Imperfect C++ practical solutions for real-life programming by Matthew Wilson

By Matthew Wilson

C++, even supposing a wonderful language, isn't really excellent. Matthew Wilson has been operating with it for over a decade, and through that point he has came across inherent boundaries that require skillful workarounds. during this ebook, he does not simply inform you what is wrong with C++, yet bargains functional recommendations and instruments for writing code that is extra strong, versatile, effective, and maintainable. He indicates you the way to tame C++'s complexity, reduce via its sizeable array of paradigms, take again keep an eye on over your code - and get much better results.If you are a long-time C++ developer, this ebook may also help you notice your programming demanding situations in new methods - and remove darkness from robust strategies you could by no means have attempted. if you are more recent to C++, you are going to study ideas that might make you better in your entire initiatives.

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7 we see this constraint used in conjunction with a more specialized one: must_be_pod_or_void(), in order to be able to check that the base types of pointers are not nontrivial class types. This relies on specialization [Vand2003] of the must_be_pod_or_void template, whose general definition is identical to must_be_pod: template struct must_be_pod_or_void { . . // Same as must_be_pod }; template <> struct must_be_pod_or_void { // Contains nothing, so doesn't trouble the compiler }; Once again, the messages produced by the compilers when the must_be_pod / must_be_pod_or_void constraints are fired vary considerably: class NonPOD { public: virtual ~NonPOD(); }; must_be_pod a; // int is POD (see Prologue) must_be_pod b; // not_subs is POD (see Prologue) must_be_pod c; // NonPOD isn't: compile error In this case, Digital Mars's customary terseness lets us down, since all we get is "Error: union members cannot have ctors or dtors" reported for the offending line in the constraint.

Wouldn't you want it to experience a crash if you'd failed to code it correctly, thereby being representative of the release mode behavior? Even if you've got a super smart assert [Robb2003], it still sets a bad example for yourself and anyone reviewing your team to see such things. In my opinion, applying assertions to runtime failure conditions, even if accompanied by subsequent release-time handling code, is at best a distraction, and at worst bad practice. Don't do it! Recommendation: Use assertions to assert truths about the structure of the code, not about runtime behavior.

1. template< typename D , typename B > struct must_have_base { ~must_have_base() { void(*p)(D*, B*) = constraints; } private: static void constraints(D* pd, B* pb) { pb = pd; } }; It works by requiring that a pointer to the template parameter D can be assigned to a pointer to the template parameter B. It does this in a separate static function, constraints(), in order that it will never be called, so there's no generated code and no runtime cost. The destructor declares a pointer to this function, thereby requiring the compiler at least to evaluate whether the function, and the assignment within it, is valid.

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