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[iter] Add hb_unzip()

This commit is contained in:
Behdad Esfahbod 2019-03-29 21:36:49 -07:00
parent f1dad91eb3
commit 6237b47f0c
1 changed files with 38 additions and 0 deletions
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38
src/hb-iter.hh
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@ -478,6 +478,8 @@ static const struct
{ return hb_sink_t<Sink&> (*s); }
} hb_sink HB_UNUSED;
/* hb-drain: hb_sink to void / blackhole / /dev/null. */
static const struct
{
template <typename Iter,
@ -490,6 +492,42 @@ static const struct
}
} hb_drain HB_UNUSED;
/* hb_unzip(): unzip and sink to two sinks. */
template <typename Sink1, typename Sink2>
struct hb_unzip_t
{
hb_unzip_t (Sink1&& s1, Sink2&& s2) : s1 (s1), s2 (s2) {}
template <typename Iter,
hb_enable_if (hb_is_iterator (Iter))>
void
operator () (Iter it) const
{
for (; it; ++it)
{
const auto &v = *it;
s1 << v.first;
s2 << v.second;
}
}
private:
Sink1 s1;
Sink2 s2;
};
static const struct
{
template <typename Sink1, typename Sink2> hb_unzip_t<Sink1, Sink2>
operator () (Sink1&& s1, Sink2&& s2) const
{ return hb_unzip_t<Sink1, Sink2> (s1, s2); }
template <typename Sink1, typename Sink2> hb_unzip_t<Sink1&, Sink2&>
operator () (Sink1 *s1, Sink2 *s2) const
{ return hb_unzip_t<Sink1&, Sink2&> (*s1, *s2); }
} hb_unzip HB_UNUSED;
/* hb-all, hb-any, hb-none. */
static const struct