Complex.h #pragma once
#include<iostream>
using namespace std;//这句还必须加,要不然致错,不懂为啥呢 template <typename T>
class Complex
{
public:
Complex( T a);
~Complex();
Complex operator + (Complex & c1);
public:
friend ostream & operator << <T> (ostream &out, Complex & c2);
private:
T a;
};
Complex.cpp #include "Complex.h"
template <typename T>
Complex<T>::Complex(T a )
{
this->a = a;
} template <typename T>
Complex<T>::~Complex()
{
} template <typename T>
Complex<T> Complex<T> ::operator + (Complex<T> & c1)
{
this->a = this->a + c1.a;
return *this;
} template <typename T>
ostream & operator << (ostream &out, Complex <T> & c2)
{
out << c2.a;
return out;
}
test.cpp #include<iostream>
#include"Complex.cpp"//这里至关重要!!!
using namespace std; int main()
{
Complex <int> a(5); cout << a;
system("pause");
return 0;
}
要包含.cpp这点异于常类 易错误