std::DefaultConstructible (3) Linux Manual Page
std::DefaultConstructible – std::DefaultConstructible Synopsis Defined in header <concepts> template < class T > (since C++20) concept DefaultConstructible = std::Constructible<T>; The DefaultConstructible concept provides a shorthand for the common case when the question is whether a type can be constructed with no arguments. See also Constructible specifies that a variable of the type can be constructed…
