有操作员时，'='没有可行的重载

Question

struct myType{
public:    

    myType operator=(const myType &value){
        return value;
    };

};

myType has an operator overload for = but when it is called in the JSON class at it = js.allInfo.begin(); compiler throws: "No viable overload for '='"

class JSON{

private:
vector<myType> allInfo;

public:    

friend ostream &operator<<(ostream &os,const JSON &js)
{
    vector<myType>::iterator it;

    for(it = js.allInfo.begin(); it != js.allInfo.end();it++){
        cout << "this is the info "<<(it->getNAME()) << endl;
    }
    return os;
};

What should I change in the overload= to fix this problem

Answer 1

You're trying to iterate a const object (const JSON &js) with a non-const iterator.

Use a const iterator:

vector<myType>::const_iterator it;

Better yet, use the keyword "auto" to automatically get the proper type:

auto it = js.allInfo.begin()