Question

嘿，我在istream重载函数中一直收到此错误：

ColorBlob.cpp: In function 'std::istream& operator>>(std::istream&, ColorBlob&)':
ColorBlob.cpp:204:17: error: cannot bind 'std::istream {aka std::basic_istream<char>}' lvalue to 'std::basic_istream<char>&&'
In file included from c:\program files (x86)\codeblocks\mingw\bin\../lib/gcc/min
gw32/4.7.1/include/c++/iostream:41:0,
                 from Color.h:14,
                 from ColorBlob.h:13,
                 from ColorBlob.cpp:11:
c:\program files (x86)\codeblocks\mingw\bin\../lib/gcc/mingw32/4.7.1/include/c++
/istream:866:5: error:   initializing argument 1 of 'std::basic_istream<_CharT,
_Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&&, _Tp&) [with _Ch
arT = char; _Traits = std::char_traits<char>; _Tp = Color**]'"

我的功能定义如下：

istream& operator>>(istream& istrm, ColorBlob& CB){

    double red,blue,green;
    cout << "Enter red value";
    cin >> red;
    cout << "Enter green value";
    cin >> green;
    cout << "Enter blue value";
    cin >> blue;
    CB.setColor(Color(red, green, blue));

    istrm >> CB.width;
    istrm >> CB.height;
    istrm >> CB.data;

    return istrm;
}

错误发生在“istrm＆gt;＆gt; CB.data”上，但它的宽度和高度都很好。

ColorBlob-＆gt;数据是Color的动态2D数组。

Answer 1

如果我理解正确，您正尝试在istream& operator>>(istream& istrm, ColorBlob& CB)和istream两个参数上致电Color**。这是不好的。您为istream&和ColorBlob&定义了此运算符，而不是istream&和Color**。

C ++使用2d数组重载对象上的istream运算符 - 无法绑定错误

1 个答案: