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<!--StartFragment--><p class="MsoNormal"><b style="mso-bidi-font-weight:normal"><i style="mso-bidi-font-style:
normal">ISSUE 7: We intend to add an example showing how generic selection can
be used to define cbrt for tgmath to handle decimal as well as generic FP
types.<o:p></o:p></i></b></p><p class="MsoNormal">in Part 2, I'm wondering if providing the example is really desirable. </p><div>An implementation that supports Parts 1 and 2 might implement the cbrt type-generic macro as:</div><p class="MsoNormal"><div>#ifdef __STDC_WANT_IEC_00000_EXT2</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>#define cbrt(X) _Generic((X), \<br> _Decimal128: cbrtd128(X), \<br> _Decimal64: cbrtd64(X), \<br> _Decimal32: cbrtd32(X), \<br> long double: cbrtl(X), \<br> default: _Roundwise_cbrt(X), \<br> float: cbrtf(X) \<br> )</div><div>#else</div><div><div><span class="Apple-tab-span" style="white-space: pre; "> </span>#define cbrt(X) _Generic((X), \<br> long double: cbrtl(X), \<br> default: _Roundwise_cbrt(X), \<br> float: cbrtf(X) \<br> )</div></div><div>#endif<br> <br>where _Roundwise_cbrt() is equivalent to cbrt() invoked without macro-replacement suppression.</div><div><br></div><div>However, implementing a 2 or 3 argument function using _Generic, which is already prohibitively cumbersome with just C11, would become even worse with decimal types. It's difficult to imagine an implementation would do it, even without decimal types.</div><div><br></div><div>If the example is just for programmers writing type-generic macros for their own 1-argument functions, then this straightforward example isn't really needed.</div><div><br></div><div>Your thoughts?</div><div><br></div><div>-Jim</div><div><br></div><div><br></div><div></div></p>
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