Passing temporaries as non-const references in C++

Question

I have the following piece of code, as an example dec_proxy attempts to reverse the effects of the increment operator upon the type that is executed in a complex function call f

Answer 1

Taking Stephen's advice, you should look at the answer to How come a non-const reference cannot bind to a temporary object? and simply add a member function that returns a reference dec_proxy, e.g.:

dec_proxy &ref() { return *this; }

and call foo:

foo(
    dec_proxy(i).ref(), 
    dec_proxy(j).ref(), 
    dec_proxy(k).ref());

I'm pretty sure that compiles.