C++ concepts: CopyInsertable
From cppreference.com
Specifies that an instance of the type can be copy-constructed in-place, in uninitialized storage.
[edit] Requirements
The type T is CopyInsertable into the container X if, given
| A | the allocator type defined as X::allocator_type |
| m | the lvalue of type A obtained from X::get_allocator() |
| p | the pointer of type T* prepared by the container |
| v | expression of type T, provided as the argument to push_back(), etc |
the following expression is well-formed:
std::allocator_traits<A>::construct(m, p, v);
Note that if A is std::allocator<T>, then this will call placement-new, as by ::new((void*)p) T(v)
