C Memory layout question

[tntcoder]

Hi,

With variables like an 8 byte double or 4 byte int, is the memory layout exactly the same across Windows, Linux and OSX assuming the endianness is the same?

Say for example, I copy 8 bytes from a double on Linux into a double on Windows, will it work or explode?

Thanks,

Jack

 

[tntcoder]

Ok thanks a lot sounds like it should be fine, assuming the OS sticks to the IEEE standards.

 

[tntcoder]

and how do you plan to do that? (not taking the mick here, but if you can explain how you would do that, i think you might answer your questions)

Ok thanks guys, let me give an example of what im doing, I need to save data in double variables (8 bytes) to disk (I know this isnt the best way but its ideal for what im doing), and i need it to work for windows, mac and linux. Is a double 8 bytes on all these OSs, and is the memory encoding IEEE standard?

example of how im doing this: (working fine on linux, havent tested on windows/mac)

double a = 4;
unsigned char *p = (unsigned char *) &a;

for(int i = 0; i < sizeof(double); i++)
{
      bytes.append(p[i]);
}

Thanks,
Jack