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
// Copyright 2013-2016, The Gtk-rs Project Developers.
// See the COPYRIGHT file at the top-level directory of this distribution.
// Licensed under the MIT license, see the LICENSE file or <http://opensource.org/licenses/MIT>

//! `Value` binding and helper traits.
//!
//! The type of a [`Value`](struct.Value.html) is dynamic in that it generally
//! isn't known at compile time but once created a `Value` can't change its
//! type.
//!
//! [`TypedValue`](struct.TypedValue.html) has a statically known type and
//! dereferences to `Value` so it can be used everywhere `Value` references are
//! accepted.
//!
//! [`SendValue`](struct.SendValue.html) is a version of [`Value`](struct.Value.html)
//! that can only store types that implement `Send` and as such implements `Send` itself. It
//! dereferences to `Value` so it can be used everywhere `Value` references are accepted.
//!
//! Supported types are `bool`, `i8`, `u8`, `i32`, `u32`, `i64`, `u64`, `f32`,
//! `f64`, `String` and objects (`T: IsA<Object>`).
//!
//! In addition any `'static` type implementing `Any` and `Clone` can be stored in a
//! [`Value`](struct.Value.html) by using [`AnyValue`](struct.AnyValue.html) or
//! [`AnySendValue`](struct.AnySendValue.html).
//!
//! # Examples
//!
//! ```
//! use glib::prelude::*; // or `use gtk::prelude::*;`
//! use glib::{TypedValue, Value};
//!
//! // Value and TypedValue implement From<&i32>, From<&str>
//! // and From<Option<&str>>. Another option is the `ToValue` trait.
//! let mut num = 10.to_value();
//! let mut hello = Value::from("Hello!");
//! let none: Option<&str> = None;
//! let str_none = Value::from(none.clone());
//! let typed_str_none = TypedValue::from(none);
//!
//! // `is` tests the type of the value.
//! assert!(num.is::<i32>());
//! assert!(hello.is::<String>());
//!
//! // `get` tries to get a value of specific type and returns None
//! // if the type doesn't match or the value is None.
//! assert_eq!(num.get(), Some(10));
//! assert_eq!(num.get::<String>(), None);
//! assert_eq!(hello.get(), Some(String::from("Hello!")));
//! assert_eq!(hello.get::<String>(), Some(String::from("Hello!")));
//! assert_eq!(str_none.get::<String>(), None);
//!
//! // `typed` tries to convert a `Value` to `TypedValue`.
//! let mut typed_num = num.downcast::<i32>().unwrap();
//! let mut typed_hello = hello.downcast::<String>().unwrap();
//!
//! // `str_none` is not an `i32`
//! assert!(str_none.downcast::<i32>().is_err());
//!
//! // `get`
//! assert!(typed_hello.get().unwrap() == "Hello!");
//! assert!(typed_str_none.get() == None);
//!
//! // Numeric types can't have value `None`, `get` always returns `Some`.
//! // Such types have `get_some`, which avoids unnecessary `unwrap`ping.
//! assert_eq!(typed_num.get().unwrap(), 10);
//! assert_eq!(typed_num.get_some(), 10);
//!
//! // `set_none` sets the value to `None` if the type supports it.
//! typed_hello.set_none();
//! assert!(typed_hello.get().is_none());
//!
//! // `set` takes an optional reference for types that support `None`.
//! typed_hello.set(Some("Hello again!"));
//! assert!(typed_hello.get().unwrap() == "Hello again!");
//!
//! // `set_some` is the only setter for types that don't support `None`.
//! typed_num.set_some(&20);
//! assert_eq!(typed_num.get_some(), 20);
//! ```

use std::borrow::Borrow;
use std::fmt;
use std::marker::PhantomData;
use std::mem;
use std::ops::Deref;
use std::ffi::CStr;
use std::ptr;
use std::any::Any;
use std::sync::Arc;
use libc::{c_char, c_void};

use translate::*;
use types::{StaticType, Type};

use ffi as glib_ffi;
use gobject_ffi;

/// A generic value capable of carrying various types.
///
/// Once created the type of the value can't be changed.
///
/// Some types (e.g. `String` and objects) support `None` values while others
/// (e.g. numeric types) don't.
///
/// `Value` does not implement the `Send` trait, but [`SendValue`](struct.SendValue.html) can be
/// used instead.
///
/// See the [module documentation](index.html) for more details.
// TODO: Should use impl !Send for Value {} once stable
#[repr(C)]
pub struct Value(gobject_ffi::GValue, PhantomData<*const c_void>);

impl Value {
    /// Creates a new `Value` that is initialized with `type_`
    pub fn from_type(type_: Type) -> Self {
        unsafe {
            assert_eq!(gobject_ffi::g_type_check_is_value_type(type_.to_glib()), glib_ffi::GTRUE);
            let mut value = Value::uninitialized();
            gobject_ffi::g_value_init(value.to_glib_none_mut().0, type_.to_glib());
            value
        }
    }

    /// Tries to downcast to a `TypedValue`.
    ///
    /// Returns `Ok(TypedValue<T>)` if the value carries a type corresponding
    /// to `T` and `Err(self)` otherwise.
    pub fn downcast<'a, T: FromValueOptional<'a> + SetValue>(self) -> Result<TypedValue<T>, Self> {
        unsafe {
            let ok = from_glib(
                gobject_ffi::g_type_check_value_holds(mut_override(self.to_glib_none().0),
                    T::static_type().to_glib()));
            if ok {
                Ok(TypedValue(self, PhantomData))
            }
            else {
                Err(self)
            }
        }
    }

