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    <p>I agree with most posts there: C++ is a multi-paradigm language, so the "hidden" features you'll find (other than "undefined behaviours" that you should avoid at all cost) are clever uses of facilities.</p> <p>Most of those facilities are not build-in features of the language, but library-based ones.</p> <p>The most important is the <strong>RAII</strong>, often ignored for years by C++ developers coming from the C world. <strong>Operator overloading</strong> is often a misunderstood feature that enable both array-like behaviour (subscript operator), pointer like operations (smart pointers) and build-in-like operations (multiplying matrices.</p> <p>The use of <strong>exception</strong> is often difficult, but with some work, can produce really robust code through <strong>exception safety</strong> specifications (including code that won't fail, or that will have a commit-like features that is that will succeed, or revert back to its original state).</p> <p>The most famous of "hidden" feature of C++ is <strong>template metaprogramming</strong>, as it enables you to have your program partially (or totally) executed at compile-time instead of runtime. This is difficult, though, and you must have a solid grasp on templates before trying it.</p> <p>Other make uses of the multiple paradigm to produce "ways of programming" outside of C++'s ancestor, that is, C.</p> <p>By using <strong>functors</strong>, you can simulate functions, with the additional type-safety and being stateful. Using the <strong>command</strong> pattern, you can delay code execution. Most other <strong>design patterns</strong> can be easily and efficiently implemented in C++ to produce alternative coding styles not supposed to be inside the list of "official C++ paradigms".</p> <p>By using <strong>templates</strong>, you can produce code that will work on most types, including not the one you thought at first. You can increase type safety,too (like an automated typesafe malloc/realloc/free). C++ object features are really powerful (and thus, dangerous if used carelessly), but even the <strong>dynamic polymorphism</strong> have its static version in C++: the <strong>CRTP</strong>.</p> <p>I have found that most "<em>Effective C++</em>"-type books from Scott Meyers or "<em>Exceptional C++</em>"-type books from Herb Sutter to be both easy to read, and quite treasures of info on known and less known features of C++.</p> <p>Among my preferred is one that should make the hair of any Java programmer rise from horror: In C++, <strong>the most object-oriented way to add a feature to an object is through a non-member non-friend function, instead of a member-function</strong> (i.e. class method), because:</p> <ul> <li><p>In C++, a class' interface is both its member-functions and the non-member functions in the same namespace</p></li> <li><p>non-friend non-member functions have no privileged access to the class internal. As such, using a member function over a non-member non-friend one will weaken the class' encapsulation.</p></li> </ul> <p>This never fails to surprise even experienced developers.</p> <p>(Source: Among others, Herb Sutter's online Guru of the Week #84: <a href="http://www.gotw.ca/gotw/084.htm" rel="nofollow noreferrer">http://www.gotw.ca/gotw/084.htm</a> )</p>
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    1. POHidden Features of C++?
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    1. USpaercebal
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    1. CO+1 very thorough answer. it's incomplete for obvious reasons (otherwise there wouldn't be "hidden features" anymore!) :p in the first point at the end of the answer, you mentioned members of a class interface. do you mean ".. is both its member-functions and the *friend* non-member functions"?
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    2. COCRTP - http://en.wikipedia.org/wiki/Curiously_Recurring_Template_Pattern
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    3. COwhat you are mentioning about with 1 must be koenig lookup, right?
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