# std::CopyConstructible

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< cpp‎ | concepts

Defined in header `<concepts>` |  |
template <class T> concept CopyConstructible = std::MoveConstructible<T> && std::Constructible<T, T&> && std::ConvertibleTo<T&, T> && std::Constructible<T, const T&> && std::ConvertibleTo<const T&, T> && std::Constructible<T, const T> && std::ConvertibleTo<const T, T>; |  | (since C++20)

The concept `CopyConstructible` is satisfied if `T` is an lvalue reference type, or if it is a `MoveConstructible` object type where an object of that type can constructed from a (possibly const) lvalue or const rvalue of that type in both direct- and copy-initialization contexts with the usual semantics (a copy is constructed with the source unchanged).

More precisely, if `T` is an object type, then `CopyConstructible<T>` is satisfied only if given

- `v`, a lvalue of type (possibly const) `T` or an rvalue of type const T,

the following are true:

- After the definition T u = v;, `u` is equal to `v`;
- `T(v)` is equal to `v`.

### See also

is_copy_constructible is_trivially_copy_constructible is_nothrow_copy_constructible (C++11)(C++11)(C++11) | checks if a type has a copy constructor (class template)

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