    /// Tries to downcast to a `&TypedValue`.
    ///
    /// Returns `Some(&TypedValue<T>)` if the value carries a type corresponding
    /// to `T` and `None` otherwise.
    pub fn downcast_ref<'a, T: FromValueOptional<'a> + SetValue>(&self) -> Option<&TypedValue<T>> {
        unsafe {
            let ok = from_glib(
                gobject_ffi::g_type_check_value_holds(mut_override(self.to_glib_none().0),
                    T::static_type().to_glib()));
            if ok {
                // This transmute is safe because Value and TypedValue have the same
                // representation: the only difference is the zero-sized phantom data
                Some(mem::transmute(self))
            }
            else {
                None
            }
        }
    }

    /// Tries to get a value of type `T`.
    ///
    /// Returns `Some` if the type is correct and the value is not `None`.
    ///
    /// This function doesn't distinguish between type mismatches and correctly
    /// typed `None` values. Use `downcast` or `is` for that.
    pub fn get<'a, T: FromValueOptional<'a>>(&'a self) -> Option<T> {
        unsafe {
           let ok = from_glib(
               gobject_ffi::g_type_check_value_holds(mut_override(self.to_glib_none().0),
                   T::static_type().to_glib()));
           if ok {
               T::from_value_optional(self)
           }
           else {
               None
           }
        }
    }

    /// Returns `true` if the type of the value corresponds to `T`
    /// or is a sub-type of `T`.
    #[inline]
    pub fn is<'a, T: FromValueOptional<'a> + SetValue>(&self) -> bool {
        self.type_().is_a(&T::static_type())
    }

    /// Returns the type of the value.
    pub fn type_(&self) -> Type {
        from_glib(self.0.g_type)
    }

    /// Returns whether `Value`s of type `src` can be transformed to type `dst`.
    pub fn type_transformable(src: Type, dst: Type) -> bool {
        unsafe {
            from_glib(gobject_ffi::g_value_type_transformable(src.to_glib(), dst.to_glib()))
        }
    }

    #[doc(hidden)]
    pub fn into_raw(mut self) -> gobject_ffi::GValue {
        unsafe {
            let ret = mem::replace(&mut self.0, mem::uninitialized());
            mem::forget(self);
            ret
        }
    }

    pub fn try_into_send_value<'a, T: Send + FromValueOptional<'a> + SetValue>(self) -> Result<SendValue, Self> {
        self.downcast::<T>().map(TypedValue::into_send_value)
    }
}

impl Clone for Value {
    fn clone(&self) -> Self {
        unsafe {
            let mut ret = Value::from_type(from_glib(self.0.g_type));
            gobject_ffi::g_value_copy(self.to_glib_none().0, ret.to_glib_none_mut().0);
            ret
        }
    }
}

impl Drop for Value {
    fn drop(&mut self) {
        // Before GLib 2.48, unsetting a zeroed GValue would give critical warnings
        // https://bugzilla.gnome.org/show_bug.cgi?id=755766
        if self.type_() != Type::Invalid {
            unsafe { gobject_ffi::g_value_unset(self.to_glib_none_mut().0) }
        }
    }
}

impl fmt::Debug for Value {
    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        unsafe {
            let s: String = from_glib_full(
                gobject_ffi::g_strdup_value_contents(self.to_glib_none().0));

            f.debug_tuple("Value")
                .field(&s)
                .finish()
        }
    }
}

impl<'a, T: ?Sized + SetValueOptional> From<Option<&'a T>> for Value {
    #[inline]
    fn from(value: Option<&'a T>) -> Self {
        value.to_value()
    }
}

impl<'a, T: ?Sized + SetValue> From<&'a T> for Value {
    #[inline]
    fn from(value: &'a T) -> Self {
        value.to_value()
    }
}

impl<T> From<TypedValue<T>> for Value {
    fn from(value: TypedValue<T>) -> Self {
        value.0
    }
}

impl From<SendValue> for Value {
    fn from(value: SendValue) -> Self {
        value.0
    }
}

impl Uninitialized for Value {
    unsafe fn uninitialized() -> Value {
        Value(mem::zeroed(), PhantomData)
    }
}

impl<'a> ToGlibPtr<'a, *const gobject_ffi::GValue> for Value {
    type Storage = &'a Value;

    fn to_glib_none(&'a self) -> Stash<'a, *const gobject_ffi::GValue, Self> {
        Stash(&self.0, self)
    }
}

impl<'a> ToGlibPtrMut<'a, *mut gobject_ffi::GValue> for Value {
    type Storage = &'a mut Value;

    fn to_glib_none_mut(&'a mut self) -> StashMut<'a, *mut gobject_ffi::GValue, Self> {
        StashMut(&mut self.0, self)
    }
}

impl<'a> ToGlibPtr<'a, *mut gobject_ffi::GValue> for &'a [&'a ToValue] {
    type Storage = ValueArray;

