This file is indexed.

/usr/include/luabind/object.hpp is in libluabind-dev 0.9.1+dfsg-11.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
// Copyright (c) 2005 Daniel Wallin and Arvid Norberg

// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
// ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
// OR OTHER DEALINGS IN THE SOFTWARE.

#ifndef LUABIND_OBJECT_050419_HPP
#define LUABIND_OBJECT_050419_HPP

#include <boost/implicit_cast.hpp> // detail::push()
#include <boost/ref.hpp> // detail::push()
#include <boost/mpl/bool.hpp> // value_wrapper_traits specializations
#include <boost/mpl/apply_wrap.hpp>
#include <boost/tuple/tuple.hpp>
#include <boost/optional.hpp>

#include <luabind/nil.hpp>
#include <luabind/value_wrapper.hpp>
#include <luabind/detail/pcall.hpp>
#include <luabind/handle.hpp>
#include <luabind/from_stack.hpp>
#include <luabind/detail/policy.hpp>
#include <luabind/detail/stack_utils.hpp>
#include <luabind/detail/convert_to_lua.hpp> // REFACTOR
#include <luabind/typeid.hpp>

#include <boost/iterator/iterator_facade.hpp> // iterator

#include <boost/preprocessor/iteration/iterate.hpp>
#include <boost/utility/enable_if.hpp>

#if LUA_VERSION_NUM < 502
# define lua_compare(L, index1, index2, fn) fn(L, index1, index2)
# define LUA_OPEQ lua_equal
# define LUA_OPLT lua_lessthan
# define lua_rawlen lua_objlen
# define lua_pushglobaltable(L) lua_pushvalue(L, LUA_GLOBALSINDEX)
#endif

namespace luabind {

namespace detail 
{
  namespace mpl = boost::mpl;
  
  template<class T, class ConverterGenerator>
  void push_aux(lua_State* interpreter, T& value, ConverterGenerator*)
  {
      typedef typename boost::mpl::if_<
          boost::is_reference_wrapper<T>
        , BOOST_DEDUCED_TYPENAME boost::unwrap_reference<T>::type&
        , T
      >::type unwrapped_type;

      typename mpl::apply_wrap2<
          ConverterGenerator,unwrapped_type,cpp_to_lua
      >::type cv;

      cv.apply(
          interpreter
        , boost::implicit_cast<
              BOOST_DEDUCED_TYPENAME boost::unwrap_reference<T>::type&
          >(value)
      );
  }

  template<class T, class Policies>
  void push(lua_State* interpreter, T& value, Policies const&)
  {
      typedef typename find_conversion_policy<
          0
        , Policies
      >::type converter_policy;

      push_aux(interpreter, value, (converter_policy*)0);
  }

  template<class T>
  void push(lua_State* interpreter, T& value)
  {
      push(interpreter, value, null_type());
  }

} // namespace detail

namespace adl
{
  namespace mpl = boost::mpl;
  
  template <class T>
  class object_interface;
  
  namespace is_object_interface_aux
  {
    typedef char (&yes)[1];
    typedef char (&no)[2];
    
    template <class T>
    yes check(object_interface<T>*);
    no check(void*);

    template <class T>
    struct impl 
    {
        BOOST_STATIC_CONSTANT(bool, value =
            sizeof(is_object_interface_aux::check((T*)0)) == sizeof(yes)
        );

        typedef mpl::bool_<value> type;
    };

  } // namespace detail

  template <class T>
  struct is_object_interface
    : is_object_interface_aux::impl<T>::type
  {};

  template <class R, class T, class U>
  struct enable_binary
# ifndef BOOST_NO_SFINAE
    : boost::enable_if<
          mpl::or_<
              is_object_interface<T>
            , is_object_interface<U>
          >
        , R
      >
  {};
# else
  {
      typedef R type;
  };
# endif

  template<class T, class U>
  int binary_interpreter(lua_State*& L, T const& lhs, U const& rhs
    , boost::mpl::true_, boost::mpl::true_)
  {
       L = value_wrapper_traits<T>::interpreter(lhs);
		 lua_State* L2 = value_wrapper_traits<U>::interpreter(rhs);

       // you are comparing objects with different interpreters
       // that's not allowed.
		 assert(L == L2 || L == 0 || L2 == 0);

       // if the two objects we compare have different interpreters
       // then they

       if (L != L2) return -1;
       if (L == 0) return 1;
       return 0;
  }
	
  template<class T, class U>
  int binary_interpreter(lua_State*& L, T const& x, U const&
    , boost::mpl::true_, boost::mpl::false_)
  {
       L = value_wrapper_traits<T>::interpreter(x);
       return 0;
  }

  template<class T, class U>
  int binary_interpreter(lua_State*& L, T const&, U const& x, boost::mpl::false_, boost::mpl::true_)
  {
      L = value_wrapper_traits<U>::interpreter(x);
      return 0;
  }

  template<class T, class U>
  int binary_interpreter(lua_State*& L, T const& x, U const& y)
  {
      return binary_interpreter(
          L
        , x
        , y
        , is_value_wrapper<T>()
        , is_value_wrapper<U>()
      );
  }

