> On Dec 2, 2015, at 23:03, Jens Alfke <j...@mooseyard.com> wrote: > > >> On Dec 2, 2015, at 10:41 PM, Clark Cox <clarkc...@gmail.com> wrote: >> >>> Widget *w = factory.getCurrentWidget(); >>> Paint *p = w->getPaint(); >>> If the currentWidget is NULL, the second line does this. >> >> That counts as a pointer dereference (the special case of &*foo is just >> that, a special case). > > It syntactically looks like one, but it isn’t one. “Dereference” means > referencing, i.e. accessing, the memory location pointed to. A nonvirtual > method call doesn’t do that. >
The C++ standard disagrees with you. > 6.5.3.2 Address and indirection operators > … (Special case for &* that you mentioned before): > 3 The unary & operator yields the address of its operand. If the operand > has type ‘‘type’’, the result has type ‘‘pointer to type’’. If the operand is > the result of a unary * operator, neither that operator nor the & operator is > evaluated and the result is as if both were omitted, … > … Meat of the matter: > 4 The unary * operator denotes indirection. If the operand points to a > function, the result is a function designator; if it points to an object, the > result is an lvalue designating the object. If the operand has type ‘‘pointer > to type’’, the result has type ‘‘type’’. If an invalid value has been > assigned to the pointer, the behavior of the unary * operator is > undefined.102) _______________________________________________ Do not post admin requests to the list. They will be ignored. Xcode-users mailing list (Xcode-users@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/xcode-users/archive%40mail-archive.com This email sent to arch...@mail-archive.com
