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			#ifndef SHAREMEMORY_HPP
#define SHAREMEMORY_HPP

#include<string>
#include"Uncopyable.hpp"

// it will arise an error in ~ShareMemory if the class can be copied
//because it will munmap one memory more than one time
class ShareMemory : public Uncopyable
{

public:
    ShareMemory(const std::string& fileName, int memSize = 4096);
    ~ShareMemory();

    //wheather create a shareMemory success or not
    operator bool () {
 return mp_ptr != NULL; 
}

    void readShm(int shmOffset, void* buf,  int size);
    void writeShm(int shmOffset, const void* buf, int size);

private:
    char* mp_ptr; //point to the share memory
    int m_share_mem_size;

};

#endif // SHAREMEMORY_HPP