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Add hb_lidentity(), and rename hb_rvalue() to hb_ridentity()

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This commit is contained in:
Behdad Esfahbod 2019-05-09 12:43:57 -07:00
parent 00195a22ce
commit c9b287a867
3 changed files with 16 additions and 5 deletions
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15
src/hb-algs.hh
View File

@ -36,17 +36,28 @@
struct
{
/* Note. This is dangerous in that if it's passed an rvalue, it returns rvalue-reference. */
template <typename T> auto
operator () (T&& v) const HB_AUTO_RETURN ( hb_forward<T> (v) )
}
HB_FUNCOBJ (hb_identity);
struct
{
/* Like identity(), but only retains lvalue-references. Rvalues are returned as rvalues. */
template <typename T> T&
operator () (T& v) const { return v; }
template <typename T> hb_remove_reference<T>
operator () (T&& v) const { return v; }
}
HB_FUNCOBJ (hb_rvalue);
HB_FUNCOBJ (hb_lidentity);
struct
{
/* Like identity(), but always returns rvalue. */
template <typename T> hb_remove_reference<T>
operator () (T&& v) const { return v; }
}
HB_FUNCOBJ (hb_ridentity);
struct
{

4
src/hb-map.hh
View File

@ -221,14 +221,14 @@ struct hb_hashmap_t
+ hb_array (items, mask ? mask + 1 : 0)
| hb_filter (&item_t::is_real)
| hb_map (&item_t::key)
| hb_map (hb_rvalue)
| hb_map (hb_ridentity)
)
auto values () const HB_AUTO_RETURN
(
+ hb_array (items, mask ? mask + 1 : 0)
| hb_filter (&item_t::is_real)
| hb_map (&item_t::value)
| hb_map (hb_rvalue)
| hb_map (hb_ridentity)
)
protected:

2
src/test-iter.cc
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@ -164,7 +164,7 @@ main (int argc, char **argv)
test_iterator_non_default_constructable (hb_enumerate (hb_iter (st)));
test_iterator_non_default_constructable (hb_enumerate (hb_iter (st) + 1));
test_iterator_non_default_constructable (hb_iter (st) | hb_filter ());
test_iterator_non_default_constructable (hb_iter (st) | hb_map (hb_rvalue));
test_iterator_non_default_constructable (hb_iter (st) | hb_map (hb_lidentity));
assert (true == hb_all (st));
assert (false == hb_all (st, 42u));