Pluggable Struct

1 files changed, 0 insertions, 781 deletions

diff --git a/src/struct.c b/src/struct.c
deleted file mode 100644
index d7b63259e..000000000
--- a/src/struct.c
+++ /dev/null
@@ -1,781 +0,0 @@
-/*
-** struct.c - Struct class
-**
-** See Copyright Notice in mruby.h
-*/
-
-#include "mruby.h"
-#ifdef ENABLE_STRUCT
-#include <string.h>
-#include "error.h"
-#include "mruby/struct.h"
-#include "mruby/array.h"
-#include <stdarg.h>
-
-#include "mruby/string.h"
-#include "mruby/class.h"
-#include "mruby/variable.h"
-
-
-static struct RClass *
-struct_class(mrb_state *mrb)
-{
-  return mrb_class_get(mrb, "Struct");
-}
-
-static inline mrb_value
-struct_ivar_get(mrb_state *mrb, mrb_value c, mrb_sym id)
-{
-  struct RClass* kclass;
-  struct RClass* sclass = struct_class(mrb);
-
-  mrb_value ans;
-    for (;;) {
-      ans = mrb_iv_get(mrb, c, id);
-      if (!mrb_nil_p(ans)) return ans;
-      kclass = RCLASS_SUPER(c);
-      if (kclass == 0 || kclass == sclass)
-          return mrb_nil_value();
-      c = mrb_obj_value(kclass);
-    }
-}
-
-mrb_value
-mrb_struct_iv_get(mrb_state *mrb, mrb_value c, const char *name)
-{
-    return struct_ivar_get(mrb, c, mrb_intern(mrb, name));
-}
-
-mrb_value
-mrb_struct_s_members(mrb_state *mrb, mrb_value klass)
-{
-    mrb_value members = struct_ivar_get(mrb, klass, mrb_intern(mrb, "__members__"));
-
-    if (mrb_nil_p(members)) {
-      mrb_raise(mrb, E_TYPE_ERROR, "uninitialized struct");
-    }
-    if (!mrb_array_p(members)) {
-      mrb_raise(mrb, E_TYPE_ERROR, "corrupted struct");
-    }
-    return members;
-}
-
-mrb_value
-mrb_struct_members(mrb_state *mrb, mrb_value s)
-{
-  mrb_value members = mrb_struct_s_members(mrb, mrb_obj_value(mrb_obj_class(mrb, s)));
-  if (mrb_type(s) == MRB_TT_STRUCT) {
-    if (RSTRUCT_LEN(s) != RARRAY_LEN(members)) {
-      mrb_raisef(mrb, E_TYPE_ERROR, "struct size differs (%ld required %ld given)",
-             RARRAY_LEN(members), RSTRUCT_LEN(s));
-    }
-  }
-  return members;
-}
-
-static mrb_value
-mrb_struct_s_members_m(mrb_state *mrb, mrb_value klass)
-{
-    mrb_value members, ary;
-    mrb_value *p, *pend;
-
-    members = mrb_struct_s_members(mrb, klass);
-    ary = mrb_ary_new_capa(mrb, RARRAY_LEN(members));
-    p = RARRAY_PTR(members); pend = p + RARRAY_LEN(members);
-    while (p < pend) {
-      mrb_ary_push(mrb, ary, *p);
-      p++;
-    }
-
-    return ary;
-}
-
-static inline void
-struct_copy(mrb_value *dst, const mrb_value *src, size_t size)
-{
-  size_t i;
-
-  for (i = 0; i < size; i++) {
-    dst[i] = src[i];
-  }
-}
-
-/* 15.2.18.4.6  */
-/*
- *  call-seq:
- *     struct.members    -> array
- *
- *  Returns an array of strings representing the names of the instance
- *  variables.