#define LUABIND_BINARY_OP_DEF(op, fn) \
  template<class LHS, class RHS> \
  typename enable_binary<bool,LHS,RHS>::type \
  operator op(LHS const& lhs, RHS const& rhs) \
  { \
      lua_State* L = 0; \
      switch (binary_interpreter(L, lhs, rhs)) \
      { \
          case 1: \
              return true; \
          case -1: \
              return false; \
      } \
\
      assert(L); \
\
      detail::stack_pop pop1(L, 1); \
      detail::push(L, lhs); \
      detail::stack_pop pop2(L, 1); \
      detail::push(L, rhs); \
\
      return lua_compare(L, -1, -2, fn) != 0; \
  }

LUABIND_BINARY_OP_DEF(==, LUA_OPEQ)
LUABIND_BINARY_OP_DEF(<, LUA_OPLT)

  template<class ValueWrapper>
  std::ostream& operator<<(std::ostream& os
    , object_interface<ValueWrapper> const& v)
  {
      using namespace luabind;
      lua_State* interpreter = value_wrapper_traits<ValueWrapper>::interpreter(
          static_cast<ValueWrapper const&>(v));
      detail::stack_pop pop(interpreter, 1);
      value_wrapper_traits<ValueWrapper>::unwrap(interpreter
        , static_cast<ValueWrapper const&>(v));
		char const* p = lua_tostring(interpreter, -1);
        std::size_t len = lua_rawlen(interpreter, -1);
		std::copy(p, p + len, std::ostream_iterator<char>(os));
		return os;
	}

#undef LUABIND_BINARY_OP_DEF

  template<class LHS, class RHS>
  typename enable_binary<bool,LHS,RHS>::type
  operator>(LHS const& lhs, RHS const& rhs)
  {
      return !(lhs < rhs || lhs == rhs);
  }

  template<class LHS, class RHS>
  typename enable_binary<bool,LHS,RHS>::type 
  operator<=(LHS const& lhs, RHS const& rhs)
  {
      return lhs < rhs || lhs == rhs;
  }

  template<class LHS, class RHS>
  typename enable_binary<bool,LHS,RHS>::type 
  operator>=(LHS const& lhs, RHS const& rhs)
  {
      return !(lhs < rhs);
  }

  template<class LHS, class RHS>
  typename enable_binary<bool,LHS,RHS>::type 
  operator!=(LHS const& lhs, RHS const& rhs)
  {
      return !(lhs == rhs);
  }

  template<class ValueWrapper, class Arguments>
  struct call_proxy;

  template<class Next>
  class index_proxy;

  class object;
  
  template<class Derived>
  class object_interface
  {
      struct safe_bool_type {};
  public:
      ~object_interface() {}

      call_proxy<Derived, boost::tuples::tuple<> > operator()();

      template<class A0>
      call_proxy<
          Derived
        , boost::tuples::tuple<A0 const*>
      > operator()(A0 const& a0)
      {
          typedef boost::tuples::tuple<A0 const*> arguments;

          return call_proxy<Derived, arguments>(
              derived()
            , arguments(&a0)
          );
      }

      template<class A0, class A1>
      call_proxy<
          Derived
        , boost::tuples::tuple<A0 const*, A1 const*>
      > operator()(A0 const& a0, A1 const& a1)
      {
          typedef boost::tuples::tuple<A0 const*, A1 const*> arguments;

          return call_proxy<Derived, arguments>(
              derived()
            , arguments(&a0, &a1)
          );
      }

      // The rest of the overloads are PP-generated.
      #define BOOST_PP_ITERATION_PARAMS_1 (3, \
          (3, LUABIND_MAX_ARITY, <luabind/detail/object_call.hpp>))
      #include BOOST_PP_ITERATE()

      operator safe_bool_type*() const
      {
          lua_State* L = value_wrapper_traits<Derived>::interpreter(derived());

          if (!L)
              return 0;

          value_wrapper_traits<Derived>::unwrap(L, derived());
          detail::stack_pop pop(L, 1);

          return lua_toboolean(L, -1) == 1 ? (safe_bool_type*)1 : 0;
      }

  private:
      Derived& derived()
      {
          return *static_cast<Derived*>(this);
      }

      Derived const& derived() const
      {
          return *static_cast<Derived const*>(this);
      }
  };

