From 2f6ac6f232967a94ea013b853a296cc38be07e6c Mon Sep 17 00:00:00 2001
From: Allison Vacanti <alliepiper16@gmail.com>
Date: Tue, 4 Aug 2020 16:09:53 -0400
Subject: [PATCH] Add iterator_*_t helpers for iterator traits.

- iterator_value_t
- iterator_pointer_t
- iterator_reference_t
- iterator_difference_t
- iterator_system_t
---
 thrust/iterator/detail/iterator_traits.inl | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/thrust/iterator/detail/iterator_traits.inl b/thrust/iterator/detail/iterator_traits.inl
index 8a9cc4ffb0..2d3cd5773e 100644
--- a/thrust/iterator/detail/iterator_traits.inl
+++ b/thrust/iterator/detail/iterator_traits.inl
@@ -33,6 +33,8 @@ template<typename Iterator>
   typedef typename thrust::iterator_traits<Iterator>::value_type type;
 }; // end iterator_value
 
+template <typename Iterator>
+using iterator_value_t = typename iterator_value<Iterator>::type;
 
 template<typename Iterator>
   struct iterator_pointer
@@ -40,6 +42,8 @@ template<typename Iterator>
   typedef typename thrust::iterator_traits<Iterator>::pointer type;
 }; // end iterator_pointer
 
+template <typename Iterator>
+using iterator_pointer_t = typename iterator_pointer<Iterator>::type;
 
 template<typename Iterator>
   struct iterator_reference
@@ -47,6 +51,8 @@ template<typename Iterator>
   typedef typename iterator_traits<Iterator>::reference type;
 }; // end iterator_reference
 
+template <typename Iterator>
+using iterator_reference_t = typename iterator_reference<Iterator>::type;
 
 template<typename Iterator>
   struct iterator_difference
@@ -54,6 +60,9 @@ template<typename Iterator>
   typedef typename thrust::iterator_traits<Iterator>::difference_type type;
 }; // end iterator_difference
 
+template <typename Iterator>
+using iterator_difference_t = typename iterator_difference<Iterator>::type;
+
 namespace detail
 {
 
@@ -90,6 +99,8 @@ template<>
   typedef thrust::iterator_system<const int*>::type type;
 }; // end iterator_system<void*>
 
+template <typename Iterator>
+using iterator_system_t = typename iterator_system<Iterator>::type;
 
 template <typename Iterator>
   struct iterator_traversal