- *
- *     Customer = Struct.new(:name, :address, :zip)
- *     joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
- *     joe.members   #=> [:name, :address, :zip]
- */
-
-static mrb_value
-mrb_struct_members_m(mrb_state *mrb, mrb_value obj)
-{
-    return mrb_struct_s_members_m(mrb, mrb_obj_value(mrb_obj_class(mrb, obj)));
-}
-
-mrb_value
-mrb_struct_getmember(mrb_state *mrb, mrb_value obj, mrb_sym id)
-{
-    mrb_value members, slot, *ptr, *ptr_members;
-    long i, len;
-
-    ptr = RSTRUCT_PTR(obj);
-    members = mrb_struct_members(mrb, obj);
-    ptr_members = RARRAY_PTR(members);
-    slot = mrb_symbol_value(id);
-    len = RARRAY_LEN(members);
-    for (i=0; i<len; i++) {
-      if (mrb_obj_equal(mrb, ptr_members[i], slot)) {
-          return ptr[i];
-      }
-    }
-    mrb_name_error(mrb, id, "%s is not struct member", mrb_sym2name(mrb, id));
-    return mrb_nil_value();            /* not reached */
-}
-
-static mrb_value
-mrb_struct_ref(mrb_state *mrb, mrb_value obj)
-{
-    return mrb_struct_getmember(mrb, obj, mrb->ci->mid);
-}
-
-static mrb_value mrb_struct_ref0(mrb_state* mrb, mrb_value obj) {return RSTRUCT_PTR(obj)[0];}
-static mrb_value mrb_struct_ref1(mrb_state* mrb, mrb_value obj) {return RSTRUCT_PTR(obj)[1];}
-static mrb_value mrb_struct_ref2(mrb_state* mrb, mrb_value obj) {return RSTRUCT_PTR(obj)[2];}
-static mrb_value mrb_struct_ref3(mrb_state* mrb, mrb_value obj) {return RSTRUCT_PTR(obj)[3];}
-static mrb_value mrb_struct_ref4(mrb_state* mrb, mrb_value obj) {return RSTRUCT_PTR(obj)[4];}
-static mrb_value mrb_struct_ref5(mrb_state* mrb, mrb_value obj) {return RSTRUCT_PTR(obj)[5];}
-static mrb_value mrb_struct_ref6(mrb_state* mrb, mrb_value obj) {return RSTRUCT_PTR(obj)[6];}
-static mrb_value mrb_struct_ref7(mrb_state* mrb, mrb_value obj) {return RSTRUCT_PTR(obj)[7];}
-static mrb_value mrb_struct_ref8(mrb_state* mrb, mrb_value obj) {return RSTRUCT_PTR(obj)[8];}
-static mrb_value mrb_struct_ref9(mrb_state* mrb, mrb_value obj) {return RSTRUCT_PTR(obj)[9];}
-
-#define numberof(array) (int)(sizeof(array) / sizeof((array)[0]))
-#define N_REF_FUNC numberof(ref_func)
-
-static mrb_value (*const ref_func[])(mrb_state*, mrb_value) = {
-    mrb_struct_ref0,
-    mrb_struct_ref1,
-    mrb_struct_ref2,
-    mrb_struct_ref3,
-    mrb_struct_ref4,
-    mrb_struct_ref5,
-    mrb_struct_ref6,
-    mrb_struct_ref7,
-    mrb_struct_ref8,
-    mrb_struct_ref9,
-};
-
-mrb_sym
-mrb_id_attrset(mrb_state *mrb, mrb_sym id)
-{
-  const char *name;
-  char *buf;
-  int len;
-  mrb_sym mid;
-
-  name = mrb_sym2name_len(mrb, id, &len);
-  buf = (char *)mrb_malloc(mrb, len+2);
-  memcpy(buf, name, len);
-  buf[len] = '=';
-  buf[len+1] = '\0';
-
-  mid = mrb_intern2(mrb, buf, len+1);
-  mrb_free(mrb, buf);
-  return mid;
-}
-
-static mrb_value
-mrb_struct_set(mrb_state *mrb, mrb_value obj, mrb_value val)
-{
-  const char *name;
-  int i, len;
-  mrb_sym mid;
-  mrb_value members, slot, *ptr, *ptr_members;
-
-  /* get base id */