#ifdef LUABIND_USE_VALUE_WRAPPER_TAG
  struct iterator_proxy_tag;
#endif
  
  template<class AccessPolicy>
  class iterator_proxy
    : public object_interface<iterator_proxy<AccessPolicy> >
  {
  public:
#ifdef LUABIND_USE_VALUE_WRAPPER_TAG
      typedef iterator_proxy_tag value_wrapper_tag;
#endif

      iterator_proxy(lua_State* interpreter, handle const& table, handle const& key)
        : m_interpreter(interpreter)
        , m_table_index(lua_gettop(interpreter) + 1)
        , m_key_index(m_table_index + 1)
      {
          table.push(m_interpreter);
          key.push(m_interpreter);
      }

      iterator_proxy(iterator_proxy const& other)
        : m_interpreter(other.m_interpreter)
        , m_table_index(other.m_table_index)
        , m_key_index(other.m_key_index)
      {
          other.m_interpreter = 0;
      }

      ~iterator_proxy()
      {
          if (m_interpreter)
              lua_pop(m_interpreter, 2);
      }

		// this will set the value to nil
		iterator_proxy & operator=(luabind::detail::nil_type)
		{
          lua_pushvalue(m_interpreter, m_key_index);
			 lua_pushnil(m_interpreter);
          AccessPolicy::set(m_interpreter, m_table_index);
          return *this;
		}

      template<class T>
      iterator_proxy& operator=(T const& value)
      {
          lua_pushvalue(m_interpreter, m_key_index);
          detail::push(m_interpreter, value);
          AccessPolicy::set(m_interpreter, m_table_index);
          return *this;
      }

      template<class Key>
      index_proxy<iterator_proxy<AccessPolicy> > operator[](Key const& key)
      {
          return index_proxy<iterator_proxy<AccessPolicy> >(
              *this, m_interpreter, key
          );
      }

      // This is non-const to prevent conversion on lvalues.
      operator object();

      lua_State* interpreter() const
      {
          return m_interpreter;
      }

      // TODO: Why is it non-const?
      void push(lua_State* interpreter)
      {
          assert(interpreter == m_interpreter);
          lua_pushvalue(m_interpreter, m_key_index);
          AccessPolicy::get(m_interpreter, m_table_index);
      }

  private:
      mutable lua_State* m_interpreter;
      int m_table_index;
      int m_key_index;
  };

} // namespace adl

namespace detail
{
  struct basic_access
  {
      static void set(lua_State* interpreter, int table)
      {
          lua_settable(interpreter, table);
      }

      static void get(lua_State* interpreter, int table)
      {
          lua_gettable(interpreter, table);
      }
  };

  struct raw_access
  {
      static void set(lua_State* interpreter, int table)
      {
          lua_rawset(interpreter, table);
      }

      static void get(lua_State* interpreter, int table)
      {
          lua_rawget(interpreter, table);
      }
  };

  template<class AccessPolicy>
  class basic_iterator 
    : public boost::iterator_facade<
        basic_iterator<AccessPolicy>
      , adl::iterator_proxy<AccessPolicy>
      , boost::single_pass_traversal_tag
      , adl::iterator_proxy<AccessPolicy>
    >
  {
  public:
      basic_iterator()
        : m_interpreter(0)
      {}

      template<class ValueWrapper>
      explicit basic_iterator(ValueWrapper const& value_wrapper)
        : m_interpreter(
              value_wrapper_traits<ValueWrapper>::interpreter(value_wrapper)
          )
      {
          detail::stack_pop pop(m_interpreter, 1);
          value_wrapper_traits<ValueWrapper>::unwrap(m_interpreter, value_wrapper);

          lua_pushnil(m_interpreter);
          if (lua_next(m_interpreter, -2) != 0)
          {
              detail::stack_pop pop(m_interpreter, 2);
              handle(m_interpreter, -2).swap(m_key);
          }
          else
          {
              m_interpreter = 0;
              return;
          }

          handle(m_interpreter, -1).swap(m_table);
      }

      adl::object key() const;

  private:
      friend class boost::iterator_core_access;

      void increment()
      {
          m_table.push(m_interpreter);
          m_key.push(m_interpreter);

          detail::stack_pop pop(m_interpreter, 1);

          if (lua_next(m_interpreter, -2) != 0)
          {
              m_key.replace(m_interpreter, -2);
              lua_pop(m_interpreter, 2);
          }
          else
          {
              m_interpreter = 0;
              handle().swap(m_table);
              handle().swap(m_key);
          }
      }

      bool equal(basic_iterator const& other) const
      {
          if (m_interpreter == 0 && other.m_interpreter == 0)
              return true;

          if (m_interpreter != other.m_interpreter)
              return false;

          detail::stack_pop pop(m_interpreter, 2);
          m_key.push(m_interpreter);
          other.m_key.push(m_interpreter);
          return lua_compare(m_interpreter, -2, -1, LUA_OPEQ) != 0;
      }

      adl::iterator_proxy<AccessPolicy> dereference() const 
      {
          return adl::iterator_proxy<AccessPolicy>(m_interpreter, m_table, m_key);
      }

      lua_State* m_interpreter;
      handle m_table;
      handle m_key;
  };

#if BOOST_VERSION < 105700

// Needed because of some strange ADL issues.

