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THe inheritance must be public to be able to call interface() and static_fun() from Derived. |
corrected which function is instantiated |
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In the above example, the function <code>Base<Derived>::interface()</code>, though ''declared'' before the existence of the <code>struct Derived</code> is known by the compiler (i.e., before <code>Derived</code> is declared), is not actually ''instantiated'' by the compiler until it is actually ''called'' by some later code which occurs ''after'' the declaration of <code>Derived</code> (not shown in the above example), so that at the time the function "
This technique achieves a similar effect to the use of [[virtual function]]s, without the costs (and some flexibility) of [[dynamic polymorphism]]. This particular use of the CRTP has been called "simulated dynamic binding" by some.<ref>{{cite web | url=http://www.pnotepad.org/devlog/archives/000083.html | title=Simulated Dynamic Binding | date=7 May 2003 | accessdate=13 January 2012 | url-status=dead | archiveurl=https://web.archive.org/web/20120209045146/http://www.pnotepad.org/devlog/archives/000083.html | archivedate=9 February 2012 }}</ref> This pattern is used extensively in the Windows [[Active Template Library|ATL]] and [[Windows Template Library|WTL]] libraries.
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