[dpdk-dev] [RFC 10/35] eal: introduce RTE_DECONST macro

[Olivier Matz]

This macro removes the const attribute of a variable. It must be used
with care in specific situations. It's better to use this macro instead
of a manual cast, as it explicitly shows the intention of the developer.

This macro is used in the next commit of the series.

Signed-off-by: Olivier Matz <olivier.matz at 6wind.com>
---
 lib/librte_eal/common/include/rte_common.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h
index 332f2a4..dc0fc83 100644
--- a/lib/librte_eal/common/include/rte_common.h
+++ b/lib/librte_eal/common/include/rte_common.h
@@ -285,6 +285,15 @@ rte_align64pow2(uint64_t v)
 
 /*********** Other general functions / macros ********/
 
+/**
+ * Remove the const attribute of a variable
+ *
+ * This must be used with care in specific situations. It's better to
+ * use this macro instead of a manual cast, as it explicitly shows the
+ * intention of the developer.
+ */
+#define RTE_DECONST(type, var) ((type)(uintptr_t)(const void *)(var))
+
 #ifdef __SSE2__
 #include <emmintrin.h>
 /**
-- 
2.1.4