#define LUABIND_OPERATOR_ADL_WKND(op) \
  inline bool operator op( \
      basic_iterator<basic_access> const& x \
    , basic_iterator<basic_access> const& y) \
  { \
      return boost::operator op(x, y); \
  } \
 \
  inline bool operator op( \
      basic_iterator<raw_access> const& x \
    , basic_iterator<raw_access> const& y) \
  { \
      return boost::operator op(x, y); \
  }

  LUABIND_OPERATOR_ADL_WKND(==)
  LUABIND_OPERATOR_ADL_WKND(!=)

#undef LUABIND_OPERATOR_ADL_WKND

#endif // BOOST_VERSION < 105700
 
} // namespace detail

namespace adl
{
 
#ifdef LUABIND_USE_VALUE_WRAPPER_TAG
  struct index_proxy_tag;    
#endif

  template<class Next>
  class index_proxy
    : public object_interface<index_proxy<Next> >
  {
  public:
#ifdef LUABIND_USE_VALUE_WRAPPER_TAG
      typedef index_proxy_tag value_wrapper_tag;
#endif

      typedef index_proxy<Next> this_type;

      template<class Key>
      index_proxy(Next const& next, lua_State* interpreter, Key const& key)
        : m_interpreter(interpreter)
        , m_key_index(lua_gettop(interpreter) + 1)
        , m_next(next)
      {
          detail::push(m_interpreter, key);
      }

      index_proxy(index_proxy const& other)
        : m_interpreter(other.m_interpreter)
        , m_key_index(other.m_key_index)
        , m_next(other.m_next)
      {
          other.m_interpreter = 0;
      }

      ~index_proxy()
      {
          if (m_interpreter)
              lua_pop(m_interpreter, 1);
      }

      // This is non-const to prevent conversion on lvalues.
      operator object();

		// this will set the value to nil
		this_type& operator=(luabind::detail::nil_type)
		{
	       value_wrapper_traits<Next>::unwrap(m_interpreter, m_next);
          detail::stack_pop pop(m_interpreter, 1);

          lua_pushvalue(m_interpreter, m_key_index);
			 lua_pushnil(m_interpreter);
          lua_settable(m_interpreter, -3);
          return *this;
		}
		
      template<class T>
      this_type& operator=(T const& value)
      {
          value_wrapper_traits<Next>::unwrap(m_interpreter, m_next);
          detail::stack_pop pop(m_interpreter, 1);

          lua_pushvalue(m_interpreter, m_key_index);
          detail::push(m_interpreter, value);
          lua_settable(m_interpreter, -3);
          return *this;
      }

      this_type& operator=(this_type const& value)
      {
          value_wrapper_traits<Next>::unwrap(m_interpreter, m_next);
          detail::stack_pop pop(m_interpreter, 1);

          lua_pushvalue(m_interpreter, m_key_index);
          detail::push(m_interpreter, value);
          lua_settable(m_interpreter, -3);
          return *this;
      }

      template<class T>
      index_proxy<this_type> operator[](T const& key)
      {
          return index_proxy<this_type>(*this, m_interpreter, key);
      }

      void push(lua_State* interpreter);

      lua_State* interpreter() const
      {
          return m_interpreter;
      }

  private:
		struct hidden_type {};
		
//      this_type& operator=(index_proxy<Next> const&);

      mutable lua_State* m_interpreter;
      int m_key_index;

      Next const& m_next;
  };

} // namespace adl

typedef detail::basic_iterator<detail::basic_access> iterator;
typedef detail::basic_iterator<detail::raw_access> raw_iterator;

#ifndef LUABIND_USE_VALUE_WRAPPER_TAG
template<class T>
struct value_wrapper_traits<adl::index_proxy<T> >
#else
template<>
struct value_wrapper_traits<adl::index_proxy_tag>
#endif
{
    typedef boost::mpl::true_ is_specialized;

    template<class Next>
    static lua_State* interpreter(adl::index_proxy<Next> const& proxy)
    {
        return proxy.interpreter();
    }

    template<class Next>
    static void unwrap(lua_State* interpreter, adl::index_proxy<Next> const& proxy)
    {
        const_cast<adl::index_proxy<Next>&>(proxy).push(interpreter);
    }
};

