Effective & More Effective C++ by ScotMeyers

By ScotMeyers

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For a class or a class template, the definition lists the members of the class or template: ¤ EC++ Intro, P22 int x; // object definition int numDigits(int number) { int digitsSoFar = 1; // // // // function definition (this function returns the number of digits in its parameter) if (number < 0) { number = -number; ++digitsSoFar; } while (number /= 10) ++digitsSoFar; return digitsSoFar; } class Clock { public: Clock(); ~Clock(); // class definition int hour() const; int minute() const; int second() const; ...

C++ allows multiple locales to be active within a single program, so different parts of an application may employ different conventions. ¤ Item E49, P34 ● ● Support for numeric processing. The end for FORTRAN may finally be near. The C++ library offers a template for complex number classes (the precision of the real and imaginary parts may be float, double, or long double) as well as for special array types specifically designed to facilitate numeric programming. Objects of type valarray, for example, are defined to hold elements that are free from aliasing.

When it doesn't, you'll probably have to fall back on the more advanced (and hence more obscure) "placement new" approach described in Item M4. 27 Effective C++, 2E | Introduction Back on the terminology front, a copy constructor is used to initialize an object with a different object of the same type: ¤ EC++ Intro, P27 class String { public: String(); String(const String& rhs); ... // default constructor // copy constructor private: char *data; }; String s1; String s2(s1); String s3 = s2; // call default constructor // call copy constructor // call copy constructor Probably the most important use of the copy constructor is to define what it means to pass and return objects by value.

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