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template <class T>
struct is_nothrow_move_assignable : public true_type-or-false_type {};
        Inherits: If T
        is a (possibly cv-qualified) type with a non-throwing move assignment-operator
        or a type without move assignment-operator but with non-throwing assignment-operator,
        then inherits from true_type,
        otherwise inherits from false_type.
        Type T must be a complete
        type.
      
        In other words, inherits from true_type
        only if expression variable1 = std::move(variable2) won't throw (variable1
        and variable2 are variables
        of type T).
      
Compiler Compatibility: If the compiler does not support partial-specialization of class templates, then this template can not be used with function types.
        Without some (C++11 noexcept shall work correctly) help from the compiler,
        is_nothrow_move_assignable
        will never report that a class or struct has a non-throwing assignment-operator;
        this is always safe, if possibly sub-optimal. Currently (June 2015) MSVC-12.0,
        Clang and GCC 4.7 have the necessary compiler support to ensure that this
        trait "just works".
      
        Header:  #include
        <boost/type_traits/is_nothrow_move_assignable.hpp>
        or  #include <boost/type_traits.hpp>