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16.2.4 Variable Scoping in For Loops
C++ has always permitted the declaration of a control variable in the
initializer section of for loops:
for (int i = 0; i < 100; i++)
{
...
}
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The original language specification allowed the control variable to remain live until the end of the scope of the loop itself:
for (int i = 0; i < j; i++)
{
if (some condition)
break;
}
if (i < j)
// loop terminated early
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In a later specification of the language, the control variable's scope
only exists within the body of the for loop. The simple
resolution to this incompatible change is to not use the older style.
If a control variable needs to be used outside of the loop body, then
the variable should be defined before the loop:
int i;
for (i = 0; i < j; i++)
{
if (some condition)
break;
}
if (i < j)
// loop terminated early
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