-  name = mrb_sym2name_len(mrb, mrb->ci->mid, &len);
-  mid = mrb_intern2(mrb, name, len-1); /* omit last "=" */
-
-  members = mrb_struct_members(mrb, obj);
-  ptr_members = RARRAY_PTR(members);
-  len = RARRAY_LEN(members);
-  ptr = RSTRUCT_PTR(obj);
-  for (i=0; i<len; i++) {
-    slot = ptr_members[i];
-    if (mrb_symbol(slot) == mid) {
-      return ptr[i] = val;
-    }
-  }
-
-  mrb_name_error(mrb, mid, "`%s' is not a struct member",
-		 mrb_sym2name(mrb, mid));
-  return mrb_nil_value();            /* not reached */
-}
-
-static mrb_value
-mrb_struct_set_m(mrb_state *mrb, mrb_value obj)
-{
-  mrb_value val;
-
-  mrb_get_args(mrb, "o", &val);
-  return mrb_struct_set(mrb, obj, val);
-}
-
-#define is_notop_id(id) (id)//((id)>tLAST_TOKEN)
-#define is_local_id(id) (is_notop_id(id))//&&((id)&ID_SCOPE_MASK)==ID_LOCAL)
-int
-mrb_is_local_id(mrb_sym id)
-{
-    return is_local_id(id);
-}
-
-#define is_const_id(id) (is_notop_id(id))//&&((id)&ID_SCOPE_MASK)==ID_CONST)
-int
-mrb_is_const_id(mrb_sym id)
-{
-    return is_const_id(id);
-}
-
-static mrb_value
-make_struct(mrb_state *mrb, mrb_value name, mrb_value members, struct RClass * klass)
-{
-    mrb_value nstr, *ptr_members;
-    mrb_sym id;
-    long i, len;
-    struct RClass *c;
-
-    if (mrb_nil_p(name)) {
-      c = mrb_class_new(mrb, klass);
-    }
-    else {
-      /* old style: should we warn? */
-      name = mrb_str_to_str(mrb, name);
-      id = mrb_to_id(mrb, name);
-      if (!mrb_is_const_id(id)) {
-          mrb_name_error(mrb, id, "identifier %s needs to be constant", mrb_string_value_ptr(mrb, name));
-      }
-      if (mrb_const_defined_at(mrb, klass, id)) {
-          mrb_warn("redefining constant Struct::%s", mrb_string_value_ptr(mrb, name));
-          //?rb_mod_remove_const(klass, mrb_sym2name(mrb, id));
-      }
-      c = mrb_define_class_under(mrb, klass, RSTRING_PTR(name), klass);
-    }
-    MRB_SET_INSTANCE_TT(c, MRB_TT_STRUCT);
-    nstr = mrb_obj_value(c);
-    mrb_iv_set(mrb, nstr, mrb_intern(mrb, "__members__"), members);
-
-    mrb_define_class_method(mrb, c, "new", mrb_instance_new, ARGS_ANY());
-    mrb_define_class_method(mrb, c, "[]", mrb_instance_new, ARGS_ANY());
-    mrb_define_class_method(mrb, c, "members", mrb_struct_s_members_m, ARGS_NONE());
-    //RSTRUCT(nstr)->basic.c->super = c->c;
-    ptr_members = RARRAY_PTR(members);
-    len = RARRAY_LEN(members);
-    for (i=0; i< len; i++) {
-      mrb_sym id = mrb_symbol(ptr_members[i]);
-      if (mrb_is_local_id(id) || mrb_is_const_id(id)) {
-          if (i < N_REF_FUNC) {
-            mrb_define_method_id(mrb, c, id, ref_func[i], ARGS_NONE());
-          }
-          else {
-            mrb_define_method_id(mrb, c, id, mrb_struct_ref, ARGS_NONE());
-          }
-          mrb_define_method_id(mrb, c, mrb_id_attrset(mrb, id), mrb_struct_set_m, ARGS_REQ(1));
-      }
-    }
-
-    return nstr;
-}
-
-mrb_value
-mrb_struct_define(mrb_state *mrb, const char *name, ...)
