基于范围的循环声明必须声明一个变量

Question

BYTE Function::Function(long MyInt)
{
    std::vector<int> Red = { 6, 8 };

    for (MyInt : Red)
    {
        return 1;
    }

    return 0;
}

This is my function. I want to use MyInt intro for range, but I get a strange error.

I get this error ; error: for range

declaration must declare a variable

What is wrong here? I can't understand.

Answer 1

_{What are you trying to do? This doesn't make sense to me, why would you start a loop to end it immediately by returning?}

Well, you can't use an existing variable in a ranged for loop, you have to declare a new one:

for (long myint : Red)
{
    //...
}

You could also use the same name for (long MyInt : Red) , but that can confuse people into thinking that MyInt and MyInt are the same variables, which isn't good.