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template <class T, class... Args>
struct is_constructible : public true_type-or-false_type {};
        Inherits: If T
        can be constructed from Args,
        then inherits from true_type,
        otherwise inherits from false_type.
        Type T must be a complete
        type.
      
Formally the trait answers the question, is the expression:
T t(std::declval<Args>()...);
valid?
There are a number of important special cases for this trait:
is_constructible<T>::value
        Indicates whether T is default
        constructible, while:
      
is_constructible<T, const T&>::value
        Indicates whether T is copy-constructible,
        and:
      
is_constructible<T, T>::value
        Indicates whether T is move-constructible.
      
        Compiler Compatibility: This trait requires
        the C++11 features decltype
        variadic templates and SFINAE-expression 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. The header will define the
        macro BOOST_TT_IS_CONSTRUCTIBLE_CONFORMING
        when the full implementation is available.
      
        Header:  #include
        <boost/type_traits/is_constructible.hpp>
        or  #include <boost/type_traits.hpp>