From 1fa74e93cbc6ec0cc8ca8e6b653d1b530c01744a Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 24 Jan 2013 15:10:21 +0200
Subject: Add support for mapping char[N] to CHAR/VARCHAR database types

Also improve query support for arrays (decaying).
---
 odb/query.hxx | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'odb/query.hxx')

diff --git a/odb/query.hxx b/odb/query.hxx
index adea4b3..67de520 100644
--- a/odb/query.hxx
+++ b/odb/query.hxx
@@ -51,6 +51,30 @@ namespace odb
     }
   };
 
+  // Query parameter decay traits.
+  //
+  template <typename T>
+  struct decay_traits
+  {
+    typedef const T& type;
+
+    static type
+    instance ();
+  };
+
+  template <typename T, std::size_t N>
+  struct decay_traits<T[N]>
+  {
+    typedef const T* type;
+
+    // Use the pointer comparability as a proxy for data comparability.
+    // Note that it is stricter than using element comparability (i.e.,
+    // one can compare int to char but not int* to char*).
+    //
+    static type
+    instance ();
+  };
+
   // VC9 cannot handle certain cases of non-type arguments with default
   // values in template functions (e.g., database::query()). As a result,
   // we have to use the impl trick below instead of simply having kind
-- 
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