Comment by int_19h

C-style for-loop is kinda sorta this. Although the "prepare" part has to be an expression rather than a statement, given that you have the comma operator and ?: you can do a lot there even in C. In C++, you can always stick a statement in expression context by using a lambda. So:

    for ([]{
        /*prepare*/
    }(); /*condition*/;) {
        /*body*/
    }

However, the most interesting take on loops that I've seen is in Sather, where they are implemented on top of what are, essentially, coroutines, with some special facilities that make it possible to exactly replicate the semantics of the usual `while`, `break` etc in this way: https://www.gnu.org/software/sather/docs-1.2/tutorial/iterat...