c++ - Move semantics between base classes -

c++ - Move semantics between base classes -

we have these classes:

struct intermediate : public std::array<double,3> {}; struct vector3 : public intermediate { // ........more ctors......... // modified move constructor (base class) vector3(std::array<double,3> &&v) { ??????? } // ........more functionality........... };

is "modified" move constructor deed original move constructor?

how can implement constructor? there way std::array::swap?

you this:

vector3(std::array<double,3> &&v) { static_cast<std::array<double,3>&>(*this) = std::move(v); }

this move-assigns v base of operations class of this

but move constructor seems pretty pointless. when move array of double re-create anyway. double has no move semantics, re-create semantics, , array<double,n> contains array straight within it, cannot move object.

c++ c++11 move-semantics