# define SOD__ALIGNOF(type) __alignof__(type)
#else
# define SOD__ALIGNOF(type) \
-offsetof(struct { char sod__x; type sod__y; }, sod__y)
+ offsetof(struct { char sod__x; type sod__y; }, sod__y)
#endif
/* --- @SOD__IGNORE@ --- *
#define SOD__IGNORE(var) ((void)(var))
+/* --- @SOD__NORETURN@ --- *
+ *
+ * Use: Marks functions which are not expected to return.
+ */
+
+#if SOD__GCC_P(2, 5)
+# define SOD__NORETURN __attribute__((__noreturn__))
+#endif
+
+#ifndef SOD__NORETURN
+# define SOD__NORETURN
+#endif
+
+/* --- @SOD__PARANOIA@ --- *
+ *
+ * Arguments: @cond@ = a condition to check
+ * @conseq@ = a thing to evaluate to if the check passes
+ * @alt@ = a thing to do if the check fails
+ *
+ * Use: Check to make sure something is good at runtime, unless
+ * disabled.
+ */
+
+#if SOD_RECKLESS
+# define SOD__PARANOIA(cond, conseq, alt) (conseq)
+#else
+# define SOD__PARANOIA(cond, conseq, alt) ((cond) ? (conseq) : (alt))
+#endif
+
/* --- @SOD__CAR@ --- *
*
* Arguments: @...@ = a nonempty list of arguments
/* --- @SOD_DECL@ --- *
*
- * Arguments: @cls@ = a class type name
+ * Arguments: @cls_@ = a class type name
* @var@ = a variable name
* @keys@ = a @KWARGS(...)@ keyword argument sequence
*
* @cls@ with automatic lifetime.
*/
-#define SOD_DECL(cls, var, keys) \
- struct cls##__ilayout var##__layout; \
- cls *var = (cls *)sod_init(cls##__class, &var##__layout, keys)
+#define SOD_DECL(cls_, var, keys) \
+ struct cls_##__ilayout var##__layout; \
+ cls_ *var = \
+ SOD__PARANOIA(sizeof(var##__layout) == cls_##__class->cls.initsz, \
+ (cls_ *)sod_init(cls_##__class, &var##__layout, keys), \
+ (sod__chksz_fail(cls_##__class, sizeof(var##__layout)), \
+ (cls_ *)0))
/*----- Functions provided ------------------------------------------------*/
+/* --- @sod__chksz_fail@ --- *
+ *
+ * Arguments: @const SodClass *cls@ = class we were trying to instantiate
+ * @size_t sz@ = size allocated
+ *
+ * Returns: Doesn't.
+ *
+ * Use: Reports instantiation failure caused by a mismatch between
+ * the size allocated (@sz@) and the size required for an
+ * instance of class @cls@.
+ */
+
+extern SOD__NORETURN
+ void sod__chksz_fail(const SodClass */*cls*/, size_t /*sz*/);
+
/* --- @sod_subclassp@ --- *
*
* Arguments: @const SodClass *sub, *super@ = pointers to two classes