C++ Assume you have a class Foo, and this: const Foo fooInst(1, 2, 3); if you try to call a method foo.bar() you can't, unless that method bar() is also mark

C++ Assume you have a class Foo, and this: const Foo fooInst(1, 2, 3); if you try to call a method foo.bar() you can't, unless that method bar() is also marked const with this type of signature: int bar() const; Meaning that bar returns an int, but can't assign to any fields or call any other non-const methods. Although, it does have this hideous const_cast<> operator that anyone can use to break these rules.