Overriding essentially means that either the Base class method or the Derived class method will be called at run-time depending on the actual object pointed by the pointer. It implies that: i.e: Every place where the Base class method can be called can be replaced by call to Derived class method without any change to … Read more
You can undefine it and define again: #include <iostream> #define AAA 13 int main() { #undef AAA #define AAA 7 std::cout << AAA; } outputs: 7 Please note that statements that start with # are preprocessor directives that are taken care of before the code is even compiled. In this case, this constant AAA will … Read more
You’re defining the class in the header file, include the header file into a *.cpp file and define the class a second time because the first definition is dragged into the translation unit by the header file. But only one gameObject class definition is allowed per translation unit. You actually don’t need to define the … Read more
The following module may do what you want. If not it may provide some pointers to your solution module RemovableConstants def def_if_not_defined(const, value) self.class.const_set(const, value) unless self.class.const_defined?(const) end def redef_without_warning(const, value) self.class.send(:remove_const, const) if self.class.const_defined?(const) self.class.const_set(const, value) end end And as an example of using it class A include RemovableConstants def initialize def_if_not_defined(“Foo”, “ABC”) def_if_not_defined(“Bar”, … Read more
This problem is caused when including <windows.h> before <winsock2.h>. Try arrange your include list that <windows.h> is included after <winsock2.h> or define _WINSOCKAPI_ first: #define _WINSOCKAPI_ // stops windows.h including winsock.h #include <windows.h> // … #include “MyClass.h” // Which includes <winsock2.h> See also this.