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### is_default_constructible

    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>`