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[iter] Add hb_take()

This commit is contained in:
Behdad Esfahbod 2019-08-31 12:42:52 -05:00
parent 1f88dae9f5
commit 875131d478
2 changed files with 11 additions and 2 deletions
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12
src/hb-iter.hh
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@ -664,7 +664,7 @@ struct hb_iota_iter_t :
template <typename S2 = S> template <typename S2 = S>
auto auto
inc (S s, hb_priority<1>) inc (hb_type_identity<S2> s, hb_priority<1>)
-> hb_void_t<decltype (hb_invoke (hb_forward<S2> (s), hb_declval<T&> ()))> -> hb_void_t<decltype (hb_invoke (hb_forward<S2> (s), hb_declval<T&> ()))>
{ v = hb_invoke (hb_forward<S2> (s), v); } { v = hb_invoke (hb_forward<S2> (s), v); }
@ -728,7 +728,7 @@ struct
} }
HB_FUNCOBJ (hb_repeat); HB_FUNCOBJ (hb_repeat);
/* hb_enumerate */ /* hb_enumerate()/hb_take() */
struct struct
{ {
@ -739,6 +739,14 @@ struct
( hb_zip (hb_iota (start), it) ) ( hb_zip (hb_iota (start), it) )
} }
HB_FUNCOBJ (hb_enumerate); HB_FUNCOBJ (hb_enumerate);
struct
{ HB_PARTIALIZE(2);
template <typename Iterable,
hb_requires (hb_is_iterable (Iterable))>
auto operator () (Iterable&& it, unsigned count) const HB_AUTO_RETURN
( hb_zip (hb_range (count), it) | hb_map (hb_second) )
}
HB_FUNCOBJ (hb_take);
/* hb_sink() */ /* hb_sink() */

1
src/test-iter.cc
View File

@ -272,6 +272,7 @@ main (int argc, char **argv)
hb_repeat (7u); hb_repeat (7u);
hb_repeat (nullptr); hb_repeat (nullptr);
hb_repeat (vl); hb_repeat (vl);
assert ((hb_range (10) | hb_take (3)).len () == 3);
assert (hb_range (9).len () == 9); assert (hb_range (9).len () == 9);
assert (hb_range (2, 9).len () == 7); assert (hb_range (2, 9).len () == 7);
assert (hb_range (2, 9, 3).len () == 3); assert (hb_range (2, 9, 3).len () == 3);