/*

Resource Manager template

Inherited from for each resource type

Caches the resource in question and frees it when the manager
is deleted (generally on program shutdown)

*/

#include <map
#include <string

#include <assert.h

using namespace std;

template <class R class resourcemanager {
protected:
 map <string, R * resources;

public:
 R &GetResource (const string &filename)
 {
  if (resources.find(filename) == resources.end()) //need to load resource
  {
   R* a = Load (filename);
   assert(a != NULL); //alternatively, handle it here
   resources[filename] = a;
  }
  return *(resources[filename]);
 }

 virtual ~resourcemanager()
 {
        //iterate along map
  for (map<string, R*::iterator i = resources.begin(); i != resources.end(); i++)
   delete i-second;

  resources.clear();
 }

protected:
 virtual R *Load(const string &filename)=0;
};