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template <class T>
struct is_default_constructible : public true_type-or-false_type {};

Inherits: If T can be default-constructed then inherits from true_type, otherwise inherits from false_type. Type T must be a complete type.

Compiler Compatibility: This trait requires the C++11 feature decltype support for full support. While there is some fallback code for cases where this is not the case, the trait should really be considered broken in that case.

Header: #include <boost/type_traits/is_copy_constructible.hpp> or #include <boost/type_traits.hpp>