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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>