Files
addr2line
adler
ahash
aho_corasick
ansi_term
anyhow
arc_swap
arrayref
arrayvec
ascii
assert_matches
async_stream
async_stream_impl
async_trait
atty
auto_enums
auto_enums_core
auto_enums_derive
backoff
backtrace
base32
base64
bincode
bip39
bitflags
bitvec
blake3
block_buffer
block_padding
borsh
borsh_derive
borsh_derive_internal
borsh_schema_derive_internal
bs58
bstr
bv
byte_slice_cast
byte_unit
bytecount
byteorder
bytes
bzip2
bzip2_sys
cargo_build_bpf
cargo_metadata
cargo_platform
cargo_test_bpf
cast
cc
cfg_if
chrono
chrono_humanize
clap
colored
combine
console
const_fn
constant_time_eq
core_affinity
cpufeatures
crc32fast
criterion_stats
crossbeam_channel
crossbeam_deque
crossbeam_epoch
crossbeam_queue
crossbeam_utils
crunchy
crypto_mac
csv
csv_core
ctrlc
curve25519_dalek
dashmap
derivative
derive_more
derive_utils
dialoguer
digest
dir_diff
dirs_next
dirs_sys_next
dlopen
dlopen_derive
doc_comment
dtoa
ed25519
ed25519_dalek
either
encoding_rs
enum_iterator
enum_iterator_derive
env_logger
ethabi
ethbloom
ethereum
ethereum_types
evm
evm_bridge
evm_core
evm_gasometer
evm_rpc
evm_runtime
evm_state
evm_utils
failure
failure_derive
fake_simd
fast_math
fd_lock
filetime
fixed_hash
flate2
fnv
foreign_types
foreign_types_shared
form_urlencoded
fs_extra
futures
futures_channel
futures_core
futures_executor
futures_io
futures_macro
futures_sink
futures_task
futures_util
async_await
future
io
lock
sink
stream
task
gag
generic_array
gethostname
getrandom
gimli
globset
goauth
goblin
h2
half
hash256_std_hasher
hash32
hash_db
hashbrown
heck
hex
hidapi
histogram
hmac
hmac_drbg
http
http_body
httparse
httpdate
humantime
hyper
hyper_rustls
hyper_tls
idna
ieee754
impl_codec
impl_rlp
impl_serde
indexed
indexmap
indicatif
inflector
cases
camelcase
case
classcase
kebabcase
pascalcase
screamingsnakecase
sentencecase
snakecase
tablecase
titlecase
traincase
numbers
deordinalize
ordinalize
string
constants
deconstantize
demodulize
pluralize
singularize
suffix
foreignkey
input_buffer
instant
iovec
ipnet
itertools
itoa
jemalloc_ctl
jemalloc_sys
jemallocator
jobserver
jsonrpc_client_transports
jsonrpc_core
jsonrpc_core_client
jsonrpc_derive
jsonrpc_http_server
jsonrpc_pubsub
jsonrpc_server_utils
jsonrpc_ws_server
keccak
keccak_hash
keccak_hasher
kernel32
lazy_static
lazycell
libc
libloading
librocksdb_sys
linked_hash_map
lock_api
log
lru
matches
maybe_uninit
memchr
memmap2
memoffset
mime
mime_guess
miniz_oxide
mio
mio_extras
miow
native_tls
net2
nix
num_cpus
num_derive
num_enum
num_enum_derive
num_integer
num_traits
number_prefix
object
once_cell
opaque_debug
openssl
openssl_probe
openssl_sys
ouroboros
ouroboros_macro
parity_scale_codec
parity_scale_codec_derive
parity_ws
parking_lot
parking_lot_core
paste
paste_impl
paw
paw_attributes
paw_raw
pbkdf2
percent_encoding
pest
pickledb
pin_project
pin_project_lite
pin_utils
plain
ppv_lite86
pretty_hex
primitive_types
proc_macro2
proc_macro_crate
proc_macro_error
proc_macro_error_attr
proc_macro_hack
proc_macro_nested
prost
prost_derive
prost_types
quote
radium
rand
rand_chacha
rand_core
rand_isaac
raptorq
rayon
rayon_core
reed_solomon_erasure
regex
regex_automata
regex_syntax
remove_dir_all
reqwest
retain_mut
ring
ripemd160
rlp
rlp_derive
rocksdb
rpassword
