[beast] BIRNET: use startup assertions for float checks, courtesy stw

[Tim Janik <timj src gnome org>]

commit 2006848c0aa5dd8843d2149a24bcb6a5c40c228c
Author: Tim Janik <timj gnu org>
Date:   Fri Apr 6 04:11:23 2012 +0200

    BIRNET: use startup assertions for float checks, courtesy stw

 birnet/birnetcdefs.h  |    2 ++
 birnet/birnetutils.cc |    6 +++---
 2 files changed, 5 insertions(+), 3 deletions(-)
---
diff --git a/birnet/birnetcdefs.h b/birnet/birnetcdefs.h
index 0cb882c..45e55ba 100644
--- a/birnet/birnetcdefs.h
+++ b/birnet/birnetcdefs.h
@@ -111,6 +111,8 @@ BIRNET_EXTERN_C_BEGIN();
 #define BIRNET_CPP_PASTE2(a,b)                  BIRNET_CPP_PASTE2i (a,b)
 #define BIRNET_STATIC_ASSERT_NAMED(expr,asname) typedef struct { char asname[(expr) ? 1 : -1]; } BIRNET_CPP_PASTE2 (Birnet_StaticAssertion_LINE, __LINE__)
 #define BIRNET_STATIC_ASSERT(expr)              BIRNET_STATIC_ASSERT_NAMED (expr, compile_time_assertion_failed)
+#define BIRNET_STARTUP_ASSERTi(e, _N)           namespace { static struct _N { inline _N() { BIRNET_ASSERT (e); } } _N; }
+#define BIRNET_STARTUP_ASSERT(expr)             BIRNET_STARTUP_ASSERTi (expr, BIRNET_CPP_PASTE2 (StartupAssertion, __LINE__))
 
 /* --- attributes --- */
 #if     __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 3)
diff --git a/birnet/birnetutils.cc b/birnet/birnetutils.cc
index 529b336..db76031 100644
--- a/birnet/birnetutils.cc
+++ b/birnet/birnetutils.cc
@@ -250,9 +250,9 @@ BIRNET_STATIC_ASSERT (UINT64_MAX   == +18446744073709551615LLU);
 BIRNET_STATIC_ASSERT (FLT_MIN      <= 1E-37);
 BIRNET_STATIC_ASSERT (FLT_MAX      >= 1E+37);
 BIRNET_STATIC_ASSERT (FLT_EPSILON  <= 1E-5);
-BIRNET_STATIC_ASSERT (DBL_MIN      <= 1E-37);
-BIRNET_STATIC_ASSERT (DBL_MAX      >= 1E+37);
-BIRNET_STATIC_ASSERT (DBL_EPSILON  <= 1E-9);
+BIRNET_STARTUP_ASSERT (DBL_MIN      <= 1E-37);
+BIRNET_STARTUP_ASSERT (DBL_MAX      >= 1E+37);
+BIRNET_STARTUP_ASSERT (DBL_EPSILON  <= 1E-9);
 BIRNET_STATIC_ASSERT (LDBL_MIN     <= 1E-37);
 BIRNET_STATIC_ASSERT (LDBL_MAX     >= 1E+37);
 BIRNET_STATIC_ASSERT (LDBL_EPSILON <= 1E-9);