-{
-    va_list ar;
-    mrb_value nm, ary;
-    char *mem;
-
-    if (!name) nm = mrb_nil_value();
-    else nm = mrb_str_new2(mrb, name);
-    ary = mrb_ary_new(mrb);
-
-    va_start(ar, name);
-    while ((mem = va_arg(ar, char*)) != 0) {
-      mrb_sym slot = mrb_intern(mrb, mem);
-      mrb_ary_push(mrb, ary, mrb_symbol_value(slot));
-    }
-    va_end(ar);
-
-    return make_struct(mrb, nm, ary, struct_class(mrb));
-}
-
-/* 15.2.18.3.1  */
-/*
- *  call-seq:
- *     Struct.new( [aString] [, aSym]+> )    -> StructClass
- *     StructClass.new(arg, ...)             -> obj
- *     StructClass[arg, ...]                 -> obj
- *
- *  Creates a new class, named by <i>aString</i>, containing accessor
- *  methods for the given symbols. If the name <i>aString</i> is
- *  omitted, an anonymous structure class will be created. Otherwise,
- *  the name of this struct will appear as a constant in class
- *  <code>Struct</code>, so it must be unique for all
- *  <code>Struct</code>s in the system and should start with a capital
- *  letter. Assigning a structure class to a constant effectively gives
- *  the class the name of the constant.
- *
- *  <code>Struct::new</code> returns a new <code>Class</code> object,
- *  which can then be used to create specific instances of the new
- *  structure. The number of actual parameters must be
- *  less than or equal to the number of attributes defined for this
- *  class; unset parameters default to <code>nil</code>.  Passing too many
- *  parameters will raise an <code>ArgumentError</code>.
- *
- *  The remaining methods listed in this section (class and instance)
- *  are defined for this generated class.
- *
- *     # Create a structure with a name in Struct
- *     Struct.new("Customer", :name, :address)    #=> Struct::Customer
- *     Struct::Customer.new("Dave", "123 Main")   #=> #<struct Struct::Customer name="Dave", address="123 Main">
- *
- *     # Create a structure named by its constant
- *     Customer = Struct.new(:name, :address)     #=> Customer
- *     Customer.new("Dave", "123 Main")           #=> #<struct Customer name="Dave", address="123 Main">
- */
-static mrb_value
-mrb_struct_s_def(mrb_state *mrb, mrb_value klass)
-{
-  mrb_value name, rest;
-  mrb_value *pargv;
-  int argcnt;
-  long i;
-  mrb_value b, st;
-  mrb_sym id;
-  mrb_value *argv;
-  int argc;
-
-  name = mrb_nil_value();
-  rest = mrb_nil_value();
-  mrb_get_args(mrb, "*&", &argv, &argc, &b);
-  if (argc == 0) { /* special case to avoid crash */
-    rest = mrb_ary_new(mrb);
-  } 
-  else {   
-    if (argc > 0) name = argv[0];
-    if (argc > 1) rest = argv[1];
-    if (mrb_array_p(rest)) {
-      if (!mrb_nil_p(name) && mrb_symbol_p(name)) {
-        /* 1stArgument:symbol -> name=nil rest=argv[0]-[n] */
-        mrb_ary_unshift(mrb, rest, name);
-        name = mrb_nil_value();
-      }
-    }
-    else {
-      pargv = &argv[1];
-      argcnt = argc-1;
-      if (!mrb_nil_p(name) && mrb_symbol_p(name)) {
-        /* 1stArgument:symbol -> name=nil rest=argv[0]-[n] */
-        name = mrb_nil_value();
-        pargv = &argv[0];
