allocator.h
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00001 #ifndef MEGATREE_ALLOCATOR_H
00002 #define MEGATREE_ALLOCATOR_H
00003 
00004 #include <vector>
00005 #include <boost/shared_ptr.hpp>
00006 #include <boost/thread/mutex.hpp>
00007 #include <cstdio>
00008 
00009 namespace megatree
00010 {
00011 
00012 
00013 template <class T>
00014 class Allocator
00015 {
00016 public:
00017   Allocator(unsigned size=0)
00018     : objects(NULL), overflow(0)
00019   {
00020     objects = new T[size];
00021     obj_stack.reserve(size);
00022     assert(objects);
00023     for (unsigned i=0; i<size; i++)
00024       obj_stack.push_back(&objects[i]);
00025 
00026     printf("Allocator for %d objects takes %d bytes\n", (int)size, (int)(size*sizeof(T)));
00027   }
00028 
00029   ~Allocator()
00030   {
00031     boost::mutex::scoped_lock lock(mutex);
00032     delete [] objects;
00033   }
00034 
00035   T* allocate()
00036   {
00037     boost::mutex::scoped_lock lock(mutex);
00038     assert(!obj_stack.empty());
00039     T* obj = obj_stack.back();
00040     obj_stack.pop_back();
00041     return obj;
00042   }
00043 
00044   void allocateMany(size_t howmany, std::vector<T*> &vec)
00045   {
00046     boost::mutex::scoped_lock lock(mutex);
00047     assert(obj_stack.size() >= howmany);
00048 
00049     typename std::vector<T*>::iterator begin = obj_stack.end() - howmany;
00050 
00051     // Moves begin..obj_stack.end() from obj_stack to vec
00052     vec.clear();
00053     vec.reserve(howmany);
00054     vec.insert(vec.begin(), begin, obj_stack.end());
00055     obj_stack.erase(begin, obj_stack.end());
00056   }
00057 
00058 
00059   void deAllocate(T* obj)
00060   {
00061     boost::mutex::scoped_lock lock(mutex);
00062     obj_stack.push_back(obj);
00063   }
00064 
00065   void deallocateMany(std::vector<T*> &vec)
00066   {
00067     boost::mutex::scoped_lock lock(mutex);
00068     obj_stack.insert(obj_stack.end(), vec.begin(), vec.end());
00069     vec.clear();
00070   }
00071 
00072 
00073 private:
00074   boost::mutex mutex;
00075   T* objects;
00076   std::vector<T*> obj_stack;
00077   unsigned overflow;
00078 
00079 };
00080 
00081 }
00082 
00083 #endif


megatree_core
Author(s): Stuart Glaser
autogenerated on Thu Nov 28 2013 11:30:23