From e2c06aa2497e330bab1c1a03d02f7c5096eb5b0b Mon Sep 17 00:00:00 2001
From: Krystian Kuzniarek <krystian.kuzniarek@gmail.com>
Date: Tue, 13 Aug 2019 23:12:51 +0200
Subject: [PATCH] remove a custom implementation of std::iterator_traits

---
 googletest/include/gtest/gtest-param-test.h   |  6 +++---
 .../include/gtest/internal/gtest-port.h       | 21 -------------------
 googletest/test/googletest-port-test.cc       | 18 ----------------
 3 files changed, 3 insertions(+), 42 deletions(-)

diff --git a/googletest/include/gtest/gtest-param-test.h b/googletest/include/gtest/gtest-param-test.h
index d7c9dd8c..c2e6eae3 100644
--- a/googletest/include/gtest/gtest-param-test.h
+++ b/googletest/include/gtest/gtest-param-test.h
@@ -174,6 +174,7 @@ TEST_P(DerivedTest, DoesBlah) {
 
 #endif  // 0
 
+#include <iterator>
 #include <utility>
 
 #include "gtest/internal/gtest-internal.h"
@@ -292,10 +293,9 @@ internal::ParamGenerator<T> Range(T start, T end) {
 //
 template <typename ForwardIterator>
 internal::ParamGenerator<
-  typename ::testing::internal::IteratorTraits<ForwardIterator>::value_type>
+    typename std::iterator_traits<ForwardIterator>::value_type>
 ValuesIn(ForwardIterator begin, ForwardIterator end) {
-  typedef typename ::testing::internal::IteratorTraits<ForwardIterator>
-      ::value_type ParamType;
+  typedef typename std::iterator_traits<ForwardIterator>::value_type ParamType;
   return internal::ParamGenerator<ParamType>(
       new internal::ValuesInIteratorRangeGenerator<ParamType>(begin, end));
 }
diff --git a/googletest/include/gtest/internal/gtest-port.h b/googletest/include/gtest/internal/gtest-port.h
index 4f887c5e..8296a857 100644
--- a/googletest/include/gtest/internal/gtest-port.h
+++ b/googletest/include/gtest/internal/gtest-port.h
@@ -202,11 +202,6 @@
 //   Mutex, MutexLock, ThreadLocal, GetThreadCount()
 //                            - synchronization primitives.
 //
-// Template meta programming:
-//   IteratorTraits - partial implementation of std::iterator_traits, which
-//                    is not available in libCstd when compiled with Sun C++.
-//
-//
 // Regular expressions:
 //   RE             - a simple regular expression class using the POSIX
 //                    Extended Regular Expression syntax on UNIX-like platforms
@@ -1937,22 +1932,6 @@ struct is_same : public false_type {};
 template <typename T>
 struct is_same<T, T> : public true_type {};
 
-template <typename Iterator>
-struct IteratorTraits {
-  typedef typename Iterator::value_type value_type;
-};
-
-
-template <typename T>
-struct IteratorTraits<T*> {
-  typedef T value_type;
-};
-
-template <typename T>
-struct IteratorTraits<const T*> {
-  typedef T value_type;
-};
-
 #if GTEST_OS_WINDOWS
 # define GTEST_PATH_SEP_ "\\"
 # define GTEST_HAS_ALT_PATH_SEP_ 1
diff --git a/googletest/test/googletest-port-test.cc b/googletest/test/googletest-port-test.cc
index 42035cc9..60d637c3 100644
--- a/googletest/test/googletest-port-test.cc
+++ b/googletest/test/googletest-port-test.cc
@@ -201,24 +201,6 @@ TEST(ImplicitCastTest, CanUseImplicitConstructor) {
   EXPECT_TRUE(converted);
 }
 
-TEST(IteratorTraitsTest, WorksForSTLContainerIterators) {
-  StaticAssertTypeEq<int,
-      IteratorTraits< ::std::vector<int>::const_iterator>::value_type>();
-  StaticAssertTypeEq<bool,
-      IteratorTraits< ::std::list<bool>::iterator>::value_type>();
-}
-
-TEST(IteratorTraitsTest, WorksForPointerToNonConst) {
-  StaticAssertTypeEq<char, IteratorTraits<char*>::value_type>();
-  StaticAssertTypeEq<const void*, IteratorTraits<const void**>::value_type>();
-}
-
-TEST(IteratorTraitsTest, WorksForPointerToConst) {
-  StaticAssertTypeEq<char, IteratorTraits<const char*>::value_type>();
-  StaticAssertTypeEq<const void*,
-      IteratorTraits<const void* const*>::value_type>();
-}
-
 TEST(GtestCheckSyntaxTest, BehavesLikeASingleStatement) {
   if (AlwaysFalse())
     GTEST_CHECK_(false) << "This should never be executed; "