#ifndef LUABIND_USE_VALUE_WRAPPER_TAG
template<class AccessPolicy>
struct value_wrapper_traits<adl::iterator_proxy<AccessPolicy> >
#else
template<>
struct value_wrapper_traits<adl::iterator_proxy_tag>
#endif
{
    typedef boost::mpl::true_ is_specialized;

    template<class Proxy>
    static lua_State* interpreter(Proxy const& p)
    {
        return p.interpreter();
    }

    template<class Proxy>
    static void unwrap(lua_State* interpreter, Proxy const& p)
    {
        // TODO: Why const_cast?
        const_cast<Proxy&>(p).push(interpreter);
    }
};

namespace adl
{

  // An object holds a reference to a Lua value residing
  // in the registry.
  class object : public object_interface<object>
  {
  public:
      object()
      {}

      explicit object(handle const& other)
        : m_handle(other)
      {}

      explicit object(from_stack const& stack_reference)
        : m_handle(stack_reference.interpreter, stack_reference.index)
      {
      }

      template<class T>
      object(lua_State* interpreter, T const& value)
      {
          detail::push(interpreter, value);
          detail::stack_pop pop(interpreter, 1);
          handle(interpreter, -1).swap(m_handle);
      }

      template<class T, class Policies>
      object(lua_State* interpreter, T const& value, Policies const&)
      {
          detail::push(interpreter, value, Policies());
          detail::stack_pop pop(interpreter, 1);
          handle(interpreter, -1).swap(m_handle);
      }

      void push(lua_State* interpreter) const;
      lua_State* interpreter() const;
      bool is_valid() const;

      template<class T>
      index_proxy<object> operator[](T const& key) const
      {
          return index_proxy<object>(
              *this, m_handle.interpreter(), key
          );
      }

      void swap(object& other)
      {
          m_handle.swap(other.m_handle);
      }

  private:
      handle m_handle;
  };

  inline void object::push(lua_State* interpreter) const
  {
      m_handle.push(interpreter);
  }

  inline lua_State* object::interpreter() const
  {
      return m_handle.interpreter();
  }

  inline bool object::is_valid() const
  {
      return m_handle.interpreter() != 0;
  }

  class argument : public object_interface<argument>
  {
  public:
	  argument(from_stack const& stack_reference)
		: m_interpreter(stack_reference.interpreter)
		, m_index(stack_reference.index)
	  {
		  if (m_index < 0)
			  m_index = lua_gettop(m_interpreter) - m_index + 1;
	  }

      template<class T>
      index_proxy<argument> operator[](T const& key) const
      {
          return index_proxy<argument>(*this, m_interpreter, key);
      }

	  void push(lua_State* L) const
	  {
		  lua_pushvalue(L, m_index);
	  }

	  lua_State* interpreter() const
	  {
		  return m_interpreter;
	  }

  private:
	  lua_State* m_interpreter;
	  int m_index;
  };

} // namespace adl

using adl::object;
using adl::argument;

#ifndef LUABIND_USE_VALUE_WRAPPER_TAG
template <class ValueWrapper, class Arguments>
struct value_wrapper_traits<adl::call_proxy<ValueWrapper, Arguments> >
#else
template<>
struct value_wrapper_traits<adl::call_proxy_tag>
#endif
{
    typedef boost::mpl::true_ is_specialized;

    template<class W, class A>
    static lua_State* interpreter(adl::call_proxy<W,A> const& proxy)
    {
        return value_wrapper_traits<W>::interpreter(*proxy.value_wrapper);
    }

    template<class W, class A>
    static void unwrap(lua_State*, adl::call_proxy<W,A> const& proxy)
    {
        object result = const_cast<adl::call_proxy<W,A>&>(proxy);
        result.push(result.interpreter());
    }
};

template<>
struct value_wrapper_traits<object>
{
    typedef boost::mpl::true_ is_specialized;

    static lua_State* interpreter(object const& value)
    {
        return value.interpreter();
    }

    static void unwrap(lua_State* interpreter, object const& value)
    {
        value.push(interpreter);
    }

    static bool check(...)
    {
        return true;
    }
};

template<>
struct value_wrapper_traits<argument>
{
    typedef boost::mpl::true_ is_specialized;

    static lua_State* interpreter(argument const& value)
    {
        return value.interpreter();
    }

    static void unwrap(lua_State* interpreter, argument const& value)
    {
        value.push(interpreter);
    }

    static bool check(...)
    {
        return true;
    }
};

template<class Next>
inline void adl::index_proxy<Next>::push(lua_State* interpreter)
{
    assert(interpreter == m_interpreter);

    value_wrapper_traits<Next>::unwrap(m_interpreter, m_next);

    lua_pushvalue(m_interpreter, m_key_index);
    lua_gettable(m_interpreter, -2);
    lua_remove(m_interpreter, -2);
}

template<class Next>
inline adl::index_proxy<Next>::operator object()
{
    detail::stack_pop pop(m_interpreter, 1);
    push(m_interpreter);
    return object(from_stack(m_interpreter, -1));
}

template<class AccessPolicy>
adl::iterator_proxy<AccessPolicy>::operator object()
{
    lua_pushvalue(m_interpreter, m_key_index);
    AccessPolicy::get(m_interpreter, m_table_index);
    detail::stack_pop pop(m_interpreter, 1);
    return object(from_stack(m_interpreter, -1));
}

template<class AccessPolicy>
object detail::basic_iterator<AccessPolicy>::key() const
{
    return object(m_key);
}

namespace detail 
{

  template<
      class T
    , class ValueWrapper
    , class Policies
    , class ErrorPolicy
    , class ReturnType
  >
  ReturnType object_cast_aux(
      ValueWrapper const& value_wrapper
    , T*
    , Policies*
    , ErrorPolicy*
    , ReturnType*
  )
  {
      lua_State* interpreter = value_wrapper_traits<ValueWrapper>::interpreter(
          value_wrapper
      );

