[ruby-list:3375] Exception

けいじゅ＠今はフリー(^^;;です.

例外についてちょっと伺いたいことがあります.

現在の例外は, 発行された例外の(例外)クラスによって, 実際の例外を識別で
きるようになっていませんよね? 例えば, TypeErrorには:

bignum.c:1183:  TypeError("can't coerce %s to Bignum", rb_class2name(CLASS_OF(y)));
class.c:283:    TypeError("cannot define singleton");
error.c:171:    TypeError("wrong argument type %s (expected %s)",
eval.c:502:	TypeError("wrong argument type %s (expected String)",
eval.c:890:     TypeError("undefined superclass `%s'", rb_id2name(node->nd_mid));
eval.c:893:     TypeError("undefined superclass `%s'", rb_id2name(node->nd_vid));
eval.c:895:     TypeError("superclass undefined");
eval.c:1003:	TypeError("trace_func needs to be Proc");
eval.c:1745:    TypeError("Can't define method \"%s\" for Fixnum",
eval.c:1749:    TypeError("Can't define method \"%s\" for nil",
eval.c:1753:    TypeError("Can't define method \"%s\" for special constants",
eval.c:1809:    TypeError("%s is not a class", rb_id2name(node->nd_cname));
eval.c:1819:    TypeError("superclass mismatch for %s",
eval.c:1847:    TypeError("%s is not a module", rb_id2name(node->nd_cname));
eval.c:1870:    TypeError("No virtual class for Fixnums");
eval.c:1873:    TypeError("No virtual class for nil");
eval.c:1876:    TypeError("No virtual class for special constants");
eval.c:2538:    TypeError("class or module required for rescue clause");
eval.c:3209:    TypeError("wrong argument type %s (expected Proc/Binding)",
eval.c:4214:	TypeError("wrong argument type %s (expected Thread)",
io.c:786:       if (f == 0) TypeError("non-writable fptr");
io.c:1181:	TypeError("$< must have write method, %s given",
io.c:1425:	TypeError("value of %s must be String", rb_id2name(id));
numeric.c:51:	TypeError("coerce must return [x, y]");
numeric.c:75:	TypeError("coerce must return [x, y]");
numeric.c:434:  TypeError("failed to convert %s into Integer",
object.c:94:	TypeError("can't clone %s", rb_class2name(CLASS_OF(obj)));
object.c:207:	TypeError("class or module required");
object.c:241:	TypeError("class or module required");
object.c:299:	TypeError("tried to add %s(%s) to nil",
object.c:486:   TypeError("failed to convert %s into Float", rb_class2name(CLASS_OF(val)));
string.c:285:	TypeError("can't modify frozen string");
string.c:482:	TypeError("type mismatch");
string.c:543:	TypeError("Type mismatch: %s given", rb_class2name(CLASS_OF(sub)));
time.c:129:     TypeError("Can't convert %s into Time",
variable.c:605:	TypeError("class %s can not have instance variables",
variable.c:631:	TypeError("class %s can not have instance variables",

こんなにたくさんあります.

これでは, 実際の例外を識別するのに文字列で区別しなくてはなりません.

例外クラスの目的は, 例外の識別にあると思っていたのですが... そういうも
のではないんですか?

__
.........................................石塚 圭樹＠今はフリー(^^;;...
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