Date: Fri, 26 Jan 2018 06:22:36 -0800 From: Mark Millard <marklmi26-fbsd@yahoo.com> To: svn-src-head@freebsd.org Subject: Re: svn commit: r328430 - head/sbin/devd Message-ID: <7F6D11A1-70B6-4A7E-9D5D-93E2C9F8E368@yahoo.com>
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Warner Losh imp at bsdimp.com wrote on Fri Jan 26 06:02:04 UTC 2018 : > It's a flaw in C++ that you have a choice here. All dtors should be > virtual because you never know when you'll have new derived classes and > have to hunt down a hard-to-find bug because you didn't go back and make it > virtual. The "C++ Coding Standards" book described it this way: QUOTE To delete, or not to delete, that is the question: if deleting through a pointer to base Base should be allowed, then Base's destructor must be public and virtual. Otherwise, it should be protected and nonvirtual. . . . Corollary: Always write a destructor for a base class, because the implicitly generated one is public and nonvirtual. END QUOTE See page 90 for more. === Mark Millard marklmi at yahoo.com ( markmi at dsl-only.net is going away in 2018-Feb, late)
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