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, 0 insertions, 31 deletions

diff --git a/Source/cm_memory.hxx b/Source/cm_memory.hxx
deleted file mode 100644
index 9f5e678..0000000
--- a/Source/cm_memory.hxx
+++ /dev/null
@@ -1,31 +0,0 @@
-/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
-   file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cm_memory_hxx
-#define cm_memory_hxx
-
-#include "cmConfigure.h" // IWYU pragma: keep
-
-#include <memory> // IWYU pragma: export
-#if !defined(CMake_HAVE_CXX_MAKE_UNIQUE)
-#  include <utility>
-#endif
-
-namespace cm {
-
-#if defined(CMake_HAVE_CXX_MAKE_UNIQUE)
-
-using std::make_unique;
-
-#else
-
-template <typename T, typename... Args>
-std::unique_ptr<T> make_unique(Args&&... args)
-{
-  return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
-}
-
-#endif
-
-} // namespace cm
-
-#endif