-        argcnt++;
-      }
-      rest = mrb_ary_new_from_values(mrb, argcnt, pargv);
-    }
-    for (i=0; i<RARRAY_LEN(rest); i++) {
-      id = mrb_to_id(mrb, RARRAY_PTR(rest)[i]);
-      RARRAY_PTR(rest)[i] = mrb_symbol_value(id);
-    }
-  }  
-  st = make_struct(mrb, name, rest, struct_class(mrb));
-  if (!mrb_nil_p(b)) {
-    mrb_funcall(mrb, b, "call", 1, &st);
-  }
-
-  return st;
-}
-
-static int
-num_members(mrb_state *mrb, struct RClass *klass)
-{
-    mrb_value members;
-    members = struct_ivar_get(mrb, mrb_obj_value(klass), mrb_intern(mrb, "__members__"));
-    if (!mrb_array_p(members)) {
-      mrb_raise(mrb, E_TYPE_ERROR, "broken members");
-    }
-    return RARRAY_LEN(members);
-}
-
-/* 15.2.18.4.8  */
-/*
- */
-static mrb_value
-mrb_struct_initialize_withArg(mrb_state *mrb, int argc, mrb_value *argv, mrb_value self)
-{
-  struct RClass *klass = mrb_obj_class(mrb, self);
-  int n;
-  struct RStruct *st;
-
-  n = num_members(mrb, klass);
-  if (n < argc) {
-    mrb_raise(mrb, E_ARGUMENT_ERROR, "struct size differs");
-  }
-  st = RSTRUCT(self);
-  st->ptr = (mrb_value *)mrb_calloc(mrb, sizeof(mrb_value), n);
-  st->len = n;
-  struct_copy(st->ptr, argv, argc);
-
-  return self;
-}
-
-static mrb_value
-mrb_struct_initialize_m(mrb_state *mrb, /*int argc, mrb_value *argv,*/ mrb_value self)
-{
-  mrb_value *argv;
-  int argc;
-
-  mrb_get_args(mrb, "*", &argv, &argc);
-  return mrb_struct_initialize_withArg(mrb, argc, argv, self);
-}
-
-mrb_value
-mrb_struct_initialize(mrb_state *mrb, mrb_value self, mrb_value values)
-{
-  return mrb_struct_initialize_withArg(mrb, RARRAY_LEN(values), RARRAY_PTR(values), self);
-}
-
-static mrb_value
-inspect_struct(mrb_state *mrb, mrb_value s, int recur)
-{
-    const char *cn = mrb_class_name(mrb, mrb_obj_class(mrb, s));
-    mrb_value members, str = mrb_str_new(mrb, "#<struct ", 9);
-    mrb_value *ptr, *ptr_members;
-    long i, len;
-
-    if (cn) {
-      mrb_str_append(mrb, str, mrb_str_new_cstr(mrb, cn));
-    }
-    if (recur) {
-      return mrb_str_cat2(mrb, str, ":...>");
-    }
-
-    members = mrb_struct_members(mrb, s);
-    ptr_members = RARRAY_PTR(members);
-    ptr = RSTRUCT_PTR(s);
-    len = RSTRUCT_LEN(s);
-    for (i=0; i<len; i++) {
-      mrb_value slot;
-      mrb_sym id;
-
-      if (i > 0) {
-          mrb_str_cat2(mrb, str, ", ");
-      }
-      else if (cn) {
-          mrb_str_cat2(mrb, str, " ");
-      }
-      slot = ptr_members[i];
-      id = mrb_symbol(slot);
-      if (mrb_is_local_id(id) || mrb_is_const_id(id)) {
-	const char *name;
-	int len;
-
-	name = mrb_sym2name_len(mrb, id, &len);
-        mrb_str_append(mrb, str, mrb_str_new(mrb, name, len));
-      }
-      else {
-          mrb_str_append(mrb, str, mrb_inspect(mrb, slot));
-      }
-      mrb_str_cat2(mrb, str, "=");
-      mrb_str_append(mrb, str, mrb_inspect(mrb, ptr[i]));
-    }
-    mrb_str_cat2(mrb, str, ">");
-
-    return str;
-}
-
-/*
- * call-seq:
- *   struct.to_s      -> string
- *   struct.inspect   -> string
- *
- * Describe the contents of this struct in a string.
