1 files changed, 84 insertions, 0 deletions
diff --git a/ACE/ace/Truncate.h b/ACE/ace/Truncate.h
new file mode 100644
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--- /dev/null
+++ b/ACE/ace/Truncate.h
@@ -0,0 +1,84 @@
+// -*- C++ -*-
+//=============================================================================
+/**
+ * @file Truncate.h
+ *
+ * $Id$
+ *
+ * @author Steve Huston <shuston@riverace.com>
+ */
+//=============================================================================
+#ifndef ACE_TRUNCATE_H
+#define ACE_TRUNCATE_H
+#include /**/ "ace/pre.h"
+
+#include "ace/config-all.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+# pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+#include "ace/Global_Macros.h"
+
+#if !defined(ACE_LACKS_NUMERIC_LIMITS)
+// some platforms pollute the namespace by defining max() and min() macros
+#  ifdef max
+#    undef max
+#  endif
+#  ifdef min
+#    undef min
+#  endif
+#  include <limits>
+#else
+#  include "ace/os_include/os_limits.h"
+#endif /* ACE_LACKS_NUMERIC_LIMITS */
+
+ACE_BEGIN_VERSIONED_NAMESPACE_DECL
+
+namespace ACE_Utils
+{
+/**
+ * @class Truncate
+ *
+ * @brief Helper function to truncate an integral value to an int.
+ *
+ *        Very useful since ACE methods return int very often and the value's
+ *        source is often a different-size integral type, such as size_t.
+ *        This function hides the truncation logic and resolves compiler
+ *        diagnostics.
+ *
+ * @internal Internal use only.
+ */
+template<typename X>
+inline int Truncate (const X& val)
+{
+#if !defined (ACE_LACKS_NUMERIC_LIMITS)
+  if (val > static_cast<X> (std::numeric_limits<int>::max ()))
+    return std::numeric_limits<int>::max ();
+#else
+  if (val > static_cast<X> (INT_MAX))
+    return INT_MAX;
+#endif /* ACE_LACKS_NUMERIC_LIMITS */
+  return static_cast<int> (val);
+}
+
+// Specialize one for size_t to alleviate the explicit instantiation pain.
+template<>
+inline int Truncate<size_t> (const size_t& val)
+{
+#if !defined (ACE_LACKS_NUMERIC_LIMITS)
+  if (val > static_cast<size_t> (std::numeric_limits<int>::max ()))
+    return std::numeric_limits<int>::max ();
+#else
+  if (val > static_cast<size_t> (INT_MAX))
+    return INT_MAX;
+#endif /* ACE_LACKS_NUMERIC_LIMITS */
+  return static_cast<int> (val);
+}
+
+} // namespace ACE_Utils
+
+ACE_END_VERSIONED_NAMESPACE_DECL
+
+#include /**/ "ace/post.h"
+#endif /* ACE_TRUNCATE_H*/