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    <p>Hidden features:</p> <ol> <li>Pure virtual functions can have implementation. Common example, pure virtual destructor.</li> <li><p>If a function throws an exception not listed in its exception specifications, but the function has <code>std::bad_exception</code> in its exception specification, the exception is converted into <code>std::bad_exception</code> and thrown automatically. That way you will at least know that a <code>bad_exception</code> was thrown. Read more <a href="http://cpptruths.blogspot.com/2007/05/use-of-stdbadexception.html" rel="nofollow noreferrer">here</a>.</p></li> <li><p>function try blocks</p></li> <li><p>The template keyword in disambiguating typedefs in a class template. If the name of a member template specialization appears after a <code>.</code>, <code>-&gt;</code>, or <code>::</code> operator, and that name has explicitly qualified template parameters, prefix the member template name with the keyword template. Read more <a href="http://en.wikibooks.org/wiki/More_C++_Idioms/Policy_Clone" rel="nofollow noreferrer">here</a>.</p></li> <li><p>function parameter defaults can be changed at runtime. Read more <a href="http://cpptruths.blogspot.com/2005/07/changing-c-function-default-arguments.html" rel="nofollow noreferrer">here</a>.</p></li> <li><p><code>A[i]</code> works as good as <code>i[A]</code></p></li> <li><p>Temporary instances of a class can be modified! A non-const member function can be invoked on a temporary object. For example:</p> <pre><code>struct Bar { void modify() {} } int main (void) { Bar().modify(); /* non-const function invoked on a temporary. */ } </code></pre> <p>Read more <a href="http://cpptruths.blogspot.com/2009/08/modifying-temporaries.html" rel="nofollow noreferrer">here</a>.</p></li> <li><p>If two different types are present before and after the <code>:</code> in the ternary (<code>?:</code>) operator expression, then the resulting type of the expression is the one that is the most general of the two. For example:</p> <pre><code>void foo (int) {} void foo (double) {} struct X { X (double d = 0.0) {} }; void foo (X) {} int main(void) { int i = 1; foo(i ? 0 : 0.0); // calls foo(double) X x; foo(i ? 0.0 : x); // calls foo(X) } </code></pre></li> </ol>
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    1. POHidden Features of C++?
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    1. USJason Plank
    1. USSumant
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      1. VTUpMod
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    1. CO#6 leaves me wondering: WHY?
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    2. COP Daddy: A[i] == *(A+i) == *(i+A) == i[A]
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    3. COI get the commutation, it's just that this means that [] has no semantic value of its own and is simply equivalent to a macro-style replacement where "x[y]" is replaced with "(*((x) + (y)))". Not at all what I expected. I wonder why it's defined this way.
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