- */
-static mrb_value
-mrb_struct_inspect(mrb_state *mrb, mrb_value s)
-{
-    return inspect_struct(mrb, s, 0);
-}
-
-/* 15.2.18.4.9  */
-/* :nodoc: */
-mrb_value
-mrb_struct_init_copy(mrb_state *mrb, mrb_value copy)
-{
-  mrb_value s;
-
-  mrb_get_args(mrb, "o", &s);
-
-  if (mrb_obj_equal(mrb, copy, s)) return copy;
-  if (!mrb_obj_is_instance_of(mrb, s, mrb_obj_class(mrb, copy))) {
-    mrb_raise(mrb, E_TYPE_ERROR, "wrong argument class");
-  }
-  if (RSTRUCT_LEN(copy) != RSTRUCT_LEN(s)) {
-    mrb_raise(mrb, E_TYPE_ERROR, "struct size mismatch");
-  }
-  struct_copy(RSTRUCT_PTR(copy), RSTRUCT_PTR(s), RSTRUCT_LEN(copy));
-
-  return copy;
-}
-
-static mrb_value
-mrb_struct_aref_id(mrb_state *mrb, mrb_value s, mrb_sym id)
-{
-    mrb_value *ptr, members, *ptr_members;
-    long i, len;
-
-    ptr = RSTRUCT_PTR(s);
-    members = mrb_struct_members(mrb, s);
-    ptr_members = RARRAY_PTR(members);
-    len = RARRAY_LEN(members);
-    for (i=0; i<len; i++) {
-      if (mrb_symbol(ptr_members[i]) == id) {
-          return ptr[i];
-      }
-    }
-    mrb_name_error(mrb, id, "no member '%s' in struct", mrb_sym2name(mrb, id));
-    return mrb_nil_value();            /* not reached */
-}
-
-/* 15.2.18.4.2  */
-/*
- *  call-seq:
- *     struct[symbol]    -> anObject
- *     struct[fixnum]    -> anObject
- *
- *  Attribute Reference---Returns the value of the instance variable
- *  named by <i>symbol</i>, or indexed (0..length-1) by
- *  <i>fixnum</i>. Will raise <code>NameError</code> if the named
- *  variable does not exist, or <code>IndexError</code> if the index is
- *  out of range.
- *
- *     Customer = Struct.new(:name, :address, :zip)
- *     joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
- *
- *     joe["name"]   #=> "Joe Smith"
- *     joe[:name]    #=> "Joe Smith"
- *     joe[0]        #=> "Joe Smith"
- */
-mrb_value
-mrb_struct_aref_n(mrb_state *mrb, mrb_value s, mrb_value idx)
-{
-  long i;
-
-  if (mrb_string_p(idx) || mrb_symbol_p(idx)) {
-    return mrb_struct_aref_id(mrb, s, mrb_to_id(mrb, idx));
-  }
-
-  i = mrb_fixnum(idx);
-  if (i < 0) i = RSTRUCT_LEN(s) + i;
-  if (i < 0)
-      mrb_raisef(mrb, E_INDEX_ERROR, "offset %ld too small for struct(size:%ld)",
-           i, RSTRUCT_LEN(s));
-  if (RSTRUCT_LEN(s) <= i)
-      mrb_raisef(mrb, E_INDEX_ERROR, "offset %ld too large for struct(size:%ld)",
-           i, RSTRUCT_LEN(s));
-  return RSTRUCT_PTR(s)[i];
-}
-
-mrb_value
-mrb_struct_aref(mrb_state *mrb, mrb_value s)
-{
-  mrb_value idx;
-
-  mrb_get_args(mrb, "o", &idx);
-  return mrb_struct_aref_n(mrb, s, idx);
-}
-
-static mrb_value
-mrb_struct_aset_id(mrb_state *mrb, mrb_value s, mrb_sym id, mrb_value val)
-{
-    mrb_value members, *ptr, *ptr_members;
-    long i, len;
-
-    members = mrb_struct_members(mrb, s);
-    len = RARRAY_LEN(members);
-    if (RSTRUCT_LEN(s) != len) {
-      mrb_raisef(mrb, E_TYPE_ERROR, "struct size differs (%ld required %ld given)",
-             len, RSTRUCT_LEN(s));
-    }
-    ptr = RSTRUCT_PTR(s);
-    ptr_members = RARRAY_PTR(members);
-    for (i=0; i<len; i++) {
-      if (mrb_symbol(ptr_members[i]) == id) {
-          ptr[i] = val;
-          return val;
-      }
-    }
-    mrb_name_error(mrb, id, "no member '%s' in struct", mrb_sym2name(mrb, id));
-    return val; /* not reach */
-}
-
-/* 15.2.18.4.3  */
-/*
- *  call-seq:
- *     struct[symbol] = obj    -> obj
- *     struct[fixnum] = obj    -> obj
- *
- *  Attribute Assignment---Assigns to the instance variable named by
- *  <i>symbol</i> or <i>fixnum</i> the value <i>obj</i> and
- *  returns it. Will raise a <code>NameError</code> if the named
- *  variable does not exist, or an <code>IndexError</code> if the index
- *  is out of range.
