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-rw-r--r--src/base/compiler.hh30
1 files changed, 30 insertions, 0 deletions
diff --git a/src/base/compiler.hh b/src/base/compiler.hh
index a95cb791c..7b1c53d87 100644
--- a/src/base/compiler.hh
+++ b/src/base/compiler.hh
@@ -31,6 +31,8 @@
#ifndef __BASE_COMPILER_HH__
#define __BASE_COMPILER_HH__
+#include "config/have_static_assert.hh"
+
//http://msdn2.microsoft.com/en-us/library/ms937669.aspx
//http://msdn2.microsoft.com/en-us/library/aa448724.aspx
//http://docs.sun.com/source/819-3688/sun.specific.html#marker-998278
@@ -56,4 +58,32 @@
#error "Need to define compiler options in base/compiler.hh"
#endif
+/*
+ * Define a compatibility macro that emulates the behavior of
+ * static_assert using template magic if the compiler doesn't have
+ * native support.
+ */
+#if !HAVE_STATIC_ASSERT
+
+template<bool>
+struct static_assert_failure;
+
+template<>
+struct static_assert_failure<false> {};
+
+/* The following macro causes the compiler to evaluate the size of the
+ * static_assert_failure struct. The templates are designed so that
+ * only static_assert_failure<false> evaluates to a proper size, while
+ * static_assert_failure<true> generates a compile time error.
+ */
+#define static_assert(expr, msg) \
+ namespace ns_static_assert { \
+ enum { \
+ static_assert_ ## __LINE__ = \
+ sizeof(static_assert_failure<!(expr)>) \
+ }; \
+ }
+
+#endif
+
#endif // __BASE_COMPILER_HH__