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Vendor dependencies for 0.3.0 release

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Robert Garrett
2025-09-27 10:29:08 -05:00
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Permission is hereby granted, free of charge, to any
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DEALINGS IN THE SOFTWARE.

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Erased Serde
============
[<img alt="github" src="https://img.shields.io/badge/github-dtolnay/erased--serde-8da0cb?style=for-the-badge&labelColor=555555&logo=github" height="20">](https://github.com/dtolnay/erased-serde)
[<img alt="crates.io" src="https://img.shields.io/crates/v/erased-serde.svg?style=for-the-badge&color=fc8d62&logo=rust" height="20">](https://crates.io/crates/erased-serde)
[<img alt="docs.rs" src="https://img.shields.io/badge/docs.rs-erased--serde-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs" height="20">](https://docs.rs/erased-serde)
[<img alt="build status" src="https://img.shields.io/github/actions/workflow/status/dtolnay/erased-serde/ci.yml?branch=master&style=for-the-badge" height="20">](https://github.com/dtolnay/erased-serde/actions?query=branch%3Amaster)
This crate provides type-erased versions of Serde's `Serialize`, `Serializer`
and `Deserializer` traits that can be used as [trait objects].
[trait objects]: https://doc.rust-lang.org/book/first-edition/trait-objects.html
- [`erased_serde::Serialize`](https://docs.rs/erased-serde/0.4/erased_serde/trait.Serialize.html)
- [`erased_serde::Serializer`](https://docs.rs/erased-serde/0.4/erased_serde/trait.Serializer.html)
- [`erased_serde::Deserializer`](https://docs.rs/erased-serde/0.4/erased_serde/trait.Deserializer.html)
The usual Serde `Serialize`, `Serializer` and `Deserializer` traits cannot be
used as trait objects like `&dyn Serialize` or boxed trait objects like
`Box<dyn Serialize>` because of Rust's ["object safety" rules]. In particular,
all three traits contain generic methods which cannot be made into a trait
object.
["object safety" rules]: http://huonw.github.io/blog/2015/01/object-safety/
This library should be considered a low-level building block for interacting
with Serde APIs in an object-safe way. Most use cases will require higher level
functionality such as provided by [`typetag`] which uses this crate internally.
[`typetag`]: https://github.com/dtolnay/typetag
**The traits in this crate work seamlessly with any existing Serde `Serialize`
and `Deserialize` type and any existing Serde `Serializer` and `Deserializer`
format.**
```toml
[dependencies]
serde = "1.0"
erased-serde = "0.4"
```
## Serialization
```rust
use erased_serde::{Serialize, Serializer};
use std::collections::BTreeMap as Map;
use std::io;
fn main() {
// Construct some serializers.
let json = &mut serde_json::Serializer::new(io::stdout());
let cbor = &mut serde_cbor::Serializer::new(serde_cbor::ser::IoWrite::new(io::stdout()));
// The values in this map are boxed trait objects. Ordinarily this would not
// be possible with serde::Serializer because of object safety, but type
// erasure makes it possible with erased_serde::Serializer.
let mut formats: Map<&str, Box<dyn Serializer>> = Map::new();
formats.insert("json", Box::new(<dyn Serializer>::erase(json)));
formats.insert("cbor", Box::new(<dyn Serializer>::erase(cbor)));
// These are boxed trait objects as well. Same thing here - type erasure
// makes this possible.
let mut values: Map<&str, Box<dyn Serialize>> = Map::new();
values.insert("vec", Box::new(vec!["a", "b"]));
values.insert("int", Box::new(65536));
// Pick a Serializer out of the formats map.
let format = formats.get_mut("json").unwrap();
// Pick a Serialize out of the values map.
let value = values.get("vec").unwrap();
// This line prints `["a","b"]` to stdout.
value.erased_serialize(format).unwrap();
}
```
## Deserialization
```rust
use erased_serde::Deserializer;
use std::collections::BTreeMap as Map;
fn main() {
static JSON: &[u8] = br#"{"A": 65, "B": 66}"#;
static CBOR: &[u8] = &[162, 97, 65, 24, 65, 97, 66, 24, 66];
// Construct some deserializers.
