Changeset 106035 in vbox for trunk/include/iprt

Timestamp:

Sep 12, 2024 1:38:42 PM (8 months ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

164784

Message:

iprt/cdefs.h: Wrapper for some uses of constexpr (only needed in code that isn't explictly c++17 or later). bugref:10720

File:

• trunk/include/iprt/cdefs.h (modified) (3 diffs)

trunk/include/iprt/cdefs.h

@@ -1392 +1392 @@
 /** @def RT_NOEXCEPT
  * Wrapper for the C++11 noexcept keyword (only true form).
- * @note use RT_NOTHROW instead.
  */
 /** @def RT_NOEXCEPT_EX
@@ -1463 +1462 @@
  * The typical cache line size for the target architecture.
  * @see RT_ALIGNAS_VAR, RT_ALIGNAS_TYPE, RT_ALIGNAS_MEMB
+ * @todo This is not correct for M1,M2,M3,M4,++, they have 128 byte cache lines.
  */
 #if  defined(RT_ARCH_X86)     || defined(RT_ARCH_AMD64) \
@@ -1472 +1472 @@
 # define RT_CACHELINE_SIZE  128     /* better overdo it */
 #endif
+
+
+/** @def RT_CONSTEXPR
+ * Wrapper for the C++11 constexpr keyword for use as per C++11.
+ */
+#if RT_CPLUSPLUS_PREREQ(201100)
+# define RT_CONSTEXPR                   constexpr
+#else
+# define RT_CONSTEXPR
+#endif
+
+/** @def RT_CONSTEXPR_IF
+ * Wrapper for the C++17 use of constexpr in combination with if statements.
+ */
+#if RT_CPLUSPLUS_PREREQ(201700)
+# define RT_CONSTEXPR_IF(a_CondExpr)    constexpr(a_CondExpr)
+#else
+# define RT_CONSTEXPR_IF(a_CondExpr)    (a_CondExpr)
+#endif
+
 
 /** @def RT_FALL_THROUGH