[tab:meta.unary.prop.query]

Table 50: Type property queries [tab:meta.unary.prop.query]

🔗	Template	Value
🔗	template<class T> struct alignment_of;	alignof(T). Mandates: alignof(T) is a valid expression ([expr.alignof])
🔗	template<class T> struct rank;	If T names an array type, an integer value representing the number of dimensions of T; otherwise, 0.
🔗	template<class T, unsigned I = 0> struct extent;	If T is not an array type, or if it has rank less than or equal to I, or if I is 0 and T has type “array of unknown bound of U”, then 0; otherwise, the bound ([dcl.array]) of the $I^{th}$ dimension of T, where indexing of I is zero-based

20 General utilities library [utilities]