let json = &mut serde_json::Deserializer::from_slice(JSON);
let cbor = &mut serde_cbor::Deserializer::from_slice(CBOR);
// The values in this map are boxed trait objects, which is not possible
// with the normal serde::Deserializer because of object safety.
let mut formats: Map<&str, Box<dyn Deserializer>> = Map::new();
formats.insert("json", Box::new(<dyn Deserializer>::erase(json)));
formats.insert("cbor", Box::new(<dyn Deserializer>::erase(cbor)));
// Pick a Deserializer out of the formats map.
let format = formats.get_mut("json").unwrap();
let data: Map<String, usize> = erased_serde::deserialize(format).unwrap();
println!("{}", data["A"] + data["B"]);
}
```
## How it works
This crate is based on a general technique for building trait objects of traits
that have generic methods (like all of Serde's traits). [This example code]
demonstrates the technique applied to a simplified case of a single generic
method. [Try it in the playground.]
[This example code]: https://github.com/dtolnay/erased-serde/blob/master/explanation/main.rs
[Try it in the playground.]: https://play.rust-lang.org/?gist=c1111875e7462ba3d0190aacb2fc2211
In erased-serde things are a bit more complicated than in the example for three
reasons but the idea is the same.
- We need to deal with trait methods that take `self` by value -- effectively by
implementing the object-safe trait for `Option<T>` where `T` implements the
real trait.
- We need to deal with traits that have associated types like `Serializer::Ok`
and `Visitor::Value` -- by carefully short-term stashing things behind a
pointer.
- We need to support trait methods that have a generic type in the return type
but none of the argument types, like `SeqAccess::next_element` -- this can be
flipped around into a callback style where the return value is instead passed
on to a generic argument.
In the future maybe the Rust compiler will be able to apply this technique
automatically to any trait that is not already object safe by the current rules.
<br>
#### License
<sup>
Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.
</sup>
<br>
<sub>
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in this crate by you, as defined in the Apache-2.0 license, shall
be dual licensed as above, without any additional terms or conditions.
</sub>

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use std::env;
use std::process::Command;
use std::str;
fn main() {
println!("cargo:rerun-if-changed=build.rs");
let minor = match rustc_minor_version() {
Some(minor) => minor,
None => return,
};
if minor >= 80 {
println!("cargo:rustc-check-cfg=cfg(no_diagnostic_namespace)");
}
if minor < 78 {
println!("cargo:rustc-cfg=no_diagnostic_namespace");
}
}
fn rustc_minor_version() -> Option<u32> {
let rustc = env::var_os("RUSTC")?;
let output = Command::new(rustc).arg("--version").output().ok()?;
let version = str::from_utf8(&output.stdout).ok()?;
let mut pieces = version.split('.');
if pieces.next() != Some("rustc 1") {
return None;
}
pieces.next()?.parse().ok()
}

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use alloc::boxed::Box;
use core::any::TypeId;
use core::mem::{self, MaybeUninit};
use core::ptr;
#[cfg(feature = "unstable-debug")]
use core::any;
pub struct Any {
value: Value,
drop: unsafe fn(&mut Value),
type_id: TypeId,
/// For panic messages only. Not used for comparison.
#[cfg(feature = "unstable-debug")]
type_name: &'static str,
}
union Value {
ptr: *mut (),
inline: [MaybeUninit<usize>; 2],
}
fn is_small<T>() -> bool {
mem::size_of::<T>() <= mem::size_of::<Value>()
&& mem::align_of::<T>() <= mem::align_of::<Value>()
}
impl Any {
// This is unsafe -- caller must not hold on to the Any beyond the lifetime
// of T.
