1 files changed, 24 insertions, 0 deletions
diff --git a/Source/cmDuration.h b/Source/cmDuration.h
new file mode 100644
index 000000000..6df1455b4
--- /dev/null
+++ b/Source/cmDuration.h
@@ -0,0 +1,24 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#pragma once
+
+#include <chrono>
+#include <ratio>
+
+typedef std::chrono::duration<double, std::ratio<1>> cmDuration;
+
+/*
+ * This function will return number of seconds in the requested type T.
+ *
+ * A duration_cast from duration<double> to duration<T> will not yield what
+ * one might expect if the double representation does not fit into type T.
+ * This function aims to safely convert, by clamping the double value between
+ * the permissible valid values for T.
+ */
+template <typename T>
+T cmDurationTo(const cmDuration& duration);
+
+#ifndef CMDURATION_CPP
+extern template int cmDurationTo<int>(const cmDuration&);
+extern template unsigned int cmDurationTo<unsigned int>(const cmDuration&);
+#endif