Defined in header <concepts> | ||
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template < class T > concept DefaultConstructible = std::Constructible<T>; | (since C++20) |
The DefaultConstructible concept provides a shorthand for the common case when the question is whether a type can be constructed with no arguments.
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(C++20) | specifies that a variable of the type can be constructed from or bound to a set of argument types (concept) |
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(C++11)(C++11)(C++11) | checks if a type has a default constructor (class template) |
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http://en.cppreference.com/w/cpp/concepts/DefaultConstructible