//
// Example of bad code:
//
// let s = "bad".to_owned();
// let a = Any::new(&s);
// drop(s);
//
// Now `a.as_ref()` and `a.take()` return references to a dead String.
pub(crate) unsafe fn new<T>(t: T) -> Self {
let value: Value;
let drop: unsafe fn(&mut Value);
let type_id = typeid::of::<T>();
if is_small::<T>() {
let mut inline = [MaybeUninit::uninit(); 2];
unsafe { ptr::write(inline.as_mut_ptr().cast::<T>(), t) };
value = Value { inline };
unsafe fn inline_drop<T>(value: &mut Value) {
unsafe { ptr::drop_in_place(value.inline.as_mut_ptr().cast::<T>()) }
}
drop = inline_drop::<T>;
} else {
let ptr = Box::into_raw(Box::new(t)).cast::<()>();
value = Value { ptr };
unsafe fn ptr_drop<T>(value: &mut Value) {
mem::drop(unsafe { Box::from_raw(value.ptr.cast::<T>()) });
}
drop = ptr_drop::<T>;
}
Any {
value,
drop,
type_id,
#[cfg(feature = "unstable-debug")]
type_name: any::type_name::<T>(),
}
}
// This is unsafe -- caller is responsible that T is the correct type.
pub(crate) unsafe fn take<T>(mut self) -> T {
if self.type_id != typeid::of::<T>() {
self.invalid_cast_to::<T>();
}
if is_small::<T>() {
let ptr = unsafe { self.value.inline.as_mut_ptr().cast::<T>() };
let value = unsafe { ptr::read(ptr) };
mem::forget(self);
value
} else {
let ptr = unsafe { self.value.ptr.cast::<T>() };
let box_t = unsafe { Box::from_raw(ptr) };
mem::forget(self);
*box_t
}
}
#[cfg(not(feature = "unstable-debug"))]
fn invalid_cast_to<T>(&self) -> ! {
panic!("invalid cast; enable `unstable-debug` feature to debug");
}
#[cfg(feature = "unstable-debug")]
fn invalid_cast_to<T>(&self) -> ! {
let from = self.type_name;
let to = any::type_name::<T>();
panic!("invalid cast: {} to {}", from, to);
}
}
impl Drop for Any {
fn drop(&mut self) {
unsafe { (self.drop)(&mut self.value) }
}
}

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use alloc::borrow::ToOwned;
use alloc::boxed::Box;
use alloc::string::{String, ToString};
use alloc::vec::Vec;
use core::fmt::{self, Debug, Display};
use serde::de::Expected;
/// Error when a `Serializer` or `Deserializer` trait object fails.
pub struct Error {
imp: Box<ErrorImpl>,
}
/// Result type alias where the error is `erased_serde::Error`.
pub type Result<T> = core::result::Result<T, Error>;
pub(crate) fn erase_de<E: serde::de::Error>(e: E) -> Error {
serde::de::Error::custom(e)
}
pub(crate) fn unerase_de<E: serde::de::Error>(e: Error) -> E {
e.as_serde_de_error()
}
impl Display for Error {
fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
let error = self.as_serde_de_error::<serde::de::value::Error>();
Display::fmt(&error, formatter)
}
}
impl Debug for Error {
fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
let error = self.as_serde_de_error::<serde::de::value::Error>();
Debug::fmt(&error, formatter)
}
}
impl serde::ser::StdError for Error {}
enum ErrorImpl {
Custom(String),
InvalidType {
unexpected: Unexpected,
expected: String,
},
InvalidValue {
unexpected: Unexpected,
expected: String,
},
InvalidLength {
len: usize,
expected: String,
},
UnknownVariant {
variant: String,
expected: &'static [&'static str],
},
UnknownField {
field: String,
expected: &'static [&'static str],
},
MissingField {
field: &'static str,
},
DuplicateField {
field: &'static str,
},
}
enum Unexpected {
Bool(bool),
Unsigned(u64),
Signed(i64),
Float(f64),
Char(char),
Str(String),
Bytes(Vec<u8>),
Unit,
Option,
NewtypeStruct,
Seq,
Map,
Enum,
UnitVariant,
NewtypeVariant,
TupleVariant,
StructVariant,
Other(String),
}
impl serde::ser::Error for Error {
fn custom<T: Display>(msg: T) -> Self {
let imp = Box::new(ErrorImpl::Custom(msg.to_string()));
Error { imp }
}
}
impl serde::de::Error for Error {
fn custom<T: Display>(msg: T) -> Self {