#ifndef LUABIND_NO_ERROR_CHECKING
      if (!interpreter) 
          return ErrorPolicy::handle_error(interpreter, typeid(void));
#endif

      value_wrapper_traits<ValueWrapper>::unwrap(interpreter, value_wrapper);

      detail::stack_pop pop(interpreter, 1);

      typedef typename detail::find_conversion_policy<
          0
        , Policies
      >::type converter_generator;

      typename mpl::apply_wrap2<converter_generator, T, lua_to_cpp>::type cv;

#ifndef LUABIND_NO_ERROR_CHECKING
      if (cv.match(interpreter, LUABIND_DECORATE_TYPE(T), -1) < 0)
      {
          return ErrorPolicy::handle_error(interpreter, typeid(T));
      }
#endif

      return cv.apply(interpreter, LUABIND_DECORATE_TYPE(T), -1);
  }

# ifdef BOOST_MSVC
#  pragma warning(push)
#  pragma warning(disable:4702) // unreachable code
# endif

  template<class T>
  struct throw_error_policy
  {
      static T handle_error(lua_State* interpreter, type_id const& type_info)
      {
#ifndef LUABIND_NO_EXCEPTIONS
          throw cast_failed(interpreter, type_info);
#else
          cast_failed_callback_fun e = get_cast_failed_callback();
          if (e) e(interpreter, type_info);

          assert(0 && "object_cast failed. If you want to handle this error use "
              "luabind::set_error_callback()");
          std::terminate();
#endif
          return *(typename boost::remove_reference<T>::type*)0;
      }
  };

# ifdef BOOST_MSVC
#  pragma warning(pop)
# endif

  template<class T>
  struct nothrow_error_policy
  {
      static boost::optional<T> handle_error(lua_State*, type_id const&)
      {
          return boost::optional<T>();
      }
  };

} // namespace detail

template<class T, class ValueWrapper>
T object_cast(ValueWrapper const& value_wrapper)
{
    return detail::object_cast_aux(
        value_wrapper
      , (T*)0
      , (detail::null_type*)0
      , (detail::throw_error_policy<T>*)0
      , (T*)0
    );
}

template<class T, class ValueWrapper, class Policies>
T object_cast(ValueWrapper const& value_wrapper, Policies const&)
{
    return detail::object_cast_aux(
        value_wrapper
      , (T*)0
      , (Policies*)0
      , (detail::throw_error_policy<T>*)0
      , (T*)0
    );
}

template<class T, class ValueWrapper>
boost::optional<T> object_cast_nothrow(ValueWrapper const& value_wrapper)
{
    return detail::object_cast_aux(
        value_wrapper
      , (T*)0
      , (detail::null_type*)0
      , (detail::nothrow_error_policy<T>*)0
      , (boost::optional<T>*)0
    );
}

template<class T, class ValueWrapper, class Policies>
boost::optional<T> object_cast_nothrow(ValueWrapper const& value_wrapper, Policies const&)
{
    return detail::object_cast_aux(
        value_wrapper
      , (T*)0
      , (Policies*)0
      , (detail::nothrow_error_policy<T>*)0
      , (boost::optional<T>*)0
    );
}

namespace detail
{

  template<int Index>
  struct push_args_from_tuple
  {
      template<class H, class T, class Policies>
      inline static void apply(lua_State* L, const boost::tuples::cons<H, T>& x, const Policies& p) 
      {
          convert_to_lua_p<Index>(L, *x.get_head(), p);
          push_args_from_tuple<Index+1>::apply(L, x.get_tail(), p);
      }

      template<class H, class T>
      inline static void apply(lua_State* L, const boost::tuples::cons<H, T>& x) 
      {
          convert_to_lua(L, *x.get_head());
          push_args_from_tuple<Index+1>::apply(L, x.get_tail());
      }

      template<class Policies>
      inline static void apply(lua_State*, const boost::tuples::null_type&, const Policies&) {}

      inline static void apply(lua_State*, const boost::tuples::null_type&) {}
  };

