cmstd: Modernize CMake system headers

Provide a standardized way to handle the C++ "standard" headers
customized to be used with current CMake C++ standard constraints.
Offer under directory `cm` headers which can be used as direct
replacements of the standard ones.  For example:

    #include <cm/string_view>

can be used safely for CMake development in place of the `<string_view>`
standard header.

Fixes: #19491

1 files changed, 3 insertions, 3 deletions

diff --git a/Source/cmStateSnapshot.cxx b/Source/cmStateSnapshot.cxx
index 28d5170..645907c 100644
--- a/Source/cmStateSnapshot.cxx
+++ b/Source/cmStateSnapshot.cxx
@@ -5,10 +5,10 @@
 
 #include <algorithm>
 #include <cassert>
-#include <iterator>
 #include <string>
 
-#include "cmAlgorithms.h"
+#include <cm/iterator>
+
 #include "cmDefinitions.h"
 #include "cmListFileCache.h"
 #include "cmPropertyMap.h"
@@ -279,7 +279,7 @@ void InitializeContentFromParent(T& parentContent, T& thisContent,
   auto parentBegin = parentContent.begin();
   auto parentEnd = parentContent.end();
 
-  auto parentRbegin = cmMakeReverseIterator(parentEnd);
+  auto parentRbegin = cm::make_reverse_iterator(parentEnd);
   auto parentRend = parentContent.rend();
   parentRbegin = std::find(parentRbegin, parentRend, cmPropertySentinal);
   auto parentIt = parentRbegin.base();