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# C++ concepts: EmplaceConstructible (since C++11)

From cppreference.com
< cpp‎ | concept

Specifies that an object of the type can be constructed from a given set of arguments in uninitialized storage by a given allocator.

### [edit] Requirements

The type `T` is `EmplaceConstructible` into the `Container` `X` (whose `value_type` is identical to `T`) from the arguments `args` if, given

`A` | an allocator type
`m` | an lvalue of type `A`
`p` | the pointer of type `T*` prepared by the container
`args` | zero or more arguments

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, args);

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] See Also

`CopyInsertable`
`MoveInsertable`

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