C ++ cast into the void

As I understand it, the C ++ standard says that the cast to void

is correct only in the case of function-style casting

No, it can be done with static_cast

, and therefore also with, conversions using functional or cast designations.

But I can't find anything about the C style being different from void

in the C ++ standard.

It is defined for static_cast

in [expr.static.cast], 5.2.9 / 6:

Any expression can be explicitly converted to type cv void

, in which case it becomes the discarded value of the expression.

[expr.cast], 5.4, describes how C-style casting can use static_cast

, so it is also valid for that style. [expr.type.conv], 5.2.3, describes how the functional style is equivalent to the C style, so it is also valid for that style.

_{(Note: section numbers refer to C ++ 11 (ISO / IEC 14882: 2011), not the C ++ 03 you are linking to, as the current version. Other versions may differ, but maybe a lot.) >}