From -628006875195074669 X-Google-Thread: f78e5,6dda3f736a89f6d8 X-Google-NewGroupId: yes X-Google-Attributes: gid7894ca11fe,domainid0,public,usenet X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news1.google.com!news1.google.com!news.glorb.com!news.alt.net!frodo.cs.rpi.edu!not-for-mail From: lucdanton Newsgroups: comp.std.c++ Subject: Re: shared_from_this() from constructor Date: Thu, 26 Aug 2010 13:10:22 CST Organization: http://groups.google.com Lines: 48 Sender: cppmods@cs.rpi.edu Approved: james.dennett@gmail.com Message-ID: References: NNTP-Posting-Host: netlab.cs.rpi.edu Content-Type: text/plain; charset=ISO-8859-1 To: (Usenet) Return-Path: X-Original-Date: Thu, 26 Aug 2010 03:46:17 -0700 (PDT) X-Submission-Address: std-c++@netlab.cs.rpi.edu Xref: g2news1.google.com comp.std.c++:2911 On Aug 26, 12:49 am, Florian Goujeon wrote: > The current GCC's implementation doesn't allow to call > shared_from_this() from the class' constructor, just like the original > Boost's implementation. > Is this a standard-compliant behavior? The current draft doesn't talk > about this. > I hope it's not. This is really annoying... If what you're trying to do (but really, I can't tell if you don't) is to register new objects somewhere, then the usual solution is to separate concerns: - have constructors private or protected: their concern is to setup new instances with correct invariants (nothing unusual here) - expose a (or several) public factory function that return shared_ptr to new instances: their concern is to register new instances Could be as simple as: class Something; /* could be part of the class, too */ void add_to_registry(std::shared_ptr const&); /* enabled_shared_from_this might or might not be necessary */ class Something: public std::enable_shared_from_this { /* whatever */ template static std::shared make(T&& ...t) { auto p = std::make_shared(std::forward(t)...); add_to_registry(p); return p; } }; Or maybe Something::make can return a reference to *p and the registry takes care of lifetime management, if that's what you want. -- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@netlab.cs.rpi.edu] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://www.comeaucomputing.com/csc/faq.html ]