<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><span style="font-family: Menlo; font-size: 11px;" class="">Hi everyone!</span><br class=""><div><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="margin: 0px; line-height: normal;" class=""><font face="Menlo" class=""><span style="font-size: 11px;" class=""><br class=""></span></font></div><div style="margin: 0px; line-height: normal;" class=""><font face="Menlo" class=""><span style="font-size: 11px;" class="">I have a generic class similar to this one:</span></font></div><div style="margin: 0px; line-height: normal;" class=""><font face="Menlo" class=""><span style="font-size: 11px;" class=""><br class=""></span></font></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">class</span> C<T: Equatable> {</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""> <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">let</span> t: <span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">T</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""> <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">init</span>(t: <span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">T</span>) { <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">self</span>.<span style="font-variant-ligatures: no-common-ligatures; color: #4f8187" class="">t</span> = t }</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class="">}</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><br class=""></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class="">When try to wrap ‘Int?' inside, I get the following error:</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; min-height: 13px;" class=""><br class=""></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">let</span> a = C<<span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">Int</span>?>(t: <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">nil</span>) <span style="color: rgb(0, 132, 0);" class="">// ERROR: Type "Int?" does not conform to protocol 'Equatable'</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; min-height: 13px;" class=""><br class=""></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; min-height: 13px;" class="">Yet when I try to compare two ‘Int?’ values, everything works:</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; min-height: 13px;" class=""><br class=""></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">let</span> a: <span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">Int</span>? = <span style="font-variant-ligatures: no-common-ligatures; color: #272ad8" class="">5</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">let</span> b: <span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">Int</span>? = <span style="font-variant-ligatures: no-common-ligatures; color: #272ad8" class="">6</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; min-height: 13px;" class=""><br class=""></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><span style="color: rgb(0, 132, 0);" class=""><span style="color: rgb(187, 44, 162);" class="">let</span> </span>c = <span class="">a</span> == <span class="">b</span><span style="color: rgb(79, 129, 135);" class=""> </span><font color="#008400" class="">// NO ERROR</font></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 132, 0);" class=""><br class=""></div><div style="margin: 0px; line-height: normal;" class=""><div style="margin: 0px; line-height: normal; min-height: 13px;" class=""><font face="Menlo" class=""><span style="font-size: 11px;" class="">So, is ‘Int?' equatable or not?</span></font></div><div style="margin: 0px; line-height: normal; min-height: 13px;" class=""><font face="Menlo" class=""><span style="font-size: 11px;" class=""><br class=""></span></font></div><div style="margin: 0px; line-height: normal; min-height: 13px;" class=""><font face="Menlo" class=""><span style="font-size: 11px;" class="">Thanks!</span></font></div><div style="margin: 0px; line-height: normal; min-height: 13px;" class=""><font face="Menlo" class=""><span style="font-size: 11px;" class=""><br class=""></span></font></div><div style="margin: 0px; line-height: normal; min-height: 13px;" class=""><font face="Menlo" class=""><span style="font-size: 11px;" class="">R+</span></font></div></div></div></div><br class=""></body></html>