---
 include/sqlpp11/column.h |  7 +++++++
 tests/SelectTest.cpp     | 12 ++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/include/sqlpp11/column.h b/include/sqlpp11/column.h
index 8a6911bc..bb0dd740 100644
--- a/include/sqlpp11/column.h
+++ b/include/sqlpp11/column.h
@@ -70,6 +70,13 @@ namespace sqlpp
 		column_t& operator=(column_t&&) = default;
 		~column_t() = default;
 
+		template<typename T = _table>
+		auto table() const -> _table
+		{
+			static_assert(is_table_t<T>::value, "cannot call get_table for columns of a sub-selects or cte");
+			return _table{};
+		}
+
 		template<typename alias_provider>
 			expression_alias_t<column_t, alias_provider> as(const alias_provider&) const
 			{
diff --git a/tests/SelectTest.cpp b/tests/SelectTest.cpp
index b804aee1..86ad502f 100644
--- a/tests/SelectTest.cpp
+++ b/tests/SelectTest.cpp
@@ -36,11 +36,23 @@
 MockDb db = {};
 MockDb::_serializer_context_t printer;
 
+template<typename Column>
+int64_t getColumn(const Column& column)
+{
+	auto result = db(select(column.as(sqlpp::a)).from(column.table()).where(true));
+	if (not result.empty())
+		return result.front().a;
+	else
+		return 0;
+}
+
 int main()
 {
 	test::TabFoo f; 
 	test::TabBar t;
 
+	getColumn(t.alpha);
+
 	for (const auto& row : db(select(all_of(t)).from(t).where(true)))
 	{
 		int64_t a = row.alpha;