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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 by a given allocator.

### [edit] Requirements

The type `T` is `CopyInsertable` into the container `X` whose `value_type` is identical to `T` if `T` is `MoveInsertable` into `X`, and, given

`A` | an allocator type
`m` | an lvalue of type `A`
`p` | the pointer of type `T*` prepared by the container
`v` | expression of type (possibly const) `T`

where `X::allocator_type` is identical to std::allocator_traits<A>::rebind_alloc<T>,

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 unchanged.

If `X` is not allocator-aware, the term is defined as if `A` were std::allocator<T>, except that no allocator object needs to be created, and user-defined specializations of std::allocator are not instantiated.

### [edit] Notes

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

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