let imp = Box::new(ErrorImpl::Custom(msg.to_string()));
Error { imp }
}
fn invalid_type(unexpected: serde::de::Unexpected, expected: &dyn Expected) -> Self {
let imp = Box::new(ErrorImpl::InvalidType {
unexpected: Unexpected::from_serde(unexpected),
expected: expected.to_string(),
});
Error { imp }
}
fn invalid_value(unexpected: serde::de::Unexpected, expected: &dyn Expected) -> Self {
let imp = Box::new(ErrorImpl::InvalidValue {
unexpected: Unexpected::from_serde(unexpected),
expected: expected.to_string(),
});
Error { imp }
}
fn invalid_length(len: usize, expected: &dyn Expected) -> Self {
let imp = Box::new(ErrorImpl::InvalidLength {
len,
expected: expected.to_string(),
});
Error { imp }
}
fn unknown_variant(variant: &str, expected: &'static [&'static str]) -> Self {
let imp = Box::new(ErrorImpl::UnknownVariant {
variant: variant.to_owned(),
expected,
});
Error { imp }
}
fn unknown_field(field: &str, expected: &'static [&'static str]) -> Self {
let imp = Box::new(ErrorImpl::UnknownField {
field: field.to_owned(),
expected,
});
Error { imp }
}
fn missing_field(field: &'static str) -> Self {
let imp = Box::new(ErrorImpl::MissingField { field });
Error { imp }
}
fn duplicate_field(field: &'static str) -> Self {
let imp = Box::new(ErrorImpl::DuplicateField { field });
Error { imp }
}
}
impl Error {
fn as_serde_de_error<E: serde::de::Error>(&self) -> E {
match self.imp.as_ref() {
ErrorImpl::Custom(msg) => E::custom(msg),
ErrorImpl::InvalidType {
unexpected,
expected,
} => E::invalid_type(unexpected.as_serde(), &expected.as_str()),
ErrorImpl::InvalidValue {
unexpected,
expected,
} => E::invalid_value(unexpected.as_serde(), &expected.as_str()),
ErrorImpl::InvalidLength { len, expected } => {
E::invalid_length(*len, &expected.as_str())
}
ErrorImpl::UnknownVariant { variant, expected } => {
E::unknown_variant(variant, expected)
}
ErrorImpl::UnknownField { field, expected } => E::unknown_field(field, expected),
ErrorImpl::MissingField { field } => E::missing_field(field),
ErrorImpl::DuplicateField { field } => E::duplicate_field(field),
}
}
}
impl Unexpected {
fn from_serde(unexpected: serde::de::Unexpected) -> Self {
match unexpected {
serde::de::Unexpected::Bool(value) => Unexpected::Bool(value),
serde::de::Unexpected::Unsigned(value) => Unexpected::Unsigned(value),
serde::de::Unexpected::Signed(value) => Unexpected::Signed(value),
serde::de::Unexpected::Float(value) => Unexpected::Float(value),
serde::de::Unexpected::Char(value) => Unexpected::Char(value),
serde::de::Unexpected::Str(value) => Unexpected::Str(value.to_owned()),
serde::de::Unexpected::Bytes(value) => Unexpected::Bytes(value.to_owned()),
serde::de::Unexpected::Unit => Unexpected::Unit,
serde::de::Unexpected::Option => Unexpected::Option,
serde::de::Unexpected::NewtypeStruct => Unexpected::NewtypeStruct,
serde::de::Unexpected::Seq => Unexpected::Seq,
serde::de::Unexpected::Map => Unexpected::Map,
serde::de::Unexpected::Enum => Unexpected::Enum,
serde::de::Unexpected::UnitVariant => Unexpected::UnitVariant,
serde::de::Unexpected::NewtypeVariant => Unexpected::NewtypeVariant,
serde::de::Unexpected::TupleVariant => Unexpected::TupleVariant,
serde::de::Unexpected::StructVariant => Unexpected::StructVariant,
serde::de::Unexpected::Other(msg) => Unexpected::Other(msg.to_owned()),
}
}
fn as_serde(&self) -> serde::de::Unexpected {
match self {
Unexpected::Bool(value) => serde::de::Unexpected::Bool(*value),
Unexpected::Unsigned(value) => serde::de::Unexpected::Unsigned(*value),
Unexpected::Signed(value) => serde::de::Unexpected::Signed(*value),
Unexpected::Float(value) => serde::de::Unexpected::Float(*value),
Unexpected::Char(value) => serde::de::Unexpected::Char(*value),
