-#ifndef _BABELTRACE_INTERNAL_H
-#define _BABELTRACE_INTERNAL_H
-
/*
- * Copyright 2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
+ * SPDX-License-Identifier: MIT
*
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
+ * Copyright 2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*/
+#ifndef _BABELTRACE_INTERNAL_H
+#define _BABELTRACE_INTERNAL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
#define bt_max_t(type, a, b) \
((type) (a) > (type) (b) ? (type) (a) : (type) (b))
_ref; \
})
+/*
+ * Copied from:
+ * <https://stackoverflow.com/questions/37411809/how-to-elegantly-fix-this-unused-variable-warning/37412551#37412551>:
+ *
+ * * sizeof() ensures that the expression is not evaluated at all, so
+ * its side-effects don't happen. That is to be consistent with the
+ * usual behaviour of debug-only constructs, such as assert().
+ *
+ * * `((_expr), 0)` uses the comma operator to swallow the actual type
+ * of `(_expr)`. This is to prevent VLAs from triggering evaluation.
+ *
+ * * `(void)` explicitly ignores the result of `(_expr)` and sizeof() so
+ * no "unused value" warning appears.
+ */
+
+#define BT_USE_EXPR(_expr) ((void) sizeof((void) (_expr), 0))
+#define BT_USE_EXPR2(_expr1, _expr2) \
+ ((void) sizeof((void) (_expr1), (void) (_expr2), 0))
+#define BT_USE_EXPR3(_expr1, _expr2, _expr3) \
+ ((void) sizeof((void) (_expr1), (void) (_expr2), (void) (_expr3), 0))
+#define BT_USE_EXPR4(_expr1, _expr2, _expr3, _expr4) \
+ ((void) sizeof((void) (_expr1), (void) (_expr2), \
+ (void) (_expr3), (void) (_expr4), 0))
+#define BT_USE_EXPR5(_expr1, _expr2, _expr3, _expr4, _expr5) \
+ ((void) sizeof((void) (_expr1), (void) (_expr2), \
+ (void) (_expr3), (void) (_expr4), (void) (_expr5), 0))
+
+#ifdef __cplusplus
+}
+#endif
+
#endif