    fn to_glib_none(&'a self) -> Stash<'a, *mut gobject_ffi::GValue, Self> {
        let mut values: Vec<gobject_ffi::GValue> = self.iter()
            .map(|v| v.to_value().into_raw())
            .collect();
        Stash(values.as_mut_ptr(), ValueArray(values))
    }
}

impl<'a> ToGlibContainerFromSlice<'a, *mut gobject_ffi::GValue> for &'a Value {
    type Storage = &'a [&'a Value];

    fn to_glib_none_from_slice(t: &'a [&'a Value]) -> (*mut gobject_ffi::GValue, &'a [&'a Value]) {
        (t.as_ptr() as *mut gobject_ffi::GValue, t)
    }

    fn to_glib_container_from_slice(t: &'a [&'a Value]) -> (*mut gobject_ffi::GValue, &'a [&'a Value]) {
        if t.is_empty() {
            return (ptr::null_mut(), t);
        }

        unsafe {
            let res = glib_ffi::g_malloc(mem::size_of::<gobject_ffi::GValue>() * t.len()) as *mut gobject_ffi::GValue;
            ptr::copy_nonoverlapping(t.as_ptr() as *const gobject_ffi::GValue, res, t.len());
            (res, t)
        }
    }

    fn to_glib_full_from_slice(t: &[&'a Value]) -> *mut gobject_ffi::GValue {
        if t.is_empty() {
            return ptr::null_mut();
        }

        unsafe {
            let res = glib_ffi::g_malloc(mem::size_of::<gobject_ffi::GValue>() * t.len()) as *mut gobject_ffi::GValue;
            for (i, v) in t.iter().enumerate() {
                gobject_ffi::g_value_init(res.offset(i as isize), v.type_().to_glib());
                gobject_ffi::g_value_copy(v.to_glib_none().0, res.offset(i as isize));
            }
            res
        }
    }
}

impl<'a> ToGlibContainerFromSlice<'a, *const gobject_ffi::GValue> for &'a Value {
    type Storage = &'a [&'a Value];

    fn to_glib_none_from_slice(t: &'a [&'a Value]) -> (*const gobject_ffi::GValue, &'a [&'a Value]) {
        let (ptr, storage) = ToGlibContainerFromSlice::<'a, *mut gobject_ffi::GValue>::to_glib_none_from_slice(t);
        (ptr as *const _, storage)
    }

    fn to_glib_container_from_slice(_: &'a [&'a Value]) -> (*const gobject_ffi::GValue, &'a [&'a Value]) {
        unimplemented!()
    }

    fn to_glib_full_from_slice(_: &[&'a Value]) -> *const gobject_ffi::GValue {
        unimplemented!()
    }
}

macro_rules! from_glib {
    ($name:ident, $wrap:expr) => {
        impl FromGlibPtrNone<*const gobject_ffi::GValue> for $name {
            unsafe fn from_glib_none(ptr: *const gobject_ffi::GValue) -> Self {
                let mut ret = Value::from_type(from_glib((*ptr).g_type));
                gobject_ffi::g_value_copy(ptr, ret.to_glib_none_mut().0);
                $wrap(ret)
            }
        }

        impl FromGlibPtrNone<*mut gobject_ffi::GValue> for $name {
            unsafe fn from_glib_none(ptr: *mut gobject_ffi::GValue) -> Self {
                from_glib_none(ptr as *const _)
            }
        }

        impl FromGlibPtrFull<*mut gobject_ffi::GValue> for $name {
            unsafe fn from_glib_full(ptr: *mut gobject_ffi::GValue) -> Self {
                let mut ret = Value::uninitialized();
                ptr::swap(&mut ret.0, ptr);
                glib_ffi::g_free(ptr as *mut c_void);
                $wrap(ret)
            }
        }

        impl FromGlibContainerAsVec<*mut gobject_ffi::GValue, *mut *mut gobject_ffi::GValue> for $name {
            unsafe fn from_glib_none_num_as_vec(ptr: *mut *mut gobject_ffi::GValue, num: usize) -> Vec<Self> {
                if num == 0 || ptr.is_null() {
                    return Vec::new();
                }

                let mut res = Vec::with_capacity(num);
                for i in 0..num {
                    res.push(from_glib_none(ptr::read(ptr.offset(i as isize))));
                }
                res
            }

            unsafe fn from_glib_container_num_as_vec(ptr: *mut *mut gobject_ffi::GValue, num: usize) -> Vec<Self> {
                let res = FromGlibContainerAsVec::from_glib_none_num_as_vec(ptr, num);
                glib_ffi::g_free(ptr as *mut _);
                res
            }

            unsafe fn from_glib_full_num_as_vec(ptr: *mut *mut gobject_ffi::GValue, num: usize) -> Vec<Self> {
                if num == 0 || ptr.is_null() {
                    return Vec::new();
                }

                let mut res = Vec::with_capacity(num);
                for i in 0..num {
                    res.push(from_glib_full(ptr::read(ptr.offset(i as isize))));
                }
                glib_ffi::g_free(ptr as *mut _);
                res
            }
        }

        impl FromGlibPtrArrayContainerAsVec<*mut gobject_ffi::GValue, *mut *mut gobject_ffi::GValue> for $name {
            unsafe fn from_glib_none_as_vec(ptr: *mut *mut gobject_ffi::GValue) -> Vec<Self> {
                FromGlibContainerAsVec::from_glib_none_num_as_vec(ptr, c_ptr_array_len(ptr))
            }

