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
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
//! A crate for safe and ergonomic [pin-projection].
//!
//! # Examples
//!
//! [`#[pin_project]`][`pin_project`] attribute creates projection types
//! covering all the fields of struct or enum.
//!
//! ```rust
//! use std::pin::Pin;
//!
//! use pin_project::pin_project;
//!
//! #[pin_project]
//! struct Struct<T, U> {
//!     #[pin]
//!     pinned: T,
//!     unpinned: U,
//! }
//!
//! impl<T, U> Struct<T, U> {
//!     fn method(self: Pin<&mut Self>) {
//!         let this = self.project();
//!         let _: Pin<&mut T> = this.pinned; // Pinned reference to the field
//!         let _: &mut U = this.unpinned; // Normal reference to the field
//!     }
//! }
//! ```
//!
//! [*code like this will be generated*][struct-default-expanded]
//!
//! To use `#[pin_project]` on enums, you need to name the projection type
//! returned from the method.
//!
//! ```rust
//! use std::pin::Pin;
//!
//! use pin_project::pin_project;
//!
//! #[pin_project(project = EnumProj)]
//! enum Enum<T, U> {
//!     Pinned(#[pin] T),
//!     Unpinned(U),
//! }
//!
//! impl<T, U> Enum<T, U> {
//!     fn method(self: Pin<&mut Self>) {
//!         match self.project() {
//!             EnumProj::Pinned(x) => {
//!                 let _: Pin<&mut T> = x;
//!             }
//!             EnumProj::Unpinned(y) => {
//!                 let _: &mut U = y;
//!             }
//!         }
//!     }
//! }
//! ```
//!
//! [*code like this will be generated*][enum-default-expanded]
//!
//! See [`#[pin_project]`][`pin_project`] attribute for more details, and
//! see [examples] directory for more examples and generated code.
//!
//! [examples]: https://github.com/taiki-e/pin-project/blob/master/examples/README.md
//! [enum-default-expanded]: https://github.com/taiki-e/pin-project/blob/master/examples/enum-default-expanded.rs
//! [pin-projection]: core::pin#projections-and-structural-pinning
//! [struct-default-expanded]: https://github.com/taiki-e/pin-project/blob/master/examples/struct-default-expanded.rs

#![no_std]
#![doc(test(
    no_crate_inject,
    attr(
        deny(warnings, rust_2018_idioms, single_use_lifetimes),
        allow(dead_code, unused_variables)
    )
))]
#![warn(future_incompatible, rust_2018_idioms, single_use_lifetimes, unreachable_pub)]
#![warn(missing_docs)]
#![warn(clippy::all, clippy::default_trait_access)]
#![allow(clippy::needless_doctest_main)]

#[doc(inline)]
pub use pin_project_internal::pin_project;
#[doc(inline)]
pub use pin_project_internal::pinned_drop;

/// A trait used for custom implementations of [`Unpin`].
///
/// This trait is used in conjunction with the `UnsafeUnpin` argument to
/// the [`#[pin_project]`][macro@pin_project] attribute.
///
/// The Rust [`Unpin`] trait is safe to implement - by itself,
/// implementing it cannot lead to [undefined behavior][undefined-behavior].
/// Undefined behavior can only occur when other unsafe code is used.
///
/// It turns out that using pin projections, which requires unsafe code,
/// imposes additional requirements on an [`Unpin`] impl. Normally, all of this
/// unsafety is contained within this crate, ensuring that it's impossible for
/// you to violate any of the guarantees required by pin projection.
///
/// However, things change if you want to provide a custom [`Unpin`] impl
/// for your `#[pin_project]` type. As stated in [the Rust
/// documentation][pin-projection], you must be sure to only implement [`Unpin`]
/// when all of your `#[pin]` fields (i.e. structurally pinned fields) are also
/// [`Unpin`].
///
/// To help highlight this unsafety, the `UnsafeUnpin` trait is provided.
/// Implementing this trait is logically equivalent to implementing [`Unpin`] -
/// this crate will generate an [`Unpin`] impl for your type that 'forwards' to
/// your `UnsafeUnpin` impl. However, this trait is `unsafe` - since your type
/// uses structural pinning (otherwise, you wouldn't be using this crate!),
/// you must be sure that your `UnsafeUnpin` impls follows all of
/// the requirements for an [`Unpin`] impl of a structurally-pinned type.
///
/// Note that if you specify `#[pin_project(UnsafeUnpin)]`, but do *not*
/// provide an impl of `UnsafeUnpin`, your type will never implement [`Unpin`].
/// This is effectively the same thing as adding a [`PhantomPinned`] to your
/// type.
///
/// Since this trait is `unsafe`, impls of it will be detected by the
/// `unsafe_code` lint, and by tools like [`cargo geiger`][cargo-geiger].
///
/// # Examples
///
/// An `UnsafeUnpin` impl which, in addition to requiring that structurally
/// pinned fields be [`Unpin`], imposes an additional requirement:
///
/// ```rust
/// use pin_project::{pin_project, UnsafeUnpin};
///
/// #[pin_project(UnsafeUnpin)]
/// struct Struct<K, V> {
///     #[pin]
///     field_1: K,
///     field_2: V,
/// }
///
/// unsafe impl<K, V> UnsafeUnpin for Struct<K, V> where K: Unpin + Clone {}
/// ```
///
/// [`PhantomPinned`]: core::marker::PhantomPinned
/// [cargo-geiger]: https://github.com/rust-secure-code/cargo-geiger
/// [pin-projection]: core::pin#projections-and-structural-pinning
/// [undefined-behavior]: https://doc.rust-lang.org/reference/behavior-considered-undefined.html
pub unsafe trait UnsafeUnpin {}

