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template <class T>
struct has_trivial_move_constructor : public true_type-or-false_type {};
Inherits: If T is a (possibly cv-qualified) type with a trivial move-constructor then inherits from true_type, otherwise inherits from false_type.
        If a type has a trivial move-constructor then the constructor has the same
        effect as copying the bits of one object to the other: calls to the constructor
        can be safely replaced with a call to memcpy.
      
        Compiler Compatibility: Without some (as
        yet unspecified) help from the compiler, has_trivial_move_constructor will
        never report that a user-defined class or struct has a trivial constructor;
        this is always safe, if possibly sub-optimal. In addition C++11's decltype is required to correctly support
        deleted or private move constructors. Currently (June 2015) compilers that
        have the necessary intrinsics
        to ensure that this trait "just works" include Clang, GCC-5.1,
        and MSVC-12.0. You may also test to see if the necessary intrinsics
        are available by checking to see if the macro BOOST_HAS_TRIVIAL_MOVE_CONSTRUCTOR
        is defined.
      
        Header:  #include
        <boost/type_traits/has_trivial_move_constructor.hpp>
        or  #include <boost/type_traits.hpp>
      
Examples:
has_trivial_move_constructor<int>inherits fromtrue_type.
has_trivial_move_constructor<char*>::typeis the typetrue_type.
has_trivial_move_constructor<int (*)(long)>::valueis an integral constant expression that evaluates to true.
has_trivial_move_constructor<MyClass>::valueis an integral constant expression that evaluates to false.
has_trivial_move_constructor<T>::value_typeis the typebool.