C＆＃x2B;＆＃x2B;操作员重载错误：＆＃x2018;运算符无匹配（操作数类型是＆＃x2018; float＆＃x2019; and＆＃x2018; class＆＃x2019;）
我正在研究一些OOP代码，并试图用操作员＆gt;＆gt;设置istream＆amp;。但是有了我的代码，我会不断遇到一个错误，就像标题中上面所述的那样。我必须执行此操作的代码是：
istream& operator>>(istream& in, Forward& fwd){
in >> fwd.value;
cerr << "Value in forward is: " << fwd.value;
return in;
}
此代码是forward类的一部分，value是base类的成员变量，称为命令 ，哪个forward正在继承。
然后，我尝试在其他类中使用此操作员，program类：
istream& operator>>(istream& in, Program& prog){
float value = 4;
Forward *temp = new Forward();
value >> *temp;
}
但这给了我错误：
错误：“操作员＆gt;＆gt;''无匹配（操作数类型是“ float”和“向前”）
和
没有已知的参数转换为“ float”到'std :: istream＆amp; {aka std :: basic_istream＆amp;}'
注：我需要保持行fortht *temp = new forned（）;，因为它在代码中经常使用。
I'm working on some OOP code and was trying to setup a istream& with the operator >>. But with the code that I have, I keep getting an error, like the one stated above in the title. The code I have to do this is:
istream& operator>>(istream& in, Forward& fwd){
in >> fwd.value;
cerr << "Value in forward is: " << fwd.value;
return in;
}
This code is part of the Forward class and value is a member variable of the base class called Command, which Forward is inheriting from.
I then tried to use this operator in a different class, the Program class:
istream& operator>>(istream& in, Program& prog){
float value = 4;
Forward *temp = new Forward();
value >> *temp;
}
But this gave me the errors:
error: no match for ‘operator>>’ (operand types are ‘float’ and ‘Forward’)
and
no known conversion for argument 1 from ‘float’ to ‘std::istream& {aka std::basic_istream&}’
Note: I need to keep the line Forward *temp = new Forward(); because it is used a lot in the code.
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