rustc_demangle
rustc_hash
rustc_hex
rustls
rustversion
ryu
same_file
scopeguard
scroll
scroll_derive
sct
secp256k1
secp256k1_sys
semver
semver_parser
serde
serde_bytes
serde_cbor
serde_derive
serde_json
serde_urlencoded
serde_yaml
sha1
sha2
sha3
signal_hook
signal_hook_registry
signature
simpl
simple_logger
slab
smallvec
smpl_jwt
snafu
snafu_derive
socket2
solana_account_decoder
solana_accounts_bench
solana_banking_bench
solana_banks_client
solana_banks_interface
solana_banks_server
solana_bench_exchange
solana_bench_streamer
solana_bench_tps
solana_bench_tps_evm
solana_bpf_loader_program
solana_budget_program
solana_clap_utils
solana_cli
solana_cli_config
solana_cli_output
solana_client
solana_config_program
solana_core
solana_crate_features
solana_csv_to_validator_infos
solana_dos
solana_download_utils
solana_evm_loader_program
solana_exchange_program
solana_failure_program
solana_faucet
solana_frozen_abi
solana_frozen_abi_macro
solana_genesis
solana_ip_address
solana_ip_address_server
solana_ledger
solana_ledger_tool
solana_ledger_udev
solana_local_cluster
solana_log_analyzer
solana_logger
solana_measure
solana_merkle_root_bench
solana_merkle_tree
solana_metrics
solana_net_shaper
solana_net_utils
solana_noop_program
solana_notifier
solana_ownable
solana_perf
solana_poh_bench
solana_program
solana_program_test
solana_ramp_tps
solana_rayon_threadlimit
solana_rbpf
solana_remote_wallet
solana_runtime
solana_sdk
solana_sdk_macro
solana_secp256k1_program
solana_sleep_program
solana_stake_accounts
solana_stake_monitor
solana_stake_o_matic
solana_stake_program
solana_storage_bigtable
solana_storage_proto
solana_store_tool
solana_streamer
solana_sys_tuner
solana_tokens
solana_transaction_status
solana_upload_perf
solana_version
solana_vest_program
solana_vote_program
solana_watchtower
spin
spl_associated_token_account
spl_memo
spl_token
stable_deref_trait
standback
static_assertions
strsim
structopt
structopt_derive
subtle
symlink
syn
synstructure
sysctl
tar
tarpc
tarpc_plugins
tempfile
termcolor
terminal_size
textwrap
thiserror
thiserror_impl
thread_scoped
time
time_macros
time_macros_impl
tiny_keccak
tinyvec
tinyvec_macros
tokio
fs
future
io
loom
macros
net
park
process
runtime
signal
stream
sync
task
time
util
tokio_codec
tokio_executor
tokio_fs
tokio_io
tokio_reactor
tokio_rustls
tokio_serde
tokio_sync
tokio_tcp
tokio_threadpool
tokio_tls
tokio_util
toml
tonic
tower
tower_balance
tower_buffer
tower_discover
tower_layer
tower_limit
tower_load
tower_load_shed
tower_make
tower_ready_cache
tower_retry
tower_service
tower_timeout
tower_util
tracing
tracing_attributes
tracing_core
tracing_futures
trees
triedb
triehash
try_lock
tungstenite
typenum
ucd_trie
uint
unicase
unicode_bidi
unicode_normalization
unicode_segmentation
unicode_width
unicode_xid
unix_socket
unreachable
untrusted
url
users
utf8
utf8_width
vec_map
velas
velas_account_program
velas_faucet
velas_genesis
velas_gossip
velas_install
velas_install_init
velas_keygen
velas_test_validator
velas_validator
void
walkdir
want
webpki
webpki_roots
websocket
websocket_base
winapi
ws2_32
xattr
yaml_rust
zeroize
zeroize_derive
zstd
zstd_safe
zstd_sys
  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
// Copyright 2017 Robert Grosse

// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

/*!
This module defines an unsafe marker trait, StableDeref, for container types that deref to a fixed address which is valid even when the containing type is moved. For example, Box, Vec, Rc, Arc and String implement this trait. Additionally, it defines CloneStableDeref for types like Rc where clones deref to the same address.

It is intended to be used by crates such as [owning_ref](https://crates.io/crates/owning_ref) and [rental](https://crates.io/crates/rental), as well as library authors who wish to make their code interoperable with such crates. For example, if you write a custom Vec type, you can implement StableDeref, and then users will be able to use your custom type together with owning_ref and rental.

no_std support can be enabled by disabling default features (specifically "std"). In this case, the trait will not be implemented for the std types mentioned above, but you can still use it for your own types.
*/

#![cfg_attr(not(feature = "std"), no_std)]

#[cfg(feature = "std")]
extern crate core;

#[cfg(feature = "alloc")]
extern crate alloc;

use core::ops::Deref;


/**
An unsafe marker trait for types that deref to a stable address, even when moved. For example, this is implemented by Box, Vec, Rc, Arc and String, among others. Even when a Box is moved, the underlying storage remains at a fixed location.

More specifically, implementors must ensure that the result of calling deref() is valid for the lifetime of the object, not just the lifetime of the borrow, and that the deref is valid even if the object is moved. Also, it must be valid even after invoking arbitrary &self methods or doing anything transitively accessible from &Self. If Self also implements DerefMut, the same restrictions apply to deref_mut() and it must remain valid if anything transitively accessible from the result of deref_mut() is mutated/called. Additionally, multiple calls to deref, (and deref_mut if implemented) must return the same address. No requirements are placed on &mut self methods other than deref_mut() and drop(), if applicable.

Basically, it must be valid to convert the result of deref() to a pointer, and later dereference that pointer, as long as the original object is still live, even if it has been moved or &self methods have been called on it. If DerefMut is also implemented, it must be valid to get pointers from deref() and deref_mut() and dereference them while the object is live, as long as you don't simultaneously dereference both of them.

Additionally, Deref and DerefMut implementations must not panic, but users of the trait are not allowed to rely on this fact (so that this restriction can be removed later without breaking backwards compatibility, should the need arise).

Here are some examples to help illustrate the requirements for implementing this trait:

```
# use std::ops::Deref;
struct Foo(u8);
impl Deref for Foo {
    type Target = u8;
    fn deref(&self) -> &Self::Target { &self.0 }
}
```

Foo cannot implement StableDeref because the int will move when Foo is moved, invalidating the result of deref().

```
# use std::ops::Deref;
struct Foo(Box<u8>);
impl Deref for Foo {
    type Target = u8;
    fn deref(&self) -> &Self::Target { &*self.0 }
}
```

Foo can safely implement StableDeref, due to the use of Box.


```
# use std::ops::Deref;
# use std::ops::DerefMut;
# use std::rc::Rc;
#[derive(Clone)]
struct Foo(Rc<u8>);
impl Deref for Foo {
    type Target = u8;
    fn deref(&self) -> &Self::Target { &*self.0 }
}
impl DerefMut for Foo {
    fn deref_mut(&mut self) -> &mut Self::Target { Rc::make_mut(&mut self.0) }
}
```

