From 5f821d47f0ee08a3a08962d0dc641326618dbf50 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 25 Apr 2011 12:30:05 +0200
Subject: Reuse container traits from composite values

---
 common/inheritance/driver.cxx |  4 ++++
 common/inheritance/test.hxx   | 20 ++++++++++++++++++--
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/common/inheritance/driver.cxx b/common/inheritance/driver.cxx
index 203e912..99dc1c5 100644
--- a/common/inheritance/driver.cxx
+++ b/common/inheritance/driver.cxx
@@ -29,6 +29,7 @@ main (int argc, char* argv[])
     auto_ptr<database> db (create_database (argc, argv));
 
     base b;
+    b.comp_.bools.push_back (true);
     b.comp_.num = 10;
     b.comp_.str = "comp bbb";
     b.comp_.nums.push_back (101);
@@ -39,6 +40,7 @@ main (int argc, char* argv[])
     b.strs_.push_back ("bbb two");
 
     object1 o1;
+    o1.comp_.bools.push_back (false);
     o1.comp_.num = 11;
     o1.comp_.str = "comp o1o1o1";
     o1.comp_.nums.push_back (111);
@@ -50,6 +52,8 @@ main (int argc, char* argv[])
     o1.strs_.push_back ("base o1o1o1 two");
 
     object2 o2;
+    o2.comp_.bools.push_back (true);
+    o2.comp_.bools.push_back (false);
     o2.comp_.num = 12;
     o2.comp_.str = "comp o2o2o2";
     o2.comp_.nums.push_back (121);
diff --git a/common/inheritance/test.hxx b/common/inheritance/test.hxx
index e27ff7a..31ef9c1 100644
--- a/common/inheritance/test.hxx
+++ b/common/inheritance/test.hxx
@@ -12,7 +12,19 @@
 #include <odb/core.hxx>
 
 #pragma db value
-struct comp
+struct comp_base
+{
+  std::vector<unsigned char> bools;
+
+  bool
+  operator== (const comp_base& y) const
+  {
+    return bools == y.bools;
+  }
+};
+
+#pragma db value
+struct comp: comp_base
 {
   unsigned int num;
   std::string str;
@@ -22,7 +34,11 @@ struct comp
   bool
   operator== (const comp& y) const
   {
-    return num == y.num && str == y.str && nums == y.nums;
+    return
+      static_cast<const comp_base&> (*this) == y &&
+      num == y.num &&
+      str == y.str &&
+      nums == y.nums;
   }
 };
 
-- 
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