7 Expressions [expr]

7.6 Compound expressions [expr.compound]

7.6.2 Unary expressions [expr.unary]

7.6.2.1 General [expr.unary.general]

Expressions with unary operators group right-to-left.

unary-expression:
postfix-expression
unary-operator cast-expression
++ cast-expression
-- cast-expression
await-expression
sizeof unary-expression
sizeof ( type-id )
sizeof ... ( identifier )
alignof ( type-id )
noexcept-expression
new-expression
delete-expression

unary-operator: one of
* & + - ! ~