Add these expressions to yours .emacsor rate them with M-:.
Size (which is easier of two cases)
A regular expression identifies any combination (indicated by a parenthesis expression [...], with respect to syntax, see note below) alphanumeric, spaces and asterisks in parentheses and preceding ones sizeof.
(font-lock-add-keywords 'c++-mode
'(("\\<sizeof[[:space:]]*(\\([[:alnum:][:space:]*]+\\))"
1 font-lock-type-face t)))
1 emacs ( \\(...\\)) face font-lock-type-face; t .
M-x customize group [RET] font-lock-faces [RET].
++
, , , ndash; "" , . :
(font-lock-add-keywords 'c++-mode
'(("\\<[[:alnum:]]+_cast[[:space:]]*<\\([[:alnum:][:space:]*]+\\)>[[:space:]]*(\\([[:alnum:][:space:]*]+\\))"
(1 font-lock-type-face t)
(2 font-lock-type-face t))))
, '1 and 2` .
: ++. , emacs , sizeof(int * 32).
, , ; sizeof , . , , C .