这样写主要是比较方便，可以省一些代码。
功能还比较少。

代码，附带一个test：
http://files.cnblogs.com/nicky/simple_res_mgr.rar

#ifndef _RESOURCEMGR_H__
#define _RESOURCEMGR_H__

#include <map>
#include <boost/shared_ptr.hpp>
//#include "simple_string.h"
#include <string>
#include <sstream>
typedef std::string String;

namespace Nicky
{
 template<typename ResPtr> //expecting boost shared_ptr type
 class ResourceMgr
 {
 public:
  typedef typename ResPtr::element_type res_type;
  typedef ResPtr       res_ptr_type;
  typedef std::map<String,ResPtr>   res_cont_type;

public:
  ResourceMgr(void) {}
  virtual ~ResourceMgr(void) {}

//derived class should implement its own create interface

virtual void Delete(const String& name)
  {
   res_cont_type::iterator i = m_Resources.find(name);
   if (i != m_Resources.end())
    m_Resources.erase(i);
  }

virtual void Delete(const res_ptr_type& p)
  {
   res_cont_type::iterator i, iend = m_Resources.end();
   for(i = m_Resources.begin(); i != iend; ++i)
   {
    if( i->second == p )
    {
     m_Resources.erase(i);
     return;
    }
   }
  }

virtual void DeleteAll()
  {
   m_Resources.clear();
  }

//search
  res_ptr_type getByName(const String& name) const
  {
   res_cont_type::const_iterator i = m_Resources.find(name);
   if (i != m_Resources.end())
    return i->second;

return res_ptr_type();
  }

template<typename T>
  boost::shared_ptr<T> getByName(const String& name, boost::shared_ptr<T>& p) const
  {
   res_cont_type::const_iterator i = m_Resources.find(name);
   if (i != m_Resources.end())
    return (p = boost::static_pointer_cast<T>(i->second));

return boost::shared_ptr<T>();
  }

bool isExist(const String& name) const
  {
   res_cont_type::const_iterator i = m_Resources.find(name);
   if (i != m_Resources.end())
    return true;

return false;
  }

protected:

String generateName() const
  {
   static int num_gen_names = 0;
   String name;
   std::stringstream ss;
   ss<<"gen_"<<num_gen_names++;
   name = ss.str();

return name;
  }

//no care about name
  res_ptr_type insert(const res_ptr_type& p)
  {
   return m_Resources.insert(
    res_cont_type::value_type(this->generateName(), p)
    ).first->second;
  }

template<typename T>
  boost::shared_ptr<T> insert(const boost::shared_ptr<T>& p)
  {
   m_Resources.insert(
    res_cont_type::value_type(this->generateName(), p)
    );

return p;
  }

//no care about name (name not yet existed)
  res_ptr_type insert(const String& name, const res_ptr_type& p)
  {
   return m_Resources.insert(
    res_cont_type::value_type(name, p)
    ).first->second;
  }

template<typename T>
  boost::shared_ptr<T> insert(const String& name, const boost::shared_ptr<T>& p)
  {
   m_Resources.insert(
    res_cont_type::value_type(name, p)
    );

return p;
  }

protected:
  //resource holder  
  res_cont_type m_Resources;
 };

}

#endif //_RESOURCEMGR_H__