} // namespace detail

namespace adl
{

  template<class ValueWrapper, class Arguments>
  struct call_proxy
  {
      call_proxy(ValueWrapper& value_wrapper, Arguments arguments)
        : value_wrapper(&value_wrapper)
        , arguments(arguments)
      {}

      call_proxy(call_proxy const& other)
        : value_wrapper(other.value_wrapper)
        , arguments(other.arguments)
      {
          other.value_wrapper = 0;
      }

      ~call_proxy()
      {
          if (value_wrapper)
              call((detail::null_type*)0);
      }

      operator object()
      {
          return call((detail::null_type*)0);
      }

      template<class Policies>
      object operator[](Policies const&)
      {
          return call((Policies*)0);
      }

      template<class Policies>
      object call(Policies*)
      {
          lua_State* interpreter = value_wrapper_traits<ValueWrapper>::interpreter(
              *value_wrapper
          );

          value_wrapper_traits<ValueWrapper>::unwrap(
              interpreter
            , *value_wrapper
          );

          value_wrapper = 0;

          detail::push_args_from_tuple<1>::apply(interpreter, arguments, Policies());

          if (detail::pcall(interpreter, boost::tuples::length<Arguments>::value, 1))
          {
#ifndef LUABIND_NO_EXCEPTIONS
              throw luabind::error(interpreter);
#else
              error_callback_fun e = get_error_callback();
              if (e) e(interpreter);

              assert(0 && "the lua function threw an error and exceptions are disabled."
                  "if you want to handle this error use luabind::set_error_callback()");
              std::terminate();
#endif
          }

          detail::stack_pop pop(interpreter, 1);
          return object(from_stack(interpreter, -1));
      }

      mutable ValueWrapper* value_wrapper;
      Arguments arguments;
  };

  template<class Derived>
  call_proxy<Derived, boost::tuples::tuple<> >
  object_interface<Derived>::operator()()
  {
      return call_proxy<Derived, boost::tuples::tuple<> >(
          derived()
        , boost::tuples::tuple<>()
      );
  }

  // Simple value_wrapper adaptor with the sole purpose of helping with
  // overload resolution. Use this as a function parameter type instead
  // of "object" or "argument" to restrict the parameter to Lua tables.
  template <class Base = object>
  struct table : Base
  {
      table(from_stack const& stack_reference)
        : Base(stack_reference)
      {}
  };

} // namespace adl

using adl::table;

template <class Base>
struct value_wrapper_traits<adl::table<Base> >
  : value_wrapper_traits<Base>
{
    static bool check(lua_State* L, int idx)
    {
        return value_wrapper_traits<Base>::check(L, idx) &&
            lua_istable(L, idx);
    }
};

inline object newtable(lua_State* interpreter)
{
    lua_newtable(interpreter);
    detail::stack_pop pop(interpreter, 1);
    return object(from_stack(interpreter, -1));
}

// this could be optimized by returning a proxy
inline object globals(lua_State* interpreter)
{
    lua_pushglobaltable(interpreter);
    detail::stack_pop pop(interpreter, 1);
    return object(from_stack(interpreter, -1));
}

// this could be optimized by returning a proxy
inline object registry(lua_State* interpreter)
{
    lua_pushvalue(interpreter, LUA_REGISTRYINDEX);
    detail::stack_pop pop(interpreter, 1);
    return object(from_stack(interpreter, -1));
}

template<class ValueWrapper, class K>
inline object gettable(ValueWrapper const& table, K const& key)
{
    lua_State* interpreter = value_wrapper_traits<ValueWrapper>::interpreter(
        table
    );

    value_wrapper_traits<ValueWrapper>::unwrap(interpreter, table);
    detail::stack_pop pop(interpreter, 2);
    detail::push(interpreter, key);
    lua_gettable(interpreter, -2);
    return object(from_stack(interpreter, -1));
}

template<class ValueWrapper, class K, class T>
inline void settable(ValueWrapper const& table, K const& key, T const& value)
{
    lua_State* interpreter = value_wrapper_traits<ValueWrapper>::interpreter(
        table
    );

    // TODO: Exception safe?
    
    value_wrapper_traits<ValueWrapper>::unwrap(interpreter, table);
    detail::stack_pop pop(interpreter, 1);
    detail::push(interpreter, key);
    detail::push(interpreter, value);
    lua_settable(interpreter, -3);
}

template<class ValueWrapper, class K>
inline object rawget(ValueWrapper const& table, K const& key)
{
    lua_State* interpreter = value_wrapper_traits<ValueWrapper>::interpreter(
        table
    );

    value_wrapper_traits<ValueWrapper>::unwrap(interpreter, table);
    detail::stack_pop pop(interpreter, 2);
    detail::push(interpreter, key);
    lua_rawget(interpreter, -2);
    return object(from_stack(interpreter, -1));
}

template<class ValueWrapper, class K, class T>
inline void rawset(ValueWrapper const& table, K const& key, T const& value)
{
    lua_State* interpreter = value_wrapper_traits<ValueWrapper>::interpreter(
        table
    );

