in C++ can i add a note that a reference variable is no longer valid

Question

I recently had a bug in my code caused by me resizing a vector and I had a variable that was referencing one of its elements. I found the bug, but was wondering if there is a way to tell the compiler/IDE to throw an error if a variable is used after a specific point?

Totally stupid example, but shows what I mean:

vector<int> a{0,1,2,3,4,5,6,7,8,9};
for (auto &value: a) {
    int copy=value;  //totally stupid but makes sense if vector<int> was actually a vector<some big class> and we are only copying one value
    if (value==5) a.resize(a.size()+5);
    ///value may no longer be valid after this point throw error if try to use value
    
    //can do stuff with copy but not value here
}

Answer 1

A way to achieve this is to take your file, change the variables that you want to track for future use, for example, if you want to track a variable called foo, rename it to foo_test in all its occurrences prior to the point you are interested about and try compiling/building/testing. If you get an error saying that foo was not defined, then it is used later. If you do not get such an error, you are no longer using it.