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, 48 deletions

diff --git a/Source/cm_thread.hxx b/Source/cm_thread.hxx
deleted file mode 100644
index b1f0645..0000000
--- a/Source/cm_thread.hxx
+++ /dev/null
@@ -1,48 +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_THREAD_HXX
-#define CM_THREAD_HXX
-
-#include "cmConfigure.h" // IWYU pragma: keep
-#include "cm_uv.h"
-
-namespace cm {
-
-class shared_mutex
-{
-  uv_rwlock_t _M_;
-
-public:
-  shared_mutex() { uv_rwlock_init(&_M_); }
-  ~shared_mutex() { uv_rwlock_destroy(&_M_); }
-
-  shared_mutex(shared_mutex const&) = delete;
-  shared_mutex& operator=(shared_mutex const&) = delete;
-
-  void lock() { uv_rwlock_wrlock(&_M_); }
-  void unlock() { uv_rwlock_wrunlock(&_M_); }
-
-  void lock_shared() { uv_rwlock_rdlock(&_M_); }
-  void unlock_shared() { uv_rwlock_rdunlock(&_M_); }
-};
-
-template <typename T>
-class shared_lock
-{
-  T& _mutex;
-
-public:
-  shared_lock(T& m)
-    : _mutex(m)
-  {
-    _mutex.lock_shared();
-  }
-
-  ~shared_lock() { _mutex.unlock_shared(); }
-
-  shared_lock(shared_lock const&) = delete;
-  shared_lock& operator=(shared_lock const&) = delete;
-};
-}
-
-#endif