How to use variable and move variable at the same time?

Question

Let's assume we have the following code:

struct some_class : parent
{

    some_class(::other_class oth) :
       parent(some_function(oth.some_property), std::move(oth))
    {}

};

Of course construction results in undefinied behaviour (crash in my case), since c++ does not specify execution order. But then, how can I retreive the property before the movement? I cannot change the parent.

Answer 1

You could try a delegating constructor:

struct some_class : parent
{

    some_class(::other_class oth) :
       some_class(some_function(oth.some_property), std::move(oth))
    {}

private:
    some_class(const ::Foo& foo, ::other_class&& oth) :
       parent(foo, std::move(oth))
    {}
};