int v[10] = {};

8.5.1/1
An aggregate is an array or a class (clause 9) with no user-declared constructors...

8.5.1/8
An empty initializer-list can be used to initialize any aggregate. If the aggregate is not an
empty class, then each member of the aggregate shall be initialized with a value of the form T() (5.2.3),
where T represents the type of the uninitialized member.