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    <p>As far as I know, you have two choices for floating point exception handling in C and C++:</p> <p>First, if you disable/mask floating point exceptions (which most environments do by default), you can see whether any floating point exceptions have occurred by calling <a href="http://linux.die.net/man/3/fetestexcept" rel="nofollow noreferrer">fetestexcept</a>. fetestexcept isn't available in Visual C++, but you can steal the MinGW Runtime's implementation easily enough. (It's in the public domain.) Once an exception has been flagged, it's not cleared until you call feclearexcept, so you can call fetestexcept at the end of a series of calculations to see if any of them raised an exception. This doesn't give you the traps that you asked for, but it does let you test if problems like NaN or +/-inf have occurred and react as needed.</p> <p>Second, you can enable/unmask floating point exceptions by calling <a href="http://linux.die.net/man/3/feenableexcept" rel="nofollow noreferrer">feenableexcept</a> in Linux or <a href="http://msdn.microsoft.com/en-us/library/e9b52ceh(VS.80).aspx" rel="nofollow noreferrer">_controlfp</a> in Windows. How the operating system handles a processor-generated floating point exception depends on your operating system.</p> <ul> <li>In Linux, the OS sends a SIGFPE signal, so you can install a signal handler to catch that and set a flag that tells your routine to react appropriately.</li> <li>In Windows, the OS invokes Structured Exception Handling to convert the processor exception into a language exception that you can catch using a <code>__try</code> / <code>__catch</code> block in C or <code>try</code> / <code>catch</code> block in C++.</li> <li><strong>Update:</strong> For Mac OS X, as described in <a href="https://stackoverflow.com/questions/247053/enabling-floating-point-interrupts-on-mac-os-x-intel/340683#340683">this answer</a>, you should be able to enable/unmask exceptions using <code>_MM_SET_EXCEPTION_MASK</code> from <code>xmmintrin.h</code>, and as long as you use the default compiler options (i.e., don't disable SSE), you should be able to catch exceptions using SIGFPE. </li> </ul> <p>(I've written a bit more on this and other floating point issues in C and C++ in <a href="http://codingcastles.blogspot.com/2009/01/floating-point-reference.html" rel="nofollow noreferrer">this blog posting</a> if you're curious.)</p>
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    1. POwhat languages expose IEEE 754 traps to the developer?
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    1. USJosh Kelley
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    1. COThat's a good point, I was just playing with this, and since I feel lucky, I'm on a mac with 2 platform specifics problems : http://www.gnu.org/software/hello/manual/gnulib/feenableexcept.html http://lists.apple.com/archives/Darwin-dev/2006/Mar/msg00102.html
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    2. COThe info in the link I added seems to work for me in my limited testing.
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    3. COThanks for the mac OS X link, this makes a very irregular handling, since it works only for sse types (float and double) but not for long double, which is x87 specific. Moreover, enabling exceptions does it for the whole process, not for the current thread, which makes working with it difficult.
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