- *
- *     Customer = Struct.new(:name, :address, :zip)
- *     joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
- *
- *     joe["name"] = "Luke"
- *     joe[:zip]   = "90210"
- *
- *     joe.name   #=> "Luke"
- *     joe.zip    #=> "90210"
- */
-
-mrb_value
-mrb_struct_aset(mrb_state *mrb, mrb_value s)
-{
-  long i;
-  mrb_value idx;
-  mrb_value val;
-
-  mrb_get_args(mrb, "oo", &idx, &val);
-
-  if (mrb_string_p(idx) || mrb_symbol_p(idx)) {
-    return mrb_struct_aset_id(mrb, s, mrb_to_id(mrb, idx), val);
-  }
-
-  i = mrb_fixnum(idx);
-  if (i < 0) i = RSTRUCT_LEN(s) + i;
-  if (i < 0) {
-    mrb_raisef(mrb, E_INDEX_ERROR, "offset %ld too small for struct(size:%ld)",
-	      i, RSTRUCT_LEN(s));
-  }
-  if (RSTRUCT_LEN(s) <= i) {
-    mrb_raisef(mrb, E_INDEX_ERROR, "offset %ld too large for struct(size:%ld)",
-	      i, RSTRUCT_LEN(s));
-  }
-  return RSTRUCT_PTR(s)[i] = val;
-}
-
-/* 15.2.18.4.1  */
-/*
- *  call-seq:
- *     struct == other_struct     -> true or false
- *
- *  Equality---Returns <code>true</code> if <i>other_struct</i> is
- *  equal to this one: they must be of the same class as generated by
- *  <code>Struct::new</code>, and the values of all instance variables
- *  must be equal (according to <code>Object#==</code>).
- *
- *     Customer = Struct.new(:name, :address, :zip)
- *     joe   = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
- *     joejr = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
- *     jane  = Customer.new("Jane Doe", "456 Elm, Anytown NC", 12345)
- *     joe == joejr   #=> true
- *     joe == jane    #=> false
- */
-
-static mrb_value
-mrb_struct_equal(mrb_state *mrb, mrb_value s)
-{
-  mrb_value s2;
-  mrb_value *ptr, *ptr2;
-  long i, len;
-
-  mrb_get_args(mrb, "o", &s2);
-  if (mrb_obj_equal(mrb, s, s2)) return mrb_true_value();
-  if (mrb_type(s2) != MRB_TT_STRUCT) return mrb_false_value();
-  if (mrb_obj_class(mrb, s) != mrb_obj_class(mrb, s2)) return mrb_false_value();
-  if (RSTRUCT_LEN(s) != RSTRUCT_LEN(s2)) {
-    mrb_bug("inconsistent struct"); /* should never happen */
-  }
-  ptr = RSTRUCT_PTR(s);
-  ptr2 = RSTRUCT_PTR(s2);
-  len = RSTRUCT_LEN(s);
-  for (i=0; i<len; i++) {
-    if (!mrb_equal(mrb, ptr[i], ptr2[i])) return mrb_false_value();
-  }
-  return mrb_true_value();
-}
-
-/* 15.2.18.4.12(x)  */
-/*
- * code-seq:
- *   struct.eql?(other)   -> true or false
- *
- * Two structures are equal if they are the same object, or if all their
- * fields are equal (using <code>eql?</code>).
