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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin: 10px 0 0 0; margin-top: 0">Looking at ddf.h and ddf.cpp I see what its doing. Kinda.</p> <p style="margin: 10px 0 0 0">I guess this makes me wonder what the problem, or rather what the solution, is.</p> <p style="margin: 10px 0 0 0">As things curently stand a "long" (regardless of width) will end up on the wire as <tt><number <span class="error">[name="foo"]</span>>12345</number></tt> (as opposed to <tt><number>123.456</number></tt>. So the (only) issue we care about is when the sending end is 64 bits and the 12345 bit is more than will fit into a long on the 32 bit side.</p> <p style="margin: 10px 0 0 0">AFAICS we can look in several places. Working backwards</p>
<ol>
<li>Dynamically on the "32 bit long" side: we can (somehow) sense that the string is too big to fit into our 32 bit long and throw an exception.</li>
<li>Dynamically on the "64 bit long" side: we can (again somehow) sense that the string will be too big to fit into our 32 bit long and warn. I suppose we could throw an exception, but then 64 to 64 bit communication would be prejudiced (but do we care, see below)</li>
<li>Statically: We could teach DDF about ddf_int_t (s/long/ddf_int_t/) and define that as being 32 bit always. Then we need to go through all the code which builds a DDF explicitly testing for the 33rd bit and doing something appropriate (I'd probably change the method names from <tt>integer</tt> to <tt>int32</tt> to make it obvious.</li>
</ol> <p style="margin: 10px 0 0 0">In all cases the next question is "and what does the deployer do about it?"</p> <p style="margin: 10px 0 0 0">I may be missing a cute C++ tick here. But for now, without more insight into the code flows I'm unwilling to decide which is the way to go.</p> <p style="margin: 10px 0 0 0">I suspect that Scott will say that the last is what is needed but its certainly the biggest (either that or the aforesaid C++ trick I missed).</p> <p style="margin: 10px 0 0 0">The second is the easiest (<tt>if (i >> 32) throw IOException("Overflow");</tt>)</p> </td>
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