diff -r d2122a32ec86 -r be9ba3531afb main.hh
--- a/main.hh	Wed Jul 18 17:10:57 2012 +0100
+++ b/main.hh	Wed Jul 18 22:34:51 2012 +0100
@@ -35,33 +35,6 @@
 #define _MAIN_HH
 
 
- /* Get the definition of INT16_MAX, INT16_MIN, UINT64_MAX, INT64_MAX, INT64_MIN, ... */
-
-#define __STDC_LIMIT_MACROS /* required when including from C++ source code. */
-#include <stdint.h>         
-
-#ifndef   UINT64_MAX 
-  #define UINT64_MAX (std::numeric_limits< uint64_t >::max())
-#endif
-#ifndef    INT64_MAX 
-  #define  INT64_MAX (std::numeric_limits<  int64_t >::max())
-#endif
-#ifndef    INT64_MIN
-  #define  INT64_MIN (std::numeric_limits<  int64_t >::min()) 
-#endif
-
-#if    (real64_t  == float)
-  #define HUGE_VAL64  HUGE_VALF
-#elif  (real64_t  == double)
-  #define HUGE_VAL64  HUGE_VAL
-#elif  (real64_t  == long_double)
-  #define HUGE_VAL64  HUGE_VALL
-#else 
-  #error Could not determine which data type is being used for real64_t (defined in absyntax.hh). Aborting!
-#endif
-
-
-
 
  /* Function used throughout the code --> used to report failed assertions (i.e. internal compiler errors)! */
 #include <stddef.h>  /* required for NULL */
@@ -75,4 +48,80 @@
 
 
 
+
+
+ /* Get the definition of INT16_MAX, INT16_MIN, UINT64_MAX, INT64_MAX, INT64_MIN, ... */
+
+#define __STDC_LIMIT_MACROS /* required to have UINTxx_MAX defined when including stdint.h from C++ source code. */
+#include <stdint.h>         
+#include <limits>
+
+#ifndef   UINT64_MAX 
+  #define UINT64_MAX (std::numeric_limits< uint64_t >::max())
+#endif
+#ifndef    INT64_MAX 
+  #define  INT64_MAX (std::numeric_limits<  int64_t >::max())
+#endif
+#ifndef    INT64_MIN
+  #define  INT64_MIN (std::numeric_limits<  int64_t >::min()) 
+#endif
+
+
+
+/* Determine, for the current platform, which datas types (float, double or long double) use 64 and 32 bits. */
+/* NOTE: We cant use sizeof() in pre-processor directives, so we have to do it another way... */
+/* CURIOSITY: We can use sizeof() and offsetof() inside static_assert() but:
+ *          - this only allows us to make assertions, and not #define new macros
+ *          - is only available in the C standard [ISO/IEC 9899:2011] and the C++ 0X draft standard [Becker 2008]. It is not available in C99.
+ *          https://www.securecoding.cert.org/confluence/display/seccode/DCL03-C.+Use+a+static+assertion+to+test+the+value+of+a+constant+expression
+ *         struct {int a, b, c, d} header_t;
+ *  e.g.:  static_assert(offsetof(struct header_t, c) == 8, "Compile time error message.");
+ */
+
+#include <float.h>
+#if    (LDBL_MANT_DIG == 53) /* NOTE: 64 bit IEC559 real has 53 bits for mantissa! */
+  #define long_double long double
+  #define real64_t long_double /* so we can later use #if (real64_t == long_double) directives in the code! */
+  #define REAL64_MAX  LDBL_MAX
+#elif  ( DBL_MANT_DIG == 53) /* NOTE: 64 bit IEC559 real has 53 bits for mantissa! */
+  #define real64_t double
+  #define REAL64_MAX  DBL_MAX
+#elif  ( FLT_MANT_DIG == 53) /* NOTE: 64 bit IEC559 real has 53 bits for mantissa! */
+  #define real64_t float
+  #define REAL64_MAX  FLT_MAX
+#else 
+  #error Could not find a 64 bit floating point data type on this platform. Aborting...
+#endif
+
+
+#if    (LDBL_MANT_DIG == 24) /* NOTE: 32 bit IEC559 real has 24 bits for mantissa! */
+  #ifndef long_double 
+    #define long_double long double
+  #endif  
+  #define real32_t long_double /* so we can later use #if (real32_t == long_double) directives in the code! */
+  #define REAL32_MAX  LDBL_MAX
+#elif  ( DBL_MANT_DIG == 24) /* NOTE: 32 bit IEC559 real has 24 bits for mantissa! */
+  #define real32_t double
+  #define REAL32_MAX  DBL_MAX
+#elif  ( FLT_MANT_DIG == 24) /* NOTE: 32 bit IEC559 real has 24 bits for mantissa! */
+  #define real32_t float
+  #define REAL32_MAX  FLT_MAX
+#else 
+  #error Could not find a 32 bit floating point data type on this platform. Aborting...
+#endif
+
+
+
+#include <math.h>
+#ifndef INFINITY
+  #error Could not find the macro that defines the value for INFINITY in the current platform.
+#endif
+#ifndef NAN
+  #error Could not find the macro that defines the value for NAN in the current platform.
+#endif
+
+
+
+
+
 #endif // #ifndef _MAIN_HH
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