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authorKenneth Heafield <github@kheafield.com>2013-06-18 11:34:20 -0700
committerKenneth Heafield <github@kheafield.com>2013-06-18 11:34:20 -0700
commit8dc383a74c12d44ab3f51947575ed5828653f4f1 (patch)
tree30371d17e6c2daf3837068b2617e357ad6b37d89 /klm/util/proxy_iterator.hh
parent354787aa16539702802b9ea075c4bd8a72071035 (diff)
lazy dd880b4 including kenlm 6eef0f1
Diffstat (limited to 'klm/util/proxy_iterator.hh')
-rw-r--r--klm/util/proxy_iterator.hh25
1 files changed, 15 insertions, 10 deletions
diff --git a/klm/util/proxy_iterator.hh b/klm/util/proxy_iterator.hh
index 121a45fa..0ee1716f 100644
--- a/klm/util/proxy_iterator.hh
+++ b/klm/util/proxy_iterator.hh
@@ -6,11 +6,11 @@
/* This is a RandomAccessIterator that uses a proxy to access the underlying
* data. Useful for packing data at bit offsets but still using STL
- * algorithms.
+ * algorithms.
*
* Normally I would use boost::iterator_facade but some people are too lazy to
* install boost and still want to use my language model. It's amazing how
- * many operators an iterator has.
+ * many operators an iterator has.
*
* The Proxy needs to provide:
* class InnerIterator;
@@ -22,15 +22,15 @@
* operator<(InnerIterator)
* operator+=(std::ptrdiff_t)
* operator-(InnerIterator)
- * and of course whatever Proxy needs to dereference it.
+ * and of course whatever Proxy needs to dereference it.
*
- * It's also a good idea to specialize std::swap for Proxy.
+ * It's also a good idea to specialize std::swap for Proxy.
*/
namespace util {
template <class Proxy> class ProxyIterator {
private:
- // Self.
+ // Self.
typedef ProxyIterator<Proxy> S;
typedef typename Proxy::InnerIterator InnerIterator;
@@ -38,16 +38,21 @@ template <class Proxy> class ProxyIterator {
typedef std::random_access_iterator_tag iterator_category;
typedef typename Proxy::value_type value_type;
typedef std::ptrdiff_t difference_type;
- typedef Proxy reference;
+ typedef Proxy & reference;
typedef Proxy * pointer;
ProxyIterator() {}
- // For cast from non const to const.
+ // For cast from non const to const.
template <class AlternateProxy> ProxyIterator(const ProxyIterator<AlternateProxy> &in) : p_(*in) {}
explicit ProxyIterator(const Proxy &p) : p_(p) {}
- // p_'s operator= does value copying, but here we want iterator copying.
+ // p_'s swap does value swapping, but here we want iterator swapping
+ friend inline void swap(ProxyIterator<Proxy> &first, ProxyIterator<Proxy> &second) {
+ swap(first.I(), second.I());
+ }
+
+ // p_'s operator= does value copying, but here we want iterator copying.
S &operator=(const S &other) {
I() = other.I();
return *this;
@@ -72,8 +77,8 @@ template <class Proxy> class ProxyIterator {
std::ptrdiff_t operator-(const S &other) const { return I() - other.I(); }
- Proxy operator*() { return p_; }
- const Proxy operator*() const { return p_; }
+ Proxy &operator*() { return p_; }
+ const Proxy &operator*() const { return p_; }
Proxy *operator->() { return &p_; }
const Proxy *operator->() const { return &p_; }
Proxy operator[](std::ptrdiff_t amount) const { return *(*this + amount); }