You can either use a constructor or a builder pattern or a variation of the builder pattern to fix the problem of having too many fields in your initialization step. I’m going to extend your example a bit to prove my point of why these options are useful. Understanding your example: Lets say an Offer … Read more
In general, if something is documented as being a constructor, use new with it. But in this case, RegExp has a defined “factory” behavior for the situation where you’ve called it as a function instead. See Section 15.10.3 of the ECMAScript (JavaScript) specification (that links to the outgoing spec; the section number is the same … Read more
You can specify how to initialize members in the member initializer list: BigMommaClass { BigMommaClass(int, int); private: ThingOne thingOne; ThingTwo thingTwo; }; BigMommaClass::BigMommaClass(int numba1, int numba2) : thingOne(numba1 + numba2), thingTwo(numba1, numba2) {}
For POD data members, it makes no difference, it’s just a matter of style. For class members which are classes, then it avoids an unnecessary call to a default constructor. Consider: class A { public: A() { x = 0; } A(int x_) { x = x_; } int x; }; class B { public: … Read more
From 8 Declarators [dcl.decl] 3: Each init-declarator in a declaration is analyzed separately as if it was in a declaration by itself. It goes on to say A declaration with several declarators is usually equivalent to the corresponding sequence of declarations each with a single declarator. That is T D1, D2, … Dn; is usually … Read more
You can specify how to initialize members in the member initializer list: BigMommaClass { BigMommaClass(int, int); private: ThingOne thingOne; ThingTwo thingTwo; }; BigMommaClass::BigMommaClass(int numba1, int numba2) : thingOne(numba1 + numba2), thingTwo(numba1, numba2) {}
For POD class members, it makes no difference, it’s just a matter of style. For class members which are classes, then it avoids an unnecessary call to a default constructor. Consider: class A { public: A() { x = 0; } A(int x_) { x = x_; } int x; }; class B { public: … Read more