// Not public API.
#[doc(hidden)]
pub mod __private {
    #[doc(hidden)]
    pub use core::{
        marker::{PhantomData, PhantomPinned, Unpin},
        mem::ManuallyDrop,
        ops::Drop,
        pin::Pin,
        ptr,
    };

    #[doc(hidden)]
    pub use pin_project_internal::__PinProjectInternalDerive;

    use super::UnsafeUnpin;

    // An internal trait used for custom implementations of [`Drop`].
    //
    // **Do not call or implement this trait directly.**
    //
    // # Why this trait is private and `#[pinned_drop]` attribute is needed?
    //
    // Implementing `PinnedDrop::drop` is safe, but calling it is not safe.
    // This is because destructors can be called multiple times in safe code and
    // [double dropping is unsound][rust-lang/rust#62360].
    //
    // Ideally, it would be desirable to be able to forbid manual calls in
    // the same way as [`Drop::drop`], but the library cannot do it. So, by using
    // macros and replacing them with private traits,
    // this crate prevent users from calling `PinnedDrop::drop` in safe code.
    //
    // This allows implementing [`Drop`] safely using `#[pinned_drop]`.
    // Also by using the [`drop`] function just like dropping a type that directly
    // implements [`Drop`], can drop safely a type that implements `PinnedDrop`.
    //
    // [rust-lang/rust#62360]: https://github.com/rust-lang/rust/pull/62360
    #[doc(hidden)]
    pub trait PinnedDrop {
        #[doc(hidden)]
        unsafe fn drop(self: Pin<&mut Self>);
    }

    // This is an internal helper struct used by `pin-project-internal`.
    // This allows us to force an error if the user tries to provide
    // a regular `Unpin` impl when they specify the `UnsafeUnpin` argument.
    // This is why we need Wrapper:
    //
    // Supposed we have the following code:
    //
    // ```rust
    // #[pin_project(UnsafeUnpin)]
    // struct MyStruct<T> {
    //     #[pin] field: T
    // }
    //
    // impl<T> Unpin for MyStruct<T> where MyStruct<T>: UnsafeUnpin {} // generated by pin-project-internal
    // impl<T> Unpin for MyStruct<T> where T: Copy // written by the user
    // ```
    //
    // We want this code to be rejected - the user is completely bypassing
    // `UnsafeUnpin`, and providing an unsound Unpin impl in safe code!
    //
    // Unfortunately, the Rust compiler will accept the above code.
    // Because MyStruct is declared in the same crate as the user-provided impl,
    // the compiler will notice that `MyStruct<T>: UnsafeUnpin` never holds.
    //
    // The solution is to introduce the `Wrapper` struct, which is defined
    // in the `pin-project` crate.
    //
    // We now have code that looks like this:
    //
    // ```rust
    // impl<T> Unpin for MyStruct<T> where Wrapper<MyStruct<T>>: UnsafeUnpin {} // generated by pin-project-internal
    // impl<T> Unpin for MyStruct<T> where T: Copy // written by the user
    // ```
    //
    // We also have `unsafe impl<T> UnsafeUnpin for Wrapper<T> where T: UnsafeUnpin {}`
    // in the `pin-project` crate.
    //
    // Now, our generated impl has a bound involving a type defined in another
    // crate - Wrapper. This will cause rust to conservatively assume that
    // `Wrapper<MyStruct<T>>: UnsafeUnpin` holds, in the interest of preserving
    // forwards compatibility (in case such an impl is added for Wrapper<T> in
    // a new version of the crate).
    //
    // This will cause rust to reject any other `Unpin` impls for MyStruct<T>,
    // since it will assume that our generated impl could potentially apply in
    // any situation.
    //
    // This achieves the desired effect - when the user writes
    // `#[pin_project(UnsafeUnpin)]`, the user must either provide no impl of
    // `UnsafeUnpin` (which is equivalent to making the type never implement
    // Unpin), or provide an impl of `UnsafeUnpin`. It is impossible for them to
    // provide an impl of `Unpin`
    #[doc(hidden)]
    pub struct Wrapper<'a, T: ?Sized>(PhantomData<&'a ()>, T);

    unsafe impl<T: ?Sized> UnsafeUnpin for Wrapper<'_, T> where T: UnsafeUnpin {}

    // This is an internal helper struct used by `pin-project-internal`.
    //
    // See https://github.com/taiki-e/pin-project/pull/53 for more details.
    #[doc(hidden)]
    pub struct AlwaysUnpin<'a, T>(PhantomData<&'a ()>, PhantomData<T>);

    impl<T> Unpin for AlwaysUnpin<'_, T> {}

    // This is an internal helper used to ensure a value is dropped.
    #[doc(hidden)]
    pub struct UnsafeDropInPlaceGuard<T: ?Sized>(pub *mut T);

    impl<T: ?Sized> Drop for UnsafeDropInPlaceGuard<T> {
        fn drop(&mut self) {
            unsafe {
                ptr::drop_in_place(self.0);
            }
        }
    }

    // This is an internal helper used to ensure a value is overwritten without
    // its destructor being called.
    #[doc(hidden)]
    pub struct UnsafeOverwriteGuard<T> {
        pub value: ManuallyDrop<T>,
        pub target: *mut T,
    }

    impl<T> Drop for UnsafeOverwriteGuard<T> {
        fn drop(&mut self) {
            unsafe {
                ptr::write(self.target, ptr::read(&*self.value));
            }
        }
    }
}