C ошибка c4716

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#ifndef __COMPLEX_H__
#define __COMPLEX_H__
 
#include <iostream>
 
template <typename T>
class Complex
{
    template <typename U>
    friend std::istream& operator >> (std::istream&, Complex<U>&);
 
public:
    explicit Complex(const T& re, const T& im);
    Complex(const Complex& other);
 
    Complex& operator=(const Complex& other);
 
    T real() const { return _re; }
    T imaginary() const { return _im; }
 
    Complex conjugate() const { return Complex(_re, -_im); }
 
    Complex& operator+= (const Complex& other);
    Complex& operator-= (const Complex& other);
    Complex& operator*= (const Complex& other);
    Complex& operator/= (const Complex& other);
 
    Complex operator+ (const Complex& other);
    Complex operator- (const Complex& other);
    Complex operator* (const Complex& other);
    Complex operator/ (const Complex& other);
 
private:
    T _re;
    T _im;
};
 
template <typename T>
inline Complex<T>::Complex(const T& re, const T& im)
    : _re(re), _im(im)
{
}
 
template <typename T>
inline Complex<T>::Complex(const Complex& other)
    : _re(other._re), _im(other._im)
{
}
 
template <typename T>
Complex<T>& Complex<T>::operator=(const Complex<T>& other)
{
    if (&other == this)
        return;
 
    _re = other._re;
    _im = other._im;
 
    return *this;
}
 
template <typename T>
inline Complex<T>& Complex<T>::operator+= (const Complex<T>& other)
{
    _re += other._re;
    _im += other._im;
}
 
template <typename T>
inline Complex<T>& Complex<T>::operator-= (const Complex<T>& other)
{
    _re -= other._re;
    _im -= other._im;
}
 
template <typename T>
inline Complex<T>& Complex<T>::operator*= (const Complex<T>& other)
{
    _re = _re * other._re - _im * other._im;
    _im = _im * other._re + _re * other._im;
}
 
template <typename T>
inline Complex<T>& Complex<T>::operator/= (const Complex<T>& other)
{
    _re = (_re * other._re - _im * other._im) /
        (other._re * other._re + other._im * other._im);
    _im = (_im * other._re - _re * other._im) /
        (other._re * other._re + other._im * other._im);
}
 
template <typename T>
inline Complex<T> Complex<T>::operator+ (const Complex<T>& other)
{
    return Complex<T>(*this) += other;
}
 
template <typename T>
inline Complex<T> Complex<T>::operator- (const Complex<T>& other)
{
    return Complex<T>(*this) -= other;
}
 
template <typename T>
inline Complex<T> Complex<T>::operator* (const Complex<T>& other)
{
    return Complex<T>(*this) *= other;
}
 
template <typename T>
inline Complex<T> Complex<T>::operator/ (const Complex<T>& other)
{
    return Complex<T>(*this) /= other;
}
 
template <typename T>
std::istream& operator >> (std::istream& in, Complex<T>& c)
{
    return in >> c._re >> c._im;
}
 
template <typename T>
std::ostream& operator<< (std::ostream& out, const Complex<T>& c)
{
    return out << c.real() << " " << c.imaginary();
}
 
#endif //__COMPLEX_H__

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template <typename T>
 Complex<T> abs(const Complex<T>& _ComplexNum)

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    float abs() // Модуль комплексного числа
    {
        return sqrt(_re * _re + _im * _im);
    }

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template <typename T>
T Complex<T>::modulus(){
return pow(_re * _re + _im * _im, 0.5);
}

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return sqrt(_re * _re + _im * _im);

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T  modulus();

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#include <iostream>
#include "stdafx.h"
#include "complex.h"
 
int main()
{
    Complex<int> a(12, 34), b(12, -24);
    Complex<float> c;
 
    c = a;
 
    std::cout << a + b << std::endl << a - b << std::endl << a * b << std::endl << a / b << std::endl;
 
    std::cin.get();
 
    return 0;
}

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#include <iostream>
using namespace std;
template<typename T>
class Compl{
public:
T re_,im_;
Compl(T rea_, T img_):re_(rea_), im_(img_){}
 
template<typename U>
Compl& operator+(Compl<U>&);
};
 
template<typename T>
template<typename U>
Compl<T>& Compl<T>::
operator+(Compl<U>& rhs){
 
    re_+=rhs.re_;
    im_+=rhs.im_;
    return *this;
}
 
int main(int argc, char* argv[])
{
Compl<double> a(1,2);
Compl<float> b(2,3);
Compl<double>c(0,0);
c=a+b;
cout<<c.re_<<" "<<c.im_ <<endl;
system("pause");
return 0;
}

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#include "stdafx.h"

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class Compl

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#include <iostream>
using namespace std;
template<typename T>
class Compl{
public:
T re_,im_;
Compl(T rea_, T img_):re_(rea_), im_(img_){}
 
Compl& operator+=(const Compl&);//тут ссылка возвращается
Compl operator+(const Compl&);//тут объект возвращается
 
template<typename U>
Compl operator+(const Compl<U>&);//и тут объект возвращается
};
 
template<typename T> 
Compl<T>& Compl<T>::
operator+=(const Compl& rhs){
    re_+=rhs.re_;
    im_+=rhs.im_;
    return *this;
}
 
 
template<typename T> 
Compl<T> Compl<T>::
operator+(const Compl& rhs){
Compl<T> ret(*this);
    ret.re_+=rhs.re_;
    ret.im_+=rhs.im_;
    return ret;
}
 
template<typename T>
template<typename U>
Compl<T> Compl<T>::
operator+(const Compl<U>& rhs){
Compl<T> ret(*this);
    ret.re_+=rhs.re_;
    ret.im_+=rhs.im_;
    return ret;
}
int main(int argc, char* argv[])
{
Compl<double> a(1,2);
Compl<float> b(2,3);
Compl<double>c(0,0);
c=a+b;
 
cout<<c.re_<<" "<<c.im_ <<endl;
system("pause");
return 0;
}