iox::rp::RelativePointer violates type safety

[elfenpiff]

Required information

It is possible to assign any arbitrary pointer to the RelativePointer, see the following code:

float f;
iox::rp::RelativePointer<int> ptr{&f}; // is accepted but should result in a compile time error
int* fuu = ptr; // this causes now problems since we have a pointer to the wrong type

// as comparision
int * fuu = &f; // this leads to a compile time error.

The AtomicRelocatablePointer is not affected and works as expected.

[elfenpiff]

FYI @MatthiasKillat . I think this may be fixed quickly - do you have time to fix this before 2.0 ?

[MatthiasKillat]

@elfenpiff I think I have the time. But at some point I wanted to also refactor the whole design, e.g. without inheritance which was a questionable decision and an optimized lookup/repository (lookup needs to be fast, as it happens anytime we dereference). The refactoring would clean up some code similar to the refactoring of relocatable_ptr (which already happened).

Before 2.0: bugfix yes, refactoring no. Will have a look tomorrow.