- */
-static mrb_value
-mrb_struct_eql(mrb_state *mrb, mrb_value s)
-{
-  mrb_value s2;
-  mrb_value *ptr, *ptr2;
-  long i, len;
-
-  mrb_get_args(mrb, "o", &s2);
-  if (mrb_obj_equal(mrb, s, s2)) return mrb_true_value();
-  if (mrb_type(s2) != MRB_TT_STRUCT) return mrb_false_value();
-  if (mrb_obj_class(mrb, s) != mrb_obj_class(mrb, s2)) return mrb_false_value();
-  if (RSTRUCT_LEN(s) != RSTRUCT_LEN(s2)) {
-    mrb_bug("inconsistent struct"); /* should never happen */
-  }
-
-  ptr = RSTRUCT_PTR(s);
-  ptr2 = RSTRUCT_PTR(s2);
-  len = RSTRUCT_LEN(s);
-  for (i=0; i<len; i++) {
-    if (!mrb_eql(mrb, ptr[i], ptr2[i])) return mrb_false_value();
-  }
-  return mrb_true_value();
-}
-
-/*
- *  A <code>Struct</code> is a convenient way to bundle a number of
- *  attributes together, using accessor methods, without having to write
- *  an explicit class.
- *
- *  The <code>Struct</code> class is a generator of specific classes,
- *  each one of which is defined to hold a set of variables and their
- *  accessors. In these examples, we'll call the generated class
- *  ``<i>Customer</i>Class,'' and we'll show an example instance of that
- *  class as ``<i>Customer</i>Inst.''
- *
- *  In the descriptions that follow, the parameter <i>symbol</i> refers
- *  to a symbol, which is either a quoted string or a
- *  <code>Symbol</code> (such as <code>:name</code>).
- */
-void
-mrb_init_struct(mrb_state *mrb)
-{
-  struct RClass *st;
-  st = mrb_define_class(mrb, "Struct",  mrb->object_class);
-
-  mrb_define_class_method(mrb, st, "new",             mrb_struct_s_def,       ARGS_ANY());  /* 15.2.18.3.1  */
-
-  mrb_define_method(mrb, st,       "==",              mrb_struct_equal,       ARGS_REQ(1)); /* 15.2.18.4.1  */
-  mrb_define_method(mrb, st,       "[]",              mrb_struct_aref,        ARGS_REQ(1)); /* 15.2.18.4.2  */
-  mrb_define_method(mrb, st,       "[]=",             mrb_struct_aset,        ARGS_REQ(2)); /* 15.2.18.4.3  */
-  mrb_define_method(mrb, st,       "members",         mrb_struct_members_m,   ARGS_NONE()); /* 15.2.18.4.6  */
-  mrb_define_method(mrb, st,       "initialize",      mrb_struct_initialize_m,ARGS_ANY());  /* 15.2.18.4.8  */
-  mrb_define_method(mrb, st,       "initialize_copy", mrb_struct_init_copy,   ARGS_REQ(1)); /* 15.2.18.4.9  */
-  mrb_define_method(mrb, st,       "inspect",         mrb_struct_inspect,     ARGS_NONE()); /* 15.2.18.4.10(x)  */
-  mrb_define_alias(mrb, st,        "to_s", "inspect");                                      /* 15.2.18.4.11(x)  */
-  mrb_define_method(mrb, st,       "eql?",            mrb_struct_eql,         ARGS_REQ(1)); /* 15.2.18.4.12(x)  */
-
-}
-#endif	/* ENABLE_STRUCT */