Unexpected::Str(value) => serde::de::Unexpected::Str(value),
Unexpected::Bytes(value) => serde::de::Unexpected::Bytes(value),
Unexpected::Unit => serde::de::Unexpected::Unit,
Unexpected::Option => serde::de::Unexpected::Option,
Unexpected::NewtypeStruct => serde::de::Unexpected::NewtypeStruct,
Unexpected::Seq => serde::de::Unexpected::Seq,
Unexpected::Map => serde::de::Unexpected::Map,
Unexpected::Enum => serde::de::Unexpected::Enum,
Unexpected::UnitVariant => serde::de::Unexpected::UnitVariant,
Unexpected::NewtypeVariant => serde::de::Unexpected::NewtypeVariant,
Unexpected::TupleVariant => serde::de::Unexpected::TupleVariant,
Unexpected::StructVariant => serde::de::Unexpected::StructVariant,
Unexpected::Other(msg) => serde::de::Unexpected::Other(msg),
}
}
}

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"erased-serde requires that either `std` (default) or `alloc` feature is enabled"

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//! Shows a user-friendly compiler error on incompatible selected features.
#[allow(unused_macros)]
macro_rules! hide_from_rustfmt {
($mod:item) => {
$mod
};
}
#[cfg(not(feature = "alloc"))]
hide_from_rustfmt! {
mod error;
}

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//! [![github]](https://github.com/dtolnay/erased-serde)&ensp;[![crates-io]](https://crates.io/crates/erased-serde)&ensp;[![docs-rs]](https://docs.rs/erased-serde)
//!
//! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=github
//! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&labelColor=555555&logo=rust
//! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs
//!
//! <br>
//!
//! This crate provides type-erased versions of Serde's `Serialize`, `Serializer`
//! and `Deserializer` traits that can be used as [trait objects].
//!
//! [trait objects]: https://doc.rust-lang.org/book/trait-objects.html
//!
//! The usual Serde `Serialize`, `Serializer` and `Deserializer` traits cannot
//! be used as trait objects like `&dyn Serialize` or boxed trait objects like
//! `Box<dyn Serialize>` because of Rust's ["object safety" rules]. In
//! particular, all three traits contain generic methods which cannot be made
//! into a trait object.
//!
//! ["object safety" rules]: http://huonw.github.io/blog/2015/01/object-safety/
//!
//! This library should be considered a low-level building block for interacting
//! with Serde APIs in an object-safe way. Most use cases will require higher
//! level functionality such as provided by [`typetag`] which uses this crate
//! internally.
//!
//! [`typetag`]: https://github.com/dtolnay/typetag
//!
//! **The traits in this crate work seamlessly with any existing Serde
//! `Serialize` and `Deserialize` type and any existing Serde `Serializer` and
//! `Deserializer` format.**
//!
//! ## Serialization
//!
//! ```rust
//! use erased_serde::{Serialize, Serializer};
//! use std::collections::BTreeMap as Map;
//! use std::io;
//!
//! fn main() {
//! // Construct some serializers.
//! let json = &mut serde_json::Serializer::new(io::stdout());
//! let cbor = &mut serde_cbor::Serializer::new(serde_cbor::ser::IoWrite::new(io::stdout()));
//!
//! // The values in this map are boxed trait objects. Ordinarily this would not
//! // be possible with serde::Serializer because of object safety, but type
//! // erasure makes it possible with erased_serde::Serializer.
//! let mut formats: Map<&str, Box<dyn Serializer>> = Map::new();
//! formats.insert("json", Box::new(<dyn Serializer>::erase(json)));
//! formats.insert("cbor", Box::new(<dyn Serializer>::erase(cbor)));
//!
//! // These are boxed trait objects as well. Same thing here - type erasure
//! // makes this possible.
