C++ 复杂类的运算符>>中的不明确重载

C++ Ambiguous overload in operator>> for complex class

本文关键字：gt 不明确 重载 复杂 C++ 运算符      更新时间：2023-10-16

无论我做什么，我都会不断地得到一个不明确的重载错误。。。。这是我的代码

COMPLEX.cpp代码

template<class C> class complex
{  
    C real,imag;
    public:
    //constructors
    complex(C real=0,C imag=0)
    {
        complex::real=real;
        complex::imag=imag;
    }
    complex(const complex& cmplx)
    {
        real=cmplx.real;
        imag=cmplx.imag;
    }
    //functions available
    complex<C> operator+(const complex&);
    complex<C> operator+(double);
    void operator=(const complex&);
    //friend functions available
    template<class F> friend complex<F> operator+(double,const complex<F>&);
    template<class F> friend istream& operator>>(istream&,const complex<F>&);
    template<class F> friend ostream& operator<<(ostream&,const complex<F>&);
 };

OPERATOR>>实现

template<class F> istream& operator>>(istream& cin,const complex<F>& cmplx)
{
    cout<<"nenter real part followed by imaginary part : ";
    cin>>cmplx.real>>cmplx.imag;
    return cin;
}

MAIN方法

int main(void)
{
    complex<int> C1;
    complex<int> C2;
    complex<int> C3;
    cin>>C1>>C2>>C3;
    cout<<C1<<C2<<C3;
    C1=C1+3;
    C2=2+C2;
    C3=C1+C2;
    cout<<C1<<C2<<C3;
    complex<int> C4(C3);
    cout<<C4;
    return 0;   
}

编译器错误

COMPLEX.cpp: In function ‘std::istream& operator>>(std::istream&, const complex<C>&) [with F = int, std::istream = std::basic_istream<char>]’:
COMPLEX.cpp:91:7:   instantiated from here
COMPLEX.cpp:75:2: error: ambiguous overload for ‘operator>>’ in ‘cin >> cmplx.complex<int>::real’
COMPLEX.cpp:75:2: note: candidates are:
/usr/include/c++/4.6/istream:122:7: note: std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__istream_type& (*)(std::basic_istream<_CharT, _Traits>::__istream_type&)) [with _CharT = char, _Traits = std::char_traits<char>, std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>] <near match>
/usr/include/c++/4.6/istream:122:7: note:   no known conversion for argument 1 from ‘const int’ to ‘std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&) {aka std::basic_istream<char>& (*)(std::basic_istream<char>&)}’
/usr/include/c++/4.6/istream:126:7: note: std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__ios_type& (*)(std::basic_istream<_CharT, _Traits>::__ios_type&)) [with _CharT = char, _Traits = std::char_traits<char>, std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>, std::basic_istream<_CharT, _Traits>::__ios_type = std::basic_ios<char>] <near match>
/usr/include/c++/4.6/istream:126:7: note:   no known conversion for argument 1 from ‘const int’ to ‘std::basic_istream<char>::__ios_type& (*)(std::basic_istream<char>::__ios_type&) {aka std::basic_ios<char>& (*)(std::basic_ios<char>&)}’
/usr/include/c++/4.6/istream:133:7: note: std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::ios_base& (*)(std::ios_base&)) [with _CharT = char, _Traits = std::char_traits<char>, std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>] <near match>
/usr/include/c++/4.6/istream:133:7: note:   no known conversion for argument 1 from ‘const int’ to ‘std::ios_base& (*)(std::ios_base&)’
/usr/include/c++/4.6/istream:241:7: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__streambuf_type*) [with _CharT = char, _Traits = std::char_traits<char>, std::basic_istream<_CharT, _Traits>::__streambuf_type = std::basic_streambuf<char>] <near match>
/usr/include/c++/4.6/istream:241:7: note:   no known conversion for argument 1 from ‘const int’ to ‘std::basic_istream<char>::__streambuf_type* {aka std::basic_streambuf<char>*}’

在此之前，我写了一个MIX.cpp和istream重载在那里工作得很好，尽管它几乎和这里一样。。。。

template<class F> istream& operator>>(istream& cin,const complex<F>& cmplx)
                                                   ^^^^^

这个常量是个问题-您需要在这里更改cmplx，它不能是常量。这就是编译器所抱怨的：cmplx.real就是该函数中的const int。

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