            unsafe fn from_glib_container_as_vec(ptr: *mut *mut gobject_ffi::GValue) -> Vec<Self> {
                FromGlibContainerAsVec::from_glib_container_num_as_vec(ptr, c_ptr_array_len(ptr))
            }

            unsafe fn from_glib_full_as_vec(ptr: *mut *mut gobject_ffi::GValue) -> Vec<Self> {
                FromGlibContainerAsVec::from_glib_full_num_as_vec(ptr, c_ptr_array_len(ptr))
            }
        }

        impl FromGlibContainerAsVec<*mut gobject_ffi::GValue, *const *mut gobject_ffi::GValue> for $name {
            unsafe fn from_glib_none_num_as_vec(ptr: *const *mut gobject_ffi::GValue, num: usize) -> Vec<Self> {
                FromGlibContainerAsVec::from_glib_none_num_as_vec(ptr as *mut *mut _, num)
            }

            unsafe fn from_glib_container_num_as_vec(_: *const *mut gobject_ffi::GValue, _: usize) -> Vec<Self> {
                // Can't free a *const
                unimplemented!()
            }

            unsafe fn from_glib_full_num_as_vec(_: *const *mut gobject_ffi::GValue, _: usize) -> Vec<Self> {
                // Can't free a *const
                unimplemented!()
            }
        }

        impl FromGlibPtrArrayContainerAsVec<*mut gobject_ffi::GValue, *const *mut gobject_ffi::GValue> for $name {
            unsafe fn from_glib_none_as_vec(ptr: *const *mut gobject_ffi::GValue) -> Vec<Self> {
                FromGlibPtrArrayContainerAsVec::from_glib_none_as_vec(ptr as *mut *mut _)
            }

            unsafe fn from_glib_container_as_vec(_: *const *mut gobject_ffi::GValue) -> Vec<Self> {
                // Can't free a *const
                unimplemented!()
            }

            unsafe fn from_glib_full_as_vec(_: *const *mut gobject_ffi::GValue) -> Vec<Self> {
                // Can't free a *const
                unimplemented!()
            }
        }
    }
}

from_glib!(Value, |v| v);

pub struct ValueArray(Vec<gobject_ffi::GValue>);

impl Drop for ValueArray {
    fn drop(&mut self) {
        unsafe {
            for value in &mut self.0 {
                // Before GLib 2.48, unsetting a zeroed GValue would give critical warnings
                // https://bugzilla.gnome.org/show_bug.cgi?id=755766
                if value.g_type != gobject_ffi::G_TYPE_INVALID {
                    gobject_ffi::g_value_unset(value);
                }
            }
        }
    }
}

/// A statically typed [`Value`](struct.Value.html).
///
/// It dereferences to `Value` and can be used everywhere `Value` references are
/// accepted.
///
/// See the [module documentation](index.html) for more details.
#[derive(Clone)]
#[repr(C)]
pub struct TypedValue<T>(Value, PhantomData<*const T>);

impl<'a, T: FromValueOptional<'a> + SetValue> TypedValue<T> {
    /// Returns the value.
    ///
    /// Types that don't support a `None` value always return `Some`. See
    /// `get_some`.
    pub fn get(&'a self) -> Option<T> {
        unsafe { T::from_value_optional(self) }
    }

    /// Returns the value.
    ///
    /// This method is only available for types that don't support a `None`
    /// value.
    pub fn get_some(&'a self) -> T where T: FromValue<'a> {
        unsafe { T::from_value(self) }
    }

    /// Sets the value.
    ///
    /// This method is only available for types that support a `None` value.
    pub fn set<U: ?Sized + SetValueOptional>(&mut self, value: Option<&U>) where T: Borrow<U> {
        unsafe { SetValueOptional::set_value_optional(&mut self.0, value) }
    }

    /// Sets the value to `None`.
    ///
    /// This method is only available for types that support a `None` value.
    pub fn set_none(&mut self) where T: SetValueOptional {
        unsafe { T::set_value_optional(&mut self.0, None) }
    }

    /// Sets the value.
    pub fn set_some<U: ?Sized + SetValue>(&mut self, value: &U) where T: Borrow<U> {
        unsafe { SetValue::set_value(&mut self.0, value) }
    }
}

impl<T> fmt::Debug for TypedValue<T> {
    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        f.debug_tuple("TypedValue")
            .field(&self.0)
            .finish()
    }
}

impl<'a, T: FromValueOptional<'a> + SetValue + Send> TypedValue<T> {
    pub fn into_send_value(self) -> SendValue {
        SendValue(self.0)
    }
}

impl<T> Deref for TypedValue<T> {
    type Target = Value;

    fn deref(&self) -> &Value {
        &self.0
    }
}

impl<'a, T: FromValueOptional<'a> + SetValueOptional> From<Option<&'a T>> for TypedValue<T> {
    fn from(value: Option<&'a T>) -> Self {
        TypedValue(Value::from(value), PhantomData)
    }
}

impl<'a, T: FromValueOptional<'a> + SetValue> From<&'a T> for TypedValue<T> {
    fn from(value: &'a T) -> Self {
        TypedValue(Value::from(value), PhantomData)
    }
}

impl<'a> From<Option<&'a str>> for TypedValue<String> {
    fn from(value: Option<&'a str>) -> Self {
        TypedValue(Value::from(value), PhantomData)
    }
}

