Const vs Non const method

[Ola Fosheim Grøstad via Digitalmars-d-learn]

On Monday, 7 March 2016 at 10:52:53 UTC, Ola Fosheim Grøstad 
wrote:
> On Sunday, 6 March 2016 at 17:53:47 UTC, Namespace wrote:
>> What would be the C++ way? Is there any comfortable way to 
>> solve this problem in a nice way like D?
>
> C++ has a non-idiomatic language culture. There are many ways 
> to do it. One clean way could be to use a templated method, 
> another way is to use a function object, a dirty way would be 
> to use a const-cast.

Another thing in C++ is that you can overload members on rvalue 
and lvalue references, from 
http://en.cppreference.com/w/cpp/language/member_functions :

#include <iostream>
struct S {
     void f() & { std::cout << "lvalue\n"; }
     void f() &&{ std::cout << "rvalue\n"; }
};

int main(){
     S s;
     s.f();            // prints "lvalue"
     std::move(s).f(); // prints "rvalue"
     S().f();          // prints "rvalue"
}


Of course, all of this is just because you don't get to specify 
the type of the "this" pointer... So not as clean as it should 
be, but that applies to both languages. Adding lots of syntax 
with no real semantic benefits.