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template <class T>
struct is_complex : public true_type-or-false_type {};
        Inherits: If T
        is a complex number type then true (of type std::complex<U>
        for some type U), otherwise
        false.
      
C++ Standard Reference: 26.2.
Compiler Compatibility: All current compilers are supported by this trait.
        Header:  #include
        <boost/type_traits/is_complex.hpp>
        or  #include <boost/type_traits.hpp>