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Showing content from https://timsong-cpp.github.io/cppwp/n4659/meta.trans.arr below:

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23 General utilities library [utilities] 23.15 Metaprogramming and type traits [meta] 23.15.7 Transformations between types [meta.trans] 23.15.7.4 Array modifications [meta.trans.arr]

Table

48

— Array modifications


Template Comments template <class T>
struct remove_­extent; If T names a type “array of U”, the member typedef type shall be U, otherwise T. [ Note: For multidimensional arrays, only the first array dimension is removed. For a type “array of const U”, the resulting type is const U.  — end note ] template <class T>
struct remove_­all_­extents; If T is “multi-dimensional array of U”, the resulting member typedef type is U, otherwise T.

[ Example:

assert((is_same_v<remove_extent_t<int>, int>));
assert((is_same_v<remove_extent_t<int[2]>, int>));
assert((is_same_v<remove_extent_t<int[2][3]>, int[3]>));
assert((is_same_v<remove_extent_t<int[][3]>, int[3]>));

 — end example ]

[ Example:

assert((is_same_v<remove_all_extents_t<int>, int>));
assert((is_same_v<remove_all_extents_t<int[2]>, int>));
assert((is_same_v<remove_all_extents_t<int[2][3]>, int>));
assert((is_same_v<remove_all_extents_t<int[][3]>, int>));

 — end example ]

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