impl<'a> From<&'a str> for TypedValue<String> {
    fn from(value: &'a str) -> Self {
        TypedValue(Value::from(value), PhantomData)
    }
}

impl<'a> From<TypedValue<&'a str>> for TypedValue<String> {
    fn from(value: TypedValue<&str>) -> Self {
        TypedValue(value.0, PhantomData)
    }
}

impl<'a> From<TypedValue<String>> for TypedValue<&'a str> {
    fn from(value: TypedValue<String>) -> Self {
        TypedValue(value.0, PhantomData)
    }
}

impl<'a, T: 'a> ToGlibPtrMut<'a, *mut gobject_ffi::GValue> for TypedValue<T> {
    type Storage = &'a mut TypedValue<T>;

    fn to_glib_none_mut(&'a mut self) -> StashMut<'a, *mut gobject_ffi::GValue, Self> {
        StashMut(&mut (self.0).0, self)
    }
}

/// Converts to `Value`.
pub trait ToValue {
    /// Returns a `Value` clone of `self`.
    fn to_value(&self) -> Value;

    /// Returns the type identifer of `self`.
    ///
    /// This is the type of the value to be returned by `to_value`.
    fn to_value_type(&self) -> Type;
}

impl<T: SetValueOptional> ToValue for Option<T> {
    fn to_value(&self) -> Value {
        unsafe {
            let mut ret = Value::from_type(T::static_type());
            T::set_value_optional(&mut ret, self.as_ref());
            ret
        }
    }

    #[inline]
    fn to_value_type(&self) -> Type {
        T::static_type()
    }
}

impl<T: ?Sized + SetValue> ToValue for T {
    fn to_value(&self) -> Value {
        unsafe {
            let mut ret = Value::from_type(T::static_type());
            T::set_value(&mut ret, self);
            ret
        }
    }

    #[inline]
    fn to_value_type(&self) -> Type {
        T::static_type()
    }
}

impl ToValue for Value {
    fn to_value(&self) -> Value {
        self.clone()
    }

    fn to_value_type(&self) -> Type {
        self.type_()
    }
}

/// A version of [`Value`](struct.Value.html) for storing `Send` types, that implements Send
/// itself.
///
/// See the [module documentation](index.html) for more details.
#[derive(Clone)]
#[repr(C)]
pub struct SendValue(Value);
unsafe impl Send for SendValue {}

impl SendValue {
    /// Tries to downcast to a `TypedValue`.
    ///
    /// Returns `Ok(TypedValue<T>)` if the value carries a type corresponding
    /// to `T` and `Err(self)` otherwise.
    pub fn downcast<'a, T: FromValueOptional<'a> + SetValue + Send>(self) -> Result<TypedValue<T>, Self> {
        self.0.downcast().map_err(SendValue)
    }

    /// Tries to downcast to a `&TypedValue`.
    ///
    /// Returns `Some(&TypedValue<T>)` if the value carries a type corresponding
    /// to `T` and `None` otherwise.
    pub fn downcast_ref<'a, T: FromValueOptional<'a> + SetValue>(&self) -> Option<&TypedValue<T>> {
        unsafe {
            let ok = from_glib(
                gobject_ffi::g_type_check_value_holds(mut_override(self.to_glib_none().0),
                    T::static_type().to_glib()));
            if ok {
                // This transmute is safe because Value and TypedValue have the same
                // representation: the only difference is the zero-sized phantom data
                Some(mem::transmute(self))
            }
            else {
                None
            }
        }
    }

    #[doc(hidden)]
    pub fn into_raw(self) -> gobject_ffi::GValue {
        self.0.into_raw()
    }
}

impl fmt::Debug for SendValue {
    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        f.debug_tuple("SendValue")
            .field(&self.0)
            .finish()
    }
}

impl Deref for SendValue {
    type Target = Value;

    fn deref(&self) -> &Value {
        &self.0
    }
}

impl<'a, T: ?Sized + SetValueOptional + Send> From<Option<&'a T>> for SendValue {
    #[inline]
    fn from(value: Option<&'a T>) -> Self {
        SendValue(value.to_value())
    }
}

impl<'a, T: ?Sized + SetValue + Send> From<&'a T> for SendValue {
    #[inline]
    fn from(value: &'a T) -> Self {
        SendValue(value.to_value())
    }
}

impl<T: Send> From<TypedValue<T>> for SendValue {
    fn from(value: TypedValue<T>) -> Self {
        SendValue(value.0)
    }
}

from_glib!(SendValue, SendValue);

impl<'a> ToGlibPtrMut<'a, *mut gobject_ffi::GValue> for SendValue {
    type Storage = &'a mut SendValue;

    fn to_glib_none_mut(&'a mut self) -> StashMut<'a, *mut gobject_ffi::GValue, Self> {
        StashMut(&mut (self.0).0, self)
    }
}

