0025261: NCollection, set of improvements

The following improvements were implemented:
* two additional allocators were introduced
  * Allocator which used WinHeap
  * Accumulating memory allocator
* Access to Allocators in lists are provided
* Access optimization in data map (seek and find functions returning reference or pointer to value in one shot)

Warning fixed

src/NCollection/NCollection_WinHeapAllocator.hxx

@@ -0,0 +1,58 @@
+// File:      NCollection_WinHeapAllocator.hxx
+// Created:   22.07.11
+// Author:    Kirill GAVRILOV
+// Copyright: Open Cascade 2011
+
+#ifndef NCollection_WinHeapAllocator_HeaderFile
+#define NCollection_WinHeapAllocator_HeaderFile
+
+#include <NCollection_BaseAllocator.hxx>
+
+//! This memory allocator creates dedicated heap for allocations.
+//! This technics available only on Windows platform
+//! (no alternative on Unix systems).
+//! It may be used to take control over memory fragmentation
+//! because on destruction ALL allocated memory will be released
+//! to the system.
+//!
+//! This allocator can also be created per each working thread
+//! hovewer it real multi-threading performance is dubious.
+//!
+//! Notice that this also means that existing pointers will be broken
+//! and you shoould control that allocator is alive along all objects
+//! allocated with him.
+class NCollection_WinHeapAllocator : public NCollection_BaseAllocator
+{
+public:
+
+  //! Main constructor
+  Standard_EXPORT NCollection_WinHeapAllocator (const size_t theInitSizeBytes = 0x80000);
+
+  //! Destructor
+  Standard_EXPORT virtual ~NCollection_WinHeapAllocator();
+
+  //! Allocate memory
+  Standard_EXPORT virtual void* Allocate (const Standard_Size theSize);
+
+  //! Release memory
+  Standard_EXPORT virtual void  Free (void* theAddress);
+
+  // Declaration of CASCADE RTTI
+  DEFINE_STANDARD_RTTI(NCollection_WinHeapAllocator)
+
+private:
+  //! Copy constructor - prohibited
+  NCollection_WinHeapAllocator (const NCollection_WinHeapAllocator& );
+
+private:
+#if(defined(_WIN32) || defined(__WIN32__))
+  void* myHeapH;
+#endif
+  Standard_Boolean myToZeroMemory;
+
+};
+
+// Definition of HANDLE object using Standard_DefineHandle.hxx
+DEFINE_STANDARD_HANDLE (NCollection_WinHeapAllocator, NCollection_BaseAllocator)
+
+#endif //NCollection_WinHeapAllocator_HeaderFile