X-Git-Url: http://g0dil.de/git?a=blobdiff_plain;f=Packets%2FPacketImpl.hh;h=667eebb151ec9e237711d89891ac433b4b6109a9;hb=7a5841bb928db440280cf91bbb3ea0230fd0e911;hp=871b9ec5948f9b377595a8e54be21b78a523f215;hpb=a1a6c76a214ad1935032826713cabaf9ac57bf07;p=senf.git

diff --git a/Packets/PacketImpl.hh b/Packets/PacketImpl.hh
index 871b9ec..667eebb 100644
--- a/Packets/PacketImpl.hh
+++ b/Packets/PacketImpl.hh
@@ -28,16 +28,96 @@
 
 // Custom includes
 #include <memory>
+#include <vector>
 #include <boost/utility.hpp>
+#include <boost/type_traits/is_base_of.hpp>
+#include <boost/type_traits/has_trivial_constructor.hpp>
+#include <boost/type_traits/has_trivial_destructor.hpp>
+#include <boost/static_assert.hpp>
 #include "../Utils/pool_alloc_mixin.hh"
 #include "PacketTypes.hh"
+#include "../Utils/singleton.hh"
 
 //#include "PacketImpl.mpp"
 ///////////////////////////////hh.p////////////////////////////////////////
 
 namespace senf {
+
+    /** \brief Marker base-class for complex annotations
+
+        This class is used as a base class to mark an annotation type as complex. A complex
+        annotation will have it's constructor/destructor called. Non-complex annotations will not
+        have their constructor called, they will be zero initialized. The destructor of non-complex
+        annotations is never called.
+
+        An annotation must be marked as complex if it is not <a
+        href="http://en.wikipedia.org/wiki/Plain_Old_Data_Structures">POD</a>. Simplified, an
+        annotation must be marked as ComplexAnnotation, if
+
+        \li it has a (user defined) constructor or destructor
+        \li it has any data members which have (user defined) constructors or destructors
+
+        \see \ref packet_usage_annotation
+     */
+    struct ComplexAnnotation {};
+
 namespace detail {
 
+    struct AnnotationP
+    {
+        virtual ~AnnotationP();
+    };
+
+    template <class Annotation>
+    struct TAnnotationP
+        : public AnnotationP
+    {
+        Annotation annotation;
+    };
+
+    union AnnotationEntry {
+        AnnotationP * p;
+        unsigned long long i;
+    };
+
+    struct AnnotationIndexerBase
+    {
+        static unsigned maxAnnotations;
+        static std::vector<bool> & small();
+    };
+
+    template <class Annotation>
+    struct AnnotationIndexer 
+        : public senf::singleton< AnnotationIndexer<Annotation> >, 
+          public AnnotationIndexerBase
+    {
+        AnnotationIndexer();
+        unsigned index_;
+        static unsigned index();
+        static bool const Complex = boost::is_base_of<ComplexAnnotation, Annotation>::value;
+        static bool const Small = (sizeof(Annotation) <= sizeof(AnnotationEntry) && ! Complex);
+
+#       ifdef BOOST_HAS_TYPE_TRAITS_INTRINSICS
+
+        BOOST_STATIC_ASSERT(( (boost::has_trivial_constructor<Annotation>::value 
+                               && boost::has_trivial_destructor<Annotation>::value)
+                              || Complex ));
+
+#       endif
+    };
+
+    template <class Annotation, bool Small = AnnotationIndexer<Annotation>::Small>
+    struct GetAnnotation
+    {
+        static Annotation & get(AnnotationEntry & e);
+    };
+
+    template <class Annotation>
+    struct GetAnnotation<Annotation, true>
+    {
+        static Annotation & get(AnnotationEntry & e);
+    };
+
     /** \brief Internal: Packet data storage
 
         \internal
@@ -103,6 +183,10 @@ namespace detail {
         void erase(PacketData * self, iterator first, iterator last);
         void clear(PacketData * self);
 
+        // Annotations
+        template <class Annotation>
+        Annotation & annotation();
+
         /** \brief Internal: Keep PacketImpl instance alive
 
             \internal
@@ -121,6 +205,9 @@ namespace detail {
         refcount_t refcount_;
         raw_container data_;
         interpreter_list interpreters_;
+        
+        typedef std::vector<AnnotationEntry> Annotations;
+        Annotations annotations_;
 
         void eraseInterpreters(interpreter_list::iterator b, interpreter_list::iterator e);
         void updateIterators(PacketData * self, difference_type pos, difference_type n);