From 8e761289a2446367267c6c0d9a26e734f0f78306 Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Wed, 16 Dec 2020 20:29:05 +0300
Subject: Get rid of legacy build systems and rename cutl/ to libcutl/

---
 libcutl/shared-ptr/base.cxx | 61 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 libcutl/shared-ptr/base.cxx

(limited to 'libcutl/shared-ptr/base.cxx')

diff --git a/libcutl/shared-ptr/base.cxx b/libcutl/shared-ptr/base.cxx
new file mode 100644
index 0000000..a3bc774
--- /dev/null
+++ b/libcutl/shared-ptr/base.cxx
@@ -0,0 +1,61 @@
+// file      : libcutl/shared-ptr/base.cxx
+// license   : MIT; see accompanying LICENSE file
+
+#include <libcutl/shared-ptr/base.hxx>
+
+using std::size_t;
+
+//
+//
+cutl::share shared = cutl::share (1);
+cutl::share exclusive = cutl::share (2);
+
+//
+//
+namespace cutl
+{
+  char const* not_shared::
+  what () const noexcept
+  {
+    return "object is not shared";
+  }
+}
+
+//
+//
+void*
+operator new (size_t n, cutl::share s)
+{
+  if (s == shared)
+  {
+    // Here we need to make sure we don't break the alignment of the
+    // returned block. For that we need to know the maximum alignment
+    // of this platform. Twice the pointer size is a good guess for
+    // most platforms.
+    //
+    size_t* p = static_cast<size_t*> (operator new (n + 2 * sizeof (size_t)));
+    *p++ = 1;          // Initial count.
+    *p++ = 0xDEADBEEF; // Signature.
+    return p;
+  }
+  else
+    return operator new (n);
+
+}
+
+void
+operator delete (void* p, cutl::share s) noexcept
+{
+  // This version of operator delete is only called when the c-tor
+  // fails. In this case there is no object and we can just free the
+  // memory.
+  //
+  if (s == shared)
+  {
+    size_t* sp = static_cast<size_t*> (p);
+    sp -= 2;
+    operator delete (sp);
+  }
+  else
+    operator delete (p);
+}
-- 
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