<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Mar 20, 2018, at 14:08, James Gregurich via cfe-dev <<a href="mailto:cfe-dev@lists.llvm.org" class="">cfe-dev@lists.llvm.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br class="Apple-interchange-newline"><br class=""><blockquote type="cite" class=""><div class="">On Mar 20, 2018, at 3:46 PM, David Chisnall <<a href="mailto:David.Chisnall@cl.cam.ac.uk" class="">David.Chisnall@cl.cam.ac.uk</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><span class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;">On 20 Mar 2018, at 20:06, James Gregurich <</span><a href="mailto:bayoubengalml@mac.com" class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;">bayoubengalml@mac.com</a><span class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;">> wrote:</span><br class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><blockquote type="cite" class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><br class=""><br class=""><br class=""><blockquote type="cite" class="">On Mar 20, 2018, at 1:09 PM, David Chisnall <<a href="mailto:David.Chisnall@cl.cam.ac.uk" class="">David.Chisnall@cl.cam.ac.uk</a>> wrote:<br class=""><blockquote type="cite" class=""><br class="">1) making blocks movable so that they can capture things like unique_ptr<> and still be moved off the stack<span class="Apple-converted-space"> </span><br class=""></blockquote><br class="">This should be relatively simple. Although the interface is a copy, it is effectively a move operation (it either increments a reference count or modifies the source to use forwarding pointers). I don’t see why blocks in C++11 or later shouldn’t always use move constructors for __block-qualified variables where available.<br class=""></blockquote><br class="">What would need to happen to push the concept forward?<br class=""></blockquote><br class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><span class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;">Someone to actually do the work.</span><br class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"></div></blockquote><div class=""><br class=""></div><div class="">I could do it with some hand holding. I have no experience with compiler development or the clang codebase, but pointed in the right direction, I could figure it out.</div></div></div></blockquote><div><br class=""></div><div>Thanks for getting involved – if you add me to any reviews, I can help you find appropriate reviewers at Apple.</div><br class=""><blockquote type="cite" class=""><div class=""><div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><blockquote type="cite" class=""><div class=""><span class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;">Objective-C methods don’t support overloading (with Apple runtimes, at least), so you’d need to generate only one.</span><br class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"></div></blockquote><div class=""><br class=""></div><div class="">which is the answer I expected. One could still manually implement the other if needed.</div><div class=""><br class=""></div><blockquote type="cite" class=""><div class=""><br class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><span class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;">Why do you use std:: pointers for this? Before ARC existed, I created a C++ smart pointer class that just called retain / release. When ARC was introduced, I extended it to use the same functions that ARC uses, so you can use ARC-like smart pointers in a non-ARC codebase. Is there a reason why you need these to be std::shared / weak pointers, which imply some different semantics?</span><br class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"></div></blockquote><div class=""><br class=""></div><div class="">why roll my own when I can use the standard ones? they work perfectly fine with custom deallocators to call [release] in the non-arc case.</div><div class=""><br class=""></div><div class="">you can't do threading-friendly weak pointers without ARC using only retain/release. Why write some new mechanism when the standard one works fine and makes for wonderfully maintainable code? The only issue remaining is making weak_ptr<> a little smarter to handle ARC correctly.</div></div></div></blockquote><div><br class=""></div><div>I agree it would be great to get ARC-managed pointers working well in std::shared_ptr and std::weak_ptr. The usual subtlety with templates is that __strong doesn't show up in C++ mangling, so it's not straightforward to avoid ODR violations when ARC and MRR translation units are linked together. I think this is solvable, but I doubt it's trivial.</div><br class=""><blockquote type="cite" class=""><div class=""><div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><blockquote type="cite" class=""><div class=""><blockquote type="cite" class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><a href="https://gist.github.com/bayoubengal/e4877efd84b32fb48b4fb00fb1e4a5c9" class="">https://gist.github.com/bayoubengal/e4877efd84b32fb48b4fb00fb1e4a5c9</a><br class=""></blockquote><br class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><span class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;">There isn’t enough information in that gist for me to understand what the desired behaviour is.</span><br class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"></div></blockquote><div class=""><br class=""></div><div class=""><br class=""></div><div class="">the idea is to change the compiler to handle the following syntax:</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">auto tmpCalcuStringLmbda = @lambda( -[cMyClass calculateStringValue:withNumber:] );</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">the compiler would automatically generate the following code:</div><div class=""><br class=""></div><div class=""><br class=""> auto tmpCalcuStringLmbda = [](cMyClass* theObjPtr, NSString* theValue1Ptr, size_t theValue)<br class=""> {<br class=""> return [theObjPtr calculateStringValue: theValue1Ptr withNumber: theValue];<br class=""> };</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">in essence, the compiler would create a lambda whose signature matches the signature of the selector declaration. calling the lambda calls the selector passing in the arguments.</div><div class=""><br class=""></div><div class="">once you have a lambda declared, that could be passed to template machinery in the usual way.</div></div></div></blockquote><div><br class=""></div><div>I'm skeptical of inventing an ObjC++-specific terse lambda syntax. I'm tempted to let C++ evolve/improve lambda syntax first.</div><br class=""><blockquote type="cite" class=""><div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><blockquote type="cite" class=""><span class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;">A SEL typed parameter.</span><br class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><br class=""></blockquote><br class=""></div><div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">that isn't a convenient mechanism as the template machinery has no way to deduce the signature of the method. you end up have to manually cast the IMP. having the compiler handle the type checking on the invocation would be much preferable.</div><div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; 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