3 Terms and definitions [intro.defs]


⟨execution-time action⟩ read or modify the value of an object
[Note 1:
Only objects of scalar type can be accessed.
Reads of scalar objects are described in [conv.lval] and modifications of scalar objects are describred in [expr.ass], [expr.post.incr], and [expr.pre.incr].
Attempts to read or modify an object of class type typically invoke a constructor or assignment operator; such invocations do not themselves constitute accesses, although they may involve accesses of scalar subobjects.
— end note]