//! let mut values: Map<&str, Box<dyn Serialize>> = Map::new();
//! values.insert("vec", Box::new(vec!["a", "b"]));
//! values.insert("int", Box::new(65536));
//!
//! // Pick a Serializer out of the formats map.
//! let format = formats.get_mut("json").unwrap();
//!
//! // Pick a Serialize out of the values map.
//! let value = values.get("vec").unwrap();
//!
//! // This line prints `["a","b"]` to stdout.
//! value.erased_serialize(format).unwrap();
//! }
//! ```
//!
//! ## Deserialization
//!
//! ```rust
//! use erased_serde::Deserializer;
//! use std::collections::BTreeMap as Map;
//!
//! fn main() {
//! static JSON: &'static [u8] = br#"{"A": 65, "B": 66}"#;
//! static CBOR: &'static [u8] = &[162, 97, 65, 24, 65, 97, 66, 24, 66];
//!
//! // Construct some deserializers.
//! let json = &mut serde_json::Deserializer::from_slice(JSON);
//! let cbor = &mut serde_cbor::Deserializer::from_slice(CBOR);
//!
//! // The values in this map are boxed trait objects, which is not possible
//! // with the normal serde::Deserializer because of object safety.
//! let mut formats: Map<&str, Box<dyn Deserializer>> = Map::new();
//! formats.insert("json", Box::new(<dyn Deserializer>::erase(json)));
//! formats.insert("cbor", Box::new(<dyn Deserializer>::erase(cbor)));
//!
//! // Pick a Deserializer out of the formats map.
//! let format = formats.get_mut("json").unwrap();
//!
//! let data: Map<String, usize> = erased_serde::deserialize(format).unwrap();
//!
//! println!("{}", data["A"] + data["B"]);
//! }
//! ```
#![doc(html_root_url = "https://docs.rs/erased-serde/0.4.8")]
#![no_std]
#![deny(unsafe_op_in_unsafe_fn)]
#![allow(
clippy::box_collection,
clippy::derive_partial_eq_without_eq,
clippy::extra_unused_type_parameters,
clippy::items_after_statements,
clippy::manual_map, // https://github.com/rust-lang/rust-clippy/issues/7820
clippy::missing_errors_doc,
clippy::needless_doctest_main,
clippy::needless_pass_by_ref_mut,
clippy::needless_pass_by_value,
clippy::semicolon_if_nothing_returned, // https://github.com/rust-lang/rust-clippy/issues/7324
clippy::similar_names,
clippy::struct_field_names,
clippy::unused_self,
clippy::wildcard_imports
)]
#![allow(unknown_lints, mismatched_lifetime_syntaxes)]
extern crate alloc;
#[cfg(feature = "std")]
extern crate std;
extern crate serde_core as serde;
#[macro_use]
mod macros;
mod any;
mod de;
mod error;
mod features_check;
mod map;
mod sealed;
mod ser;
pub use crate::de::{deserialize, Deserializer};
pub use crate::error::{Error, Result};
pub use crate::ser::{serialize, Serialize, Serializer};
// Not public API.
#[doc(hidden)]
#[path = "private.rs"]
pub mod __private;

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/// Implement `serde::Serialize` for a trait object that has
/// `erased_serde::Serialize` as a supertrait.
///
/// ```
/// use erased_serde::serialize_trait_object;
///
/// trait Event: erased_serde::Serialize {
/// /* ... */
/// }
///
/// erased_serde::serialize_trait_object!(Event);
/// ```
///
/// The macro supports traits that have type parameters and/or `where` clauses.
///
/// ```
/// # use erased_serde::serialize_trait_object;
/// #
/// trait Difficult<T>: erased_serde::Serialize where T: Copy {
/// /* ... */
/// }
///
/// serialize_trait_object!(<T> Difficult<T> where T: Copy);
/// ```
#[macro_export]
macro_rules! serialize_trait_object {
($($path:tt)+) => {
$crate::__internal_serialize_trait_object!(begin $($path)+);
};
}
#[doc(hidden)]
#[macro_export]
macro_rules! __internal_serialize_trait_object {
// Invocation started with `<`, parse generics.
