debug: add CHECK_FINITE assertion

debug.hpp

@@ -18,6 +18,7 @@
 #define __DEBUG_HPP
 
 //#include "maths.hpp" // XXX: See notes at the end of file for maths.hpp inclusion
+#include <cmath>
 #include <algorithm>
 #include <stdexcept>
 #include <string>
@@ -288,6 +289,21 @@
 #endif
 
 
+#if !defined(NDEBUG)
+    #define CHECK_FINITE(V) do {                    \
+        const auto &__v = (V);                      \
+        if (!std::isfinite (__v)) {                 \
+            _CHECK_PANIC ("expected finite value\n" \
+                          "__v: %! is %!",          \
+                          #V, __v);                 \
+        }                                           \
+    } while (0)
+#else
+#define CHECK_FINITE(V,...)
+#endif
+
+
+
 
 ///////////////////////////////////////////////////////////////////////////////
 #define CHECK_THROWS(E,C) do {                              \