From 37f5dcb1d34205aa4a395c1e21e853e363fd7f12 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 28 Jul 2011 09:45:36 +0200
Subject: Add value_traits specializations for std::vector<char>

This allows using it as a buffer for BLOB mapping.
---
 odb/sqlite/traits.cxx | 26 ++++++++++++++++++++++++++
 odb/sqlite/traits.hxx | 30 ++++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+)

diff --git a/odb/sqlite/traits.cxx b/odb/sqlite/traits.cxx
index e73462a..96e201d 100644
--- a/odb/sqlite/traits.cxx
+++ b/odb/sqlite/traits.cxx
@@ -15,8 +15,10 @@ namespace odb
   {
     using details::buffer;
 
+    //
     // default_value_traits<std::string>
     //
+
     void default_value_traits<string, id_text>::
     set_image (buffer& b,
                size_t& n,
@@ -33,8 +35,10 @@ namespace odb
         memcpy (b.data (), v.c_str (), n);
     }
 
+    //
     // default_value_traits<const char*>
     //
+
     void default_value_traits<const char*, id_text>::
     set_image (buffer& b,
                size_t& n,
@@ -50,5 +54,27 @@ namespace odb
       if (n != 0)
         memcpy (b.data (), v, n);
     }
+
+    //
+    // default_value_traits<vector<char>, id_blob>
+    //
+
+    void default_value_traits<vector<char>, id_blob>::
+    set_image (details::buffer& b,
+               size_t& n,
+               bool& is_null,
+               const value_type& v)
+    {
+      is_null = false;
+      n = v.size ();
+
+      if (n > b.capacity ())
+        b.capacity (n);
+
+      // std::vector::data() may not be available in older compilers.
+      //
+      if (n != 0)
+        memcpy (b.data (), &v[0], n);
+    }
   }
 }
diff --git a/odb/sqlite/traits.hxx b/odb/sqlite/traits.hxx
index 2fdac04..8863fb1 100644
--- a/odb/sqlite/traits.hxx
+++ b/odb/sqlite/traits.hxx
@@ -9,6 +9,7 @@
 #include <odb/pre.hxx>
 
 #include <string>
+#include <vector>
 #include <cstddef> // std::size_t
 
 #include <odb/traits.hxx>
@@ -132,6 +133,35 @@ namespace odb
                  const char*);
     };
 
+    // std::vector<char> (buffer) specialization.
+    //
+    template <>
+    struct LIBODB_SQLITE_EXPORT default_value_traits<std::vector<char>, id_blob>
+    {
+    public:
+      typedef std::vector<char> value_type;
+      typedef std::vector<char> query_type;
+      typedef details::buffer image_type;
+
+      static void
+      set_value (value_type& v,
+                 const details::buffer& b,
+                 std::size_t n,
+                 bool is_null)
+      {
+        if (!is_null)
+          v.assign (b.data (), b.data () + n);
+        else
+          v.clear ();
+      }
+
+      static void
+      set_image (details::buffer&,
+                 std::size_t& n,
+                 bool& is_null,
+                 const value_type&);
+    };
+
     //
     // type_traits
     //
-- 
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