/// Converts to `SendValue`.
pub trait ToSendValue: Send + ToValue {
    /// Returns a `SendValue` clone of `self`.
    fn to_send_value(&self) -> SendValue;
}

impl<T: SetValueOptional + Send + ToValue> ToSendValue for Option<T> {
    fn to_send_value(&self) -> SendValue {
        SendValue(self.to_value())
    }
}

impl<T: ?Sized + SetValue + Send + ToValue> ToSendValue for T {
    fn to_send_value(&self) -> SendValue {
        SendValue(self.to_value())
    }
}

impl ToSendValue for SendValue {
    fn to_send_value(&self) -> SendValue {
        self.clone()
    }
}

impl ToValue for SendValue {
    fn to_value(&self) -> Value {
        self.0.clone()
    }

    fn to_value_type(&self) -> Type {
        self.type_()
    }
}

/// Extracts a value.
///
/// Types that don't support a `None` value always return `Some`.
pub trait FromValueOptional<'a>: StaticType + Sized {
    unsafe fn from_value_optional(&'a Value) -> Option<Self>;
}

/// Extracts a value.
///
/// Only implemented for types that don't support a `None` value.
pub trait FromValue<'a>: FromValueOptional<'a> {
    unsafe fn from_value(&'a Value) -> Self;
}

/// Sets a value.
///
/// Only implemented for types that support a `None` value.
pub trait SetValueOptional: SetValue {
    unsafe fn set_value_optional(&mut Value, Option<&Self>);
}

/// Sets a value.
pub trait SetValue: StaticType {
    unsafe fn set_value(&mut Value, &Self);
}

impl<'a> FromValueOptional<'a> for String {
    unsafe fn from_value_optional(value: &'a Value) -> Option<Self> {
        from_glib_none(gobject_ffi::g_value_get_string(value.to_glib_none().0))
    }
}

impl<'a> FromValueOptional<'a> for &'a str {
    unsafe fn from_value_optional(value: &'a Value) -> Option<Self> {
        let cstr = gobject_ffi::g_value_get_string(value.to_glib_none().0);
        if cstr.is_null() {
            None
        } else {
            CStr::from_ptr(cstr).to_str().ok()
        }
    }
}

impl SetValue for str {
    unsafe fn set_value(value: &mut Value, this: &Self) {
        gobject_ffi::g_value_take_string(value.to_glib_none_mut().0, this.to_glib_full())
    }
}

impl SetValueOptional for str {
    unsafe fn set_value_optional(value: &mut Value, this: Option<&Self>) {
        gobject_ffi::g_value_take_string(value.to_glib_none_mut().0, this.to_glib_full())
    }
}

impl<'a> FromValueOptional<'a> for Vec<String> {
    unsafe fn from_value_optional(value: &'a Value) -> Option<Self> {
        Some(<Vec<String> as FromValue>::from_value(value))
    }
}

impl<'a> FromValue<'a> for Vec<String> {
    unsafe fn from_value(value: &'a Value) -> Self {
        let ptr = gobject_ffi::g_value_get_boxed(value.to_glib_none().0) as *const *const c_char;
        FromGlibPtrContainer::from_glib_none(ptr)
    }
}

impl<'a> SetValue for [&'a str] {
    unsafe fn set_value(value: &mut Value, this: &Self) {
        let ptr: *mut *mut c_char = this.to_glib_full();
        gobject_ffi::g_value_take_boxed(value.to_glib_none_mut().0, ptr as *const c_void)
    }
}

impl<'a> SetValueOptional for [&'a str] {
    unsafe fn set_value_optional(value: &mut Value, this: Option<&Self>) {
        let ptr: *mut *mut c_char = this.to_glib_full();
        gobject_ffi::g_value_take_boxed(value.to_glib_none_mut().0, ptr as *const c_void)
    }
}

impl SetValue for Vec<String> {
    unsafe fn set_value(value: &mut Value, this: &Self) {
        let ptr: *mut *mut c_char = this.to_glib_full();
        gobject_ffi::g_value_take_boxed(value.to_glib_none_mut().0, ptr as *const c_void)
    }
}

impl SetValueOptional for Vec<String> {
    unsafe fn set_value_optional(value: &mut Value, this: Option<&Self>) {
        let ptr: *mut *mut c_char = this.map(|v| v.to_glib_full()).unwrap_or(ptr::null_mut());
        gobject_ffi::g_value_take_boxed(value.to_glib_none_mut().0, ptr as *const c_void)
    }
}

impl<'a, T: ?Sized + SetValue> SetValue for &'a T {
    unsafe fn set_value(value: &mut Value, this: &Self) {
        SetValue::set_value(value, *this)
    }
}

impl<'a, T: ?Sized + SetValueOptional> SetValueOptional for &'a T {
    unsafe fn set_value_optional(value: &mut Value, this: Option<&Self>) {
        SetValueOptional::set_value_optional(value, this.map(|v| *v))
    }
}

impl SetValue for String {
    unsafe fn set_value(value: &mut Value, this: &Self) {
        gobject_ffi::g_value_take_string(value.to_glib_none_mut().0, this.to_glib_full())
    }
}

impl SetValueOptional for String {
    unsafe fn set_value_optional(value: &mut Value, this: Option<&Self>) {
        gobject_ffi::g_value_take_string(value.to_glib_none_mut().0, this.to_glib_full())
    }
}

impl<'a> FromValueOptional<'a> for bool {
    unsafe fn from_value_optional(value: &'a Value) -> Option<Self> {
        Some(from_glib(gobject_ffi::g_value_get_boolean(value.to_glib_none().0)))
    }
}

impl<'a> FromValue<'a> for bool {
    unsafe fn from_value(value: &'a Value) -> Self {
        from_glib(gobject_ffi::g_value_get_boolean(value.to_glib_none().0))
    }
}