This is a simple implementation of copy-on-write: Foo's deref_mut will copy the underlying int if it is not uniquely owned, ensuring unique access at the point where deref_mut() returns. However, Foo cannot implement StableDeref because calling deref_mut(), followed by clone().deref() will result in mutable and immutable references to the same location. Note that if the DerefMut implementation were removed, Foo could safely implement StableDeref. Likewise, if the Clone implementation were removed, it would be safe to implement StableDeref, although Foo would not be very useful in that case, (without clones, the rc will always be uniquely owned).


```
# use std::ops::Deref;
struct Foo;
impl Deref for Foo {
    type Target = str;
    fn deref(&self) -> &Self::Target { &"Hello" }
}
```
Foo can safely implement StableDeref. It doesn't own the data being derefed, but the data is gaurenteed to live long enough, due to it being 'static.

```
# use std::ops::Deref;
# use std::cell::Cell;
struct Foo(Cell<bool>);
impl Deref for Foo {
    type Target = str;
    fn deref(&self) -> &Self::Target {
        let b = self.0.get();
        self.0.set(!b);
        if b { &"Hello" } else { &"World" }
    }
}
```
Foo cannot safely implement StableDeref, even though every possible result of deref lives long enough. In order to safely implement StableAddress, multiple calls to deref must return the same result.

```
# use std::ops::Deref;
# use std::ops::DerefMut;
struct Foo(Box<(u8, u8)>);
impl Deref for Foo {
    type Target = u8;
    fn deref(&self) -> &Self::Target { &self.0.deref().0 }
}
impl DerefMut for Foo {
    fn deref_mut(&mut self) -> &mut Self::Target { &mut self.0.deref_mut().1 }
}
```

Foo cannot implement StableDeref because deref and deref_mut return different addresses.


*/
pub unsafe trait StableDeref: Deref {}

/**
An unsafe marker trait for types where clones deref to the same address. This has all the requirements of StableDeref, and additionally requires that after calling clone(), both the old and new value deref to the same address. For example, Rc and Arc implement CloneStableDeref, but Box and Vec do not.

Note that a single type should never implement both DerefMut and CloneStableDeref. If it did, this would let you get two mutable references to the same location, by cloning and then calling deref_mut() on both values.
*/
pub unsafe trait CloneStableDeref: StableDeref + Clone {}

/////////////////////////////////////////////////////////////////////////////
// std types integration
/////////////////////////////////////////////////////////////////////////////

#[cfg(feature = "alloc")]
use alloc::boxed::Box;
#[cfg(feature = "alloc")]
use alloc::rc::Rc;
#[cfg(feature = "alloc")]
use alloc::sync::Arc;
#[cfg(feature = "alloc")]
use alloc::vec::Vec;
#[cfg(feature = "alloc")]
use alloc::string::String;

#[cfg(feature = "std")]
use std::ffi::{CString, OsString};
#[cfg(feature = "std")]
use std::path::PathBuf;
#[cfg(feature = "std")]
use std::sync::{MutexGuard, RwLockReadGuard, RwLockWriteGuard};

use core::cell::{Ref, RefMut};


#[cfg(feature = "alloc")]
unsafe impl<T: ?Sized> StableDeref for Box<T> {}
#[cfg(feature = "alloc")]
unsafe impl<T> StableDeref for Vec<T> {}
#[cfg(feature = "alloc")]
unsafe impl StableDeref for String {}
#[cfg(feature = "std")]
unsafe impl StableDeref for CString {}
#[cfg(feature = "std")]
unsafe impl StableDeref for OsString {}
#[cfg(feature = "std")]
unsafe impl StableDeref for PathBuf {}

#[cfg(feature = "alloc")]
unsafe impl<T: ?Sized> StableDeref for Rc<T> {}
#[cfg(feature = "alloc")]
unsafe impl<T: ?Sized> CloneStableDeref for Rc<T> {}
#[cfg(feature = "alloc")]
unsafe impl<T: ?Sized> StableDeref for Arc<T> {}
#[cfg(feature = "alloc")]
unsafe impl<T: ?Sized> CloneStableDeref for Arc<T> {}

unsafe impl<'a, T: ?Sized> StableDeref for Ref<'a, T> {}
unsafe impl<'a, T: ?Sized> StableDeref for RefMut<'a, T> {}
#[cfg(feature = "std")]
unsafe impl<'a, T: ?Sized> StableDeref for MutexGuard<'a, T> {}
#[cfg(feature = "std")]
unsafe impl<'a, T: ?Sized> StableDeref for RwLockReadGuard<'a, T> {}
#[cfg(feature = "std")]
unsafe impl<'a, T: ?Sized> StableDeref for RwLockWriteGuard<'a, T> {}

unsafe impl<'a, T: ?Sized> StableDeref for &'a T {}
unsafe impl<'a, T: ?Sized> CloneStableDeref for &'a T {}
unsafe impl<'a, T: ?Sized> StableDeref for &'a mut T {}