Recording/Reading C doubles in the IEEE 754 interchange format

Posted by rampion on Stack Overflow See other posts from Stack Overflow or by rampion
Published on 2010-04-23T19:45:50Z Indexed on 2010/04/23 23:23 UTC
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Filed under:

double

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serialization

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interchange

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ieee-754

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c

So I'm serializing a C data structure for cross-platform use, and I want to make sure I'm recording my floating point numbers in a cross-platform manner.

I had been planning on just doing

 char * pos;
 /*...*/
 *((double*) pos) = dataStructureInstance->fieldWithOfTypeDouble;
 pos += sizeof(double);

But I wasn't sure that the bytes would be recorded in the char * array in the IEEE 754 interchange format. I've been bitten by cross-platform issues before (endian-ness and whatnot). Is there anything I need to do to a double to get the bytes in interchange format?

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