impl SetValue for bool {
    unsafe fn set_value(value: &mut Value, this: &Self) {
        gobject_ffi::g_value_set_boolean(value.to_glib_none_mut().0, this.to_glib())
    }
}

macro_rules! numeric {
    ($name:ident, $get:ident, $set:ident) => {
        impl<'a> FromValueOptional<'a> for $name {
            unsafe fn from_value_optional(value: &'a Value) -> Option<Self> {
                Some(gobject_ffi::$get(value.to_glib_none().0))
            }
        }

        impl<'a> FromValue<'a> for $name {
            unsafe fn from_value(value: &'a Value) -> Self {
                gobject_ffi::$get(value.to_glib_none().0)
            }
        }

        impl SetValue for $name {
            unsafe fn set_value(value: &mut Value, this: &Self) {
                gobject_ffi::$set(value.to_glib_none_mut().0, *this)
            }
        }
    }
}

numeric!(i8, g_value_get_schar, g_value_set_schar);
numeric!(u8, g_value_get_uchar, g_value_set_uchar);
numeric!(i32, g_value_get_int, g_value_set_int);
numeric!(u32, g_value_get_uint, g_value_set_uint);
numeric!(i64, g_value_get_int64, g_value_set_int64);
numeric!(u64, g_value_get_uint64, g_value_set_uint64);
numeric!(f32, g_value_get_float, g_value_set_float);
numeric!(f64, g_value_get_double, g_value_set_double);

/// A container type that allows storing any `'static` type that implements `Any` and `Clone` to be
/// stored in a [`Value`](struct.Value.html).
///
/// See the [module documentation](index.html) for more details.
///
/// # Examples
///
/// ```
/// use glib::prelude::*; // or `use gtk::prelude::*;`
/// use glib::{AnyValue, Value};
///
/// // Store a Rust string inside a Value
/// let v = AnyValue::new(String::from("123")).to_value();
///
/// // Retrieve the Rust String from the the Value again
/// let any_v = v.get::<&AnyValue>()
///     .expect("Value did not actually contain an AnyValue");
/// assert_eq!(any_v.downcast_ref::<String>(), Some(&String::from("123")));
/// ```
pub struct AnyValue {
    val: Box<Any>,
    copy_fn: Arc<Fn(&Any) -> Box<Any> + Send + Sync + 'static>,
}

impl AnyValue {
    /// Create a new `AnyValue` from `val`
    pub fn new<T: Any + Clone + 'static>(val: T) -> Self {
        let val: Box<Any> = Box::new(val);
        let copy_fn = Arc::new(|val: &Any| {
            let copy = val.downcast_ref::<T>().expect("Can't cast Any to T").clone();
            let copy_box: Box<Any> = Box::new(copy);
            copy_box
        });

        Self { val, copy_fn }
    }

    /// Attempt the value to its concrete type.
    pub fn downcast<T: Any + Clone + 'static>(self) -> Result<T, Self> {
        let AnyValue { val, copy_fn } = self;
        val.downcast().map(|val| *val).map_err(|val| AnyValue { val, copy_fn })
    }

    unsafe extern "C" fn copy(v: *mut c_void) -> *mut c_void {
        let v = &*(v as *mut AnyValue);
        Box::into_raw(Box::new(v.clone())) as *mut c_void
    }

    unsafe extern "C" fn free(v: *mut c_void) {
        let _ = Box::from_raw(v as *mut AnyValue);
    }
}

impl Clone for AnyValue {
    fn clone(&self) -> Self {
        let val = (*self.copy_fn)(self.val.as_ref());
        Self {
            val,
            copy_fn: self.copy_fn.clone(),
        }
    }
}

impl fmt::Debug for AnyValue {
    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        f.debug_tuple("AnyValue")
            .finish()
    }
}

impl Deref for AnyValue {
    type Target = Any;

    fn deref(&self) -> &Any {
        &*self.val
    }
}

impl<'a> FromValueOptional<'a> for &'a AnyValue {
    unsafe fn from_value_optional(value: &'a Value) -> Option<Self> {
        let v = gobject_ffi::g_value_get_boxed(value.to_glib_none().0);
        if v.is_null() {
            None
        } else {
            Some(&*(v as *const AnyValue))
        }
    }
}

impl SetValue for AnyValue {
    unsafe fn set_value(value: &mut Value, this: &Self) {
        let this_ptr = Box::into_raw(Box::new(this.clone())) as *const c_void;
        gobject_ffi::g_value_take_boxed(value.to_glib_none_mut().0, this_ptr)
    }
}

/// A container type that allows storing any `'static` type that implements `Any`, `Clone` and
/// `Send` to be stored in a [`Value`](struct.Value.html) or [`SendValue`](struct.SendValue.html).
///
/// See the [module documentation](index.html) for more details and the
/// [`AnyValue`](struct.AnyValue.html) for a code example.
#[derive(Clone)]
pub struct AnySendValue(AnyValue);

unsafe impl Send for AnySendValue {}

impl AnySendValue {
    /// Create a new `AnySendValue` from `val`.
    pub fn new<T: Any + Clone + Send + 'static>(val: T) -> Self {
        AnySendValue(AnyValue::new(val))
    }

