Mmap.h

#pragma once
#include <sys/mman.h>
class Mmap
{
public:
        Mmap();
        ~Mmap();

        void* map(off_t offset, size_t size);

        void unmap();

        template<typename T>
        static int read(off_t offset, T& value)
        {
                Mmap mmap;
                T* ptr = (T*)mmap.map(offset, sizeof(T));
                if(ptr) {
                        value = ptr[0];
                        return 0;
                } else
                        return -1;
 
        }

        template<typename T>
        static int write(off_t offset, const T& value)
        {
                Mmap mmap;
                T* ptr = (T*)mmap.map(offset, sizeof(T));
                if(ptr) {
                        ptr[0] = value;
                        return 0;
                } else
                        return -1;
        }
private:
        int fd;
        void* ptr;
        size_t size;
};