    // TODO: Exception safe?
    
    value_wrapper_traits<ValueWrapper>::unwrap(interpreter, table);
    detail::stack_pop pop(interpreter, 1);
    detail::push(interpreter, key);
    detail::push(interpreter, value);
    lua_rawset(interpreter, -3);
}

template<class ValueWrapper>
inline int type(ValueWrapper const& value)
{
    lua_State* interpreter = value_wrapper_traits<ValueWrapper>::interpreter(
        value
    );

    value_wrapper_traits<ValueWrapper>::unwrap(interpreter, value);
    detail::stack_pop pop(interpreter, 1);
    return lua_type(interpreter, -1);
}

template <class ValueWrapper>
inline object getmetatable(ValueWrapper const& obj)
{
    lua_State* interpreter = value_wrapper_traits<ValueWrapper>::interpreter(
        obj
    );

    value_wrapper_traits<ValueWrapper>::unwrap(interpreter, obj);
    detail::stack_pop pop(interpreter, 2);
    lua_getmetatable(interpreter, -1);
    return object(from_stack(interpreter, -1));
}

template <class ValueWrapper1, class ValueWrapper2>
inline void setmetatable(
    ValueWrapper1 const& obj, ValueWrapper2 const& metatable)
{
    lua_State* interpreter = value_wrapper_traits<ValueWrapper1>::interpreter(
        obj
    );

    value_wrapper_traits<ValueWrapper1>::unwrap(interpreter, obj);
    detail::stack_pop pop(interpreter, 1);
    value_wrapper_traits<ValueWrapper2>::unwrap(interpreter, metatable);
    lua_setmetatable(interpreter, -2);
}

template <class ValueWrapper>
inline lua_CFunction tocfunction(ValueWrapper const& value)
{
    lua_State* interpreter = value_wrapper_traits<ValueWrapper>::interpreter(
        value
    );

    value_wrapper_traits<ValueWrapper>::unwrap(interpreter, value);
    detail::stack_pop pop(interpreter, 1);
    return lua_tocfunction(interpreter, -1);
}

template <class T, class ValueWrapper>
inline T* touserdata(ValueWrapper const& value)
{
    lua_State* interpreter = value_wrapper_traits<ValueWrapper>::interpreter(
        value
    );

    value_wrapper_traits<ValueWrapper>::unwrap(interpreter, value);
    detail::stack_pop pop(interpreter, 1);
    return static_cast<T*>(lua_touserdata(interpreter, -1));
}

template <class ValueWrapper>
inline object getupvalue(ValueWrapper const& value, int index)
{
    lua_State* interpreter = value_wrapper_traits<ValueWrapper>::interpreter(
        value
    );

    value_wrapper_traits<ValueWrapper>::unwrap(interpreter, value);
    detail::stack_pop pop(interpreter, 2);
    lua_getupvalue(interpreter, -1, index);
    return object(from_stack(interpreter, -1));
}

template <class ValueWrapper1, class ValueWrapper2>
inline void setupvalue(
    ValueWrapper1 const& function, int index, ValueWrapper2 const& value)
{
    lua_State* interpreter = value_wrapper_traits<ValueWrapper1>::interpreter(
        function
    );

    value_wrapper_traits<ValueWrapper1>::unwrap(interpreter, function);
    detail::stack_pop pop(interpreter, 1);
    value_wrapper_traits<ValueWrapper2>::unwrap(interpreter, value);
    lua_setupvalue(interpreter, -2, index);
}

template <class GetValueWrapper>
object property(GetValueWrapper const& get)
{
    lua_State* interpreter = value_wrapper_traits<GetValueWrapper>::interpreter(
        get
    );

    value_wrapper_traits<GetValueWrapper>::unwrap(interpreter, get);
    lua_pushnil(interpreter);

    lua_pushcclosure(interpreter, &detail::property_tag, 2);
    detail::stack_pop pop(interpreter, 1);

    return object(from_stack(interpreter, -1));
}

template <class GetValueWrapper, class SetValueWrapper>
object property(GetValueWrapper const& get, SetValueWrapper const& set)
{
    lua_State* interpreter = value_wrapper_traits<GetValueWrapper>::interpreter(
        get
    );

    value_wrapper_traits<GetValueWrapper>::unwrap(interpreter, get);
    value_wrapper_traits<SetValueWrapper>::unwrap(interpreter, set);

    lua_pushcclosure(interpreter, &detail::property_tag, 2);
    detail::stack_pop pop(interpreter, 1);

    return object(from_stack(interpreter, -1));

}


} // namespace luabind

#if LUA_VERSION_NUM < 502
# undef lua_compare
# undef LUA_OPEQ
# undef LUA_OPLT
# undef lua_rawlen
# undef lua_pushglobaltable
#endif

#endif // LUABIND_OBJECT_050419_HPP