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:
T u = v;, u is equal to v; T(v) is equal to v. |
(C++11)(C++11)(C++11) | checks if a type has a copy constructor (class template) |
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http://en.cppreference.com/w/cpp/concepts/CopyConstructible