The Next Great Migration: From C++ to Standard C++

By Al Stevens

Dr. Dobb's Journal September 1998

(a)
for (int i = 0; i < 5; i++) {
    // i is in scope
}
// i is no longer in scope
(b)
for (int i = 0; i < 5; i++) {
    // ...
}
if (i == 5) // OK with old C++, error with Standard C++
(c)
int i;  // outer i
if (abc)  {
    for (int i = 0; i < 5; i++) {
        // ...
    }
    if (i == 5) {   // inner i with old C++, outer i with Standard C++
        // ...
    }
}

Example 2: New rules for for.

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