    /// Attempt the value to its concrete type.
    pub fn downcast<T: Any + Clone + Send + 'static>(self) -> Result<T, Self> {
        let AnySendValue(AnyValue { val, copy_fn }) = self;
        val.downcast().map(|val| *val).map_err(|val| AnySendValue(AnyValue { val, copy_fn }))
    }

    unsafe extern "C" fn copy(v: *mut c_void) -> *mut c_void {
        let v = &*(v as *mut AnySendValue);
        Box::into_raw(Box::new(v.clone())) as *mut c_void
    }

    unsafe extern "C" fn free(v: *mut c_void) {
        let _ = Box::from_raw(v as *mut AnySendValue);
    }
}

impl fmt::Debug for AnySendValue {
    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        f.debug_tuple("AnySendValue")
            .finish()
    }
}

impl Deref for AnySendValue {
    type Target = AnyValue;

    fn deref(&self) -> &AnyValue {
        &self.0
    }
}

macro_rules! any_value_get_type {
    ($name:ident, $name_templ:expr) => {
        impl StaticType for $name {
            fn static_type() -> Type {
                unsafe {
                    use std::sync::{Once, ONCE_INIT};
                    use std::ffi::CString;

                    static mut TYPE: glib_ffi::GType = gobject_ffi::G_TYPE_INVALID;
                    static ONCE: Once = ONCE_INIT;

                    ONCE.call_once(|| {
                        let type_name = {
                            let mut idx = 0;

                            // There might be multiple versions of glib-rs in this process
                            loop {
                                let type_name = CString::new(format!($name_templ, idx)).unwrap();
                                if gobject_ffi::g_type_from_name(type_name.as_ptr())
                                    == gobject_ffi::G_TYPE_INVALID
                                {
                                    break type_name;
                                }
                                idx += 1;
                            }
                        };

                        TYPE = gobject_ffi::g_boxed_type_register_static(
                            type_name.as_ptr(),
                            Some(mem::transmute($name::copy as *const c_void)),
                            Some(mem::transmute($name::free as *const c_void)),
                        );

                    });

                    from_glib(TYPE)
                }
            }
        }
    }
}

impl<'a> FromValueOptional<'a> for &'a AnySendValue {
    unsafe fn from_value_optional(value: &'a Value) -> Option<Self> {
        let v = gobject_ffi::g_value_get_boxed(value.to_glib_none().0);
        if v.is_null() {
            None
        } else {
            Some(&*(v as *const AnySendValue))
        }
    }
}

impl SetValue for AnySendValue {
    unsafe fn set_value(value: &mut Value, this: &Self) {
        let this_ptr = Box::into_raw(Box::new(this.clone())) as *const c_void;
        gobject_ffi::g_value_take_boxed(value.to_glib_none_mut().0, this_ptr)
    }
}

any_value_get_type!(AnyValue, "AnyValueRs-{}");
any_value_get_type!(AnySendValue, "AnySendValueRs-{}");

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_send_value() {
        use std::thread;

        let v = SendValue::from(&1i32);

        // Must compile, while it must fail with Value
        thread::spawn(move || drop(v)).join().unwrap();
    }

    #[test]
    fn test_any_value() {
        let v = AnyValue::new(String::from("123"));
        let v = v.to_value();

        let any_v = v.get::<&AnyValue>().cloned();
        assert!(any_v.is_some());
        let any_v = any_v.unwrap();
        let s = any_v.downcast_ref::<String>().map(|s| s.clone());
        assert_eq!(s, Some(String::from("123")));

        let v2 = v.clone();

        let s = any_v.downcast::<String>().unwrap();
        assert_eq!(s, String::from("123"));

        drop(v);

        let any_v = v2.get::<&AnyValue>().cloned();
        assert!(any_v.is_some());
        let any_v = any_v.unwrap();
        let s = any_v.downcast_ref::<String>().map(|s| s.clone());
        assert_eq!(s, Some(String::from("123")));
    }

    #[test]
    fn test_any_send_value() {
        let v = AnySendValue::new(String::from("123"));
        let v = v.to_send_value();

        let any_v = v.get::<&AnyValue>().cloned();
        assert!(any_v.is_none());

        let any_v = v.get::<&AnySendValue>().cloned();
        assert!(any_v.is_some());
        let any_v = any_v.unwrap();
        let s = any_v.downcast_ref::<String>().map(|s| s.clone());
        assert_eq!(s, Some(String::from("123")));

        let v2 = v.clone();

        let s = any_v.downcast::<String>().unwrap();
        assert_eq!(s, String::from("123"));
        drop(v);

        let any_v = v2.get::<&AnySendValue>().cloned();
        assert!(any_v.is_some());
        let any_v = any_v.unwrap();
        let s = any_v.downcast_ref::<String>().map(|s| s.clone());
        assert_eq!(s, Some(String::from("123")));

        // Must compile, while it must fail with AnyValue
        use std::thread;
        thread::spawn(move || drop(any_v)).join().unwrap();
    }

    #[test]
    fn test_strv() {
        let v = vec!["123", "456"].to_value();
        assert_eq!(v.get::<Vec<String>>(), Some(vec!["123".into(), "456".into()]));

        let v = vec![String::from("123"), String::from("456")].to_value();
        assert_eq!(v.get::<Vec<String>>(), Some(vec!["123".into(), "456".into()]));
    }
}