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unitree_SDK/include/dds/ddsrt/static_assert.h

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+/*
+ * Copyright(c) 2019 ZettaScale Technology and others
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0, or the Eclipse Distribution License
+ * v. 1.0 which is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+ */
+#ifndef DDSRT_STATIC_ASSERT_H
+#define DDSRT_STATIC_ASSERT_H
+
+/* There are many tricks to use a constant expression to yield an
+   illegal type or expression at compile time, such as zero-sized
+   arrays and duplicate case or enum labels. So this is but one of the
+   many tricks. */
+
+#define DDSRT_STATIC_ASSERT2(line, pred)        \
+  struct static_assert_##line {                 \
+    char cond[(pred) ? 1 : -1];                 \
+  }
+#define DDSRT_STATIC_ASSERT1(line, pred)        \
+  DDSRT_STATIC_ASSERT2 (line, pred)
+#define DDSRT_STATIC_ASSERT(pred)               \
+  DDSRT_STATIC_ASSERT1 (__LINE__, pred)
+
+#ifndef _MSC_VER
+#define DDSRT_STATIC_ASSERT_CODE(pred) do { switch(0) { case 0: case (pred): ; } } while (0)
+#else
+/* Temporarily disabling warning C6326: Potential comparison of a
+   constant with another constant. */
+#define DDSRT_STATIC_ASSERT_CODE(pred) do {     \
+    __pragma (warning (push))                   \
+      __pragma (warning (disable : 6326))       \
+      switch(0) { case 0: case (pred): ; }      \
+    __pragma (warning (pop))                    \
+  } while (0)
+#endif
+
+#endif