reinterpretcast help . from struct to stream and vice-versa

[tonnot]

I have a stream to store and retrieve values from - to an structure

My_structure {
 int A;
 double B;
};
 
put (My_structure &value) {
     const char * buffer ;
     buffer = reinterpret_cast<const char*> (&value);
     the_stream.write(buffer,sizeof value);
}
 
get (My_structure & value) {
    char * buffer ;
    buffer = reinterpret_cast<char*> (&value);
    the_stream.get(buffer, sizeof value);
    value = *reinterpret_cast<My_structure*> (buffer);
 
 
}

My_structure {
 int A;
 double B;
};

put (My_structure &value) {
     const char * buffer ;
     buffer = reinterpret_cast<const char*> (&value);
     the_stream.write(buffer,sizeof value);
}

get (My_structure & value) {
    char * buffer ;
    buffer = reinterpret_cast<char*> (&value);
    the_stream.get(buffer, sizeof value);
    value = *reinterpret_cast<My_structure*> (buffer);


}

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This compile but I get strange values.... (the tellg and tellp are well pointed to zero before starts the get's)
I dont know how to write this last line (value = ) to get the right values...

Any help would be appreciated.