C++: Set bool value only if not set

Question

I have code in my C++ application that generally does this:

bool myFlag = false;
while (/*some finite condition unrelated to myFlag*/) {
    if (...) {
               


        

Answer 1

You are most likely over-thinking the problem as others already mentioned, so let me do the same. The following might be faster if you can afford to double the statements unrelated to myFlag. In fact, you can get rid of myFlag. OK, here we go:

while (/*some finite condition*/) {
    if (...) {
        // statements
    } else {
        while (/*some finite condition*/) {
            if (...) {
               // statements, repeated
            }
        }
        // Do something (as if myFlag was true in the OPs example)
        break;
    }
}

As with all performance optimization: Measure, measure, measure!