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# C++ concepts: CopyInsertable

From cppreference.com
< cpp‎ | concept

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);

And after evaluation, the value of *p is equivalent to the value of v. The value of v is not changed.

Note that if `A` is std::allocator<T>, then this will call placement-new, as by ::new((void*)p) T(v)

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