7 Expressions [expr]

7.6 Compound expressions [expr.compound]

7.6.2 Unary expressions [expr.unary]

7.6.2.6 Alignof [expr.alignof]

1
#
An alignof expression yields the alignment requirement of its operand type.
The operand shall be a type-id representing a complete object type, or an array thereof, or a reference to one of those types.
2
#
The result is a prvalue of type std​::​size_t.
[Note 1: 
An alignof expression is an integral constant expression ([expr.const]).
The typedef-name std​::​size_t is declared in the standard header <cstddef> ([cstddef.syn], [support.types.layout]).
— end note]
3
#
When alignof is applied to a reference type, the result is the alignment of the referenced type.
When alignof is applied to an array type, the result is the alignment of the element type.
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