1 files changed, 92 insertions, 0 deletions
diff --git a/libodb/odb/details/buffer.hxx b/libodb/odb/details/buffer.hxx
new file mode 100644
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+++ b/libodb/odb/details/buffer.hxx
@@ -0,0 +1,92 @@
+// file      : odb/details/buffer.hxx
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_BUFFER_DETAILS_HXX
+#define ODB_BUFFER_DETAILS_HXX
+
+#include <odb/pre.hxx>
+
+#include <new>
+#include <cstddef> // std::size_t
+
+#include <odb/details/export.hxx>
+
+namespace odb
+{
+  namespace details
+  {
+    class LIBODB_EXPORT basic_buffer_base
+    {
+    public:
+      ~basic_buffer_base ()
+      {
+        if (data_ != 0)
+          operator delete (data_);
+      }
+
+      basic_buffer_base (std::size_t capacity)
+        : capacity_ (capacity)
+      {
+        data_ = capacity_ == 0 ? 0 : operator new (capacity_);
+      }
+
+      std::size_t
+      capacity () const
+      {
+        return capacity_;
+      }
+
+      void
+      capacity (std::size_t, std::size_t data_size = 0);
+
+    protected:
+      void* data_;
+      std::size_t capacity_;
+    };
+
+    template <typename T>
+    class basic_buffer: public basic_buffer_base
+    {
+    public:
+      basic_buffer (std::size_t capacity = 256)
+          : basic_buffer_base (capacity)
+      {
+      }
+
+      T*
+      data ()
+      {
+        return static_cast<T*> (data_);
+      }
+
+      const T*
+      data () const
+      {
+        return static_cast<T*> (data_);
+      }
+
+      // Note that strictly speaking the return type should be void* const*
+      // but that would make using this function too awkward since we often
+      // store the result as void*.
+      //
+      void**
+      data_ptr ()
+      {
+        return &data_;
+      }
+
+      const void* const*
+      data_ptr () const
+      {
+        return &data_;
+      }
+    };
+
+    typedef basic_buffer<char> buffer;
+    typedef basic_buffer<unsigned char> ubuffer;
+  }
+}
+
+#include <odb/post.hxx>
+
+#endif // ODB_BUFFER_DETAILS_HXX