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[iter] Default projection to identity

This commit is contained in:
Behdad Esfahbod 2019-01-09 19:49:13 -08:00
parent a699c6b17c
commit 83cecd80d9
2 changed files with 5 additions and 5 deletions
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6
src/hb-algs.hh
View File

@ -31,7 +31,7 @@
#include "hb-null.hh"
static HB_UNUSED struct
static HB_UNUSED struct hb_identity_t
{
template <typename T> T
operator () (const T& v) const { return v; }
@ -55,13 +55,13 @@ struct hb_pair_t
template <typename T1, typename T2> static inline hb_pair_t<T1, T2>
hb_pair (T1 a, T2 b) { return hb_pair_t<T1, T2> (a, b); }
static HB_UNUSED struct
static HB_UNUSED struct hb_first_t
{
template <typename Pair> typename Pair::first_t
operator () (const Pair& pair) const { return pair.first; }
} hb_first;
static HB_UNUSED struct
static HB_UNUSED struct hb_second_t
{
template <typename Pair> typename Pair::second_t
operator () (const Pair& pair) const { return pair.second; }

4
src/hb-iter.hh
View File

@ -280,9 +280,9 @@ struct hb_filter_iter_factory_t
Pred p;
Proj f;
};
template <typename Pred, typename Proj>
template <typename Pred, typename Proj = hb_identity_t&>
inline hb_filter_iter_factory_t<Pred, Proj>
hb_filter (Pred&& p, Proj&& f)
hb_filter (Pred&& p, Proj&& f = hb_identity)
{ return hb_filter_iter_factory_t<Pred, Proj> (p, f); }
/* hb_zip() */