A user asked the following question
Can you explain why key object is copyable and movable ?
A user asked the following question
Can you explain why key object is copyable and movable ?
The author replied this:
Hello,
Let me answer the question more general. The containers of the STL have copy-semantic. This means, they want to own their elements. Consequentially, they have to copy their elements. When an element is copy-constructible, it is implicitly move-constructible beause copy kicks-in as fallback for move.
Rainer