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Showing content from https://timsong-cpp.github.io/cppwp/n4659/meta.unary.prop.query below:

[meta.unary.prop.query]

23 General utilities library [utilities] 23.15 Metaprogramming and type traits [meta] 23.15.5 Type property queries [meta.unary.prop.query]

This subclause contains templates that may be used to query properties of types at compile time.

Table

— Type property queries

Template Value template <class T> struct alignment_of; alignof(T).
Requires: alignof(T) shall be 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

Each of these templates shall be a UnaryTypeTrait with a base characteristic of integral_constant<size_t, Value>.

[ Example:

assert(rank_v<int> == 0);
assert(rank_v<int[2]> == 1);
assert(rank_v<int[][4]> == 2);

— end example ]

[ Example:

assert(extent_v<int> == 0);
assert(extent_v<int[2]> == 2);
assert(extent_v<int[2][4]> == 2);
assert(extent_v<int[][4]> == 0);
assert((extent_v<int, 1>) == 0);
assert((extent_v<int[2], 1>) == 0);
assert((extent_v<int[2][4], 1>) == 4);
assert((extent_v<int[][4], 1>) == 4);

— end example ]

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