(begin < $($rest:tt)*) => {
$crate::__internal_serialize_trait_object!(generics () () $($rest)*);
};
// Invocation did not start with `<`.
(begin $first:tt $($rest:tt)*) => {
$crate::__internal_serialize_trait_object!(path () ($first) $($rest)*);
};
// End of generics with trailing comma.
(generics ($($generics:tt)*) () , > $($rest:tt)*) => {
$crate::__internal_serialize_trait_object!(path ($($generics)* ,) () $($rest)*);
};
// End of generics without trailing comma.
(generics ($($generics:tt)*) () > $($rest:tt)*) => {
$crate::__internal_serialize_trait_object!(path ($($generics)* ,) () $($rest)*);
};
// Generics open bracket.
(generics ($($generics:tt)*) ($($brackets:tt)*) < $($rest:tt)*) => {
$crate::__internal_serialize_trait_object!(generics ($($generics)* <) ($($brackets)* <) $($rest)*);
};
// Generics close bracket.
(generics ($($generics:tt)*) (< $($brackets:tt)*) > $($rest:tt)*) => {
$crate::__internal_serialize_trait_object!(generics ($($generics)* >) ($($brackets)*) $($rest)*);
};
// Token inside of generics.
(generics ($($generics:tt)*) ($($brackets:tt)*) $first:tt $($rest:tt)*) => {
$crate::__internal_serialize_trait_object!(generics ($($generics)* $first) ($($brackets)*) $($rest)*);
};
// End with `where` clause.
(path ($($generics:tt)*) ($($path:tt)*) where $($rest:tt)*) => {
$crate::__internal_serialize_trait_object!(sendsync ($($generics)*) ($($path)*) ($($rest)*));
};
// End without `where` clause.
(path ($($generics:tt)*) ($($path:tt)*)) => {
$crate::__internal_serialize_trait_object!(sendsync ($($generics)*) ($($path)*) ());
};
// Token inside of path.
(path ($($generics:tt)*) ($($path:tt)*) $first:tt $($rest:tt)*) => {
$crate::__internal_serialize_trait_object!(path ($($generics)*) ($($path)* $first) $($rest)*);
};
// Expand into four impls.
(sendsync ($($generics:tt)*) ($($path:tt)*) ($($bound:tt)*)) => {
$crate::__internal_serialize_trait_object!(impl ($($generics)*) ($($path)*) ($($bound)*) {
fn __check_erased_serialize_supertrait<$($generics)* __T>()
where
__T: ?$crate::__private::Sized + $($path)*,
$($bound)*
{
$crate::__private::require_erased_serialize_impl::<__T>();
}
});
$crate::__internal_serialize_trait_object!(impl ($($generics)*) ($($path)* + $crate::__private::Send) ($($bound)*));
$crate::__internal_serialize_trait_object!(impl ($($generics)*) ($($path)* + $crate::__private::Sync) ($($bound)*));
$crate::__internal_serialize_trait_object!(impl ($($generics)*) ($($path)* + $crate::__private::Send + $crate::__private::Sync) ($($bound)*));
};
// The impl.
(impl ($($generics:tt)*) ($($path:tt)*) ($($bound:tt)*) $({$($body:tt)*})*) => {
impl<'erased, $($generics)*> $crate::__private::serde::Serialize for dyn $($path)* + 'erased
where
$($bound)*
{
fn serialize<S>(&self, serializer: S) -> $crate::__private::Result<S::Ok, S::Error>
where
S: $crate::__private::serde::Serializer,
{
$($($body)*)*
$crate::serialize(self, serializer)
}
}
};
}
// TEST ////////////////////////////////////////////////////////////////////////
#[cfg(test)]
mod tests {
use crate::Serialize;
fn assert_serialize<T: ?Sized + serde::Serialize>() {}
#[test]
fn test_plain() {
trait Trait: Serialize {}
serialize_trait_object!(Trait);
assert_serialize::<dyn Trait>();
assert_serialize::<dyn Trait + Send>();
}
#[test]
fn test_type_parameter() {
trait Trait<T>: Serialize {}
serialize_trait_object!(<T> Trait<T>);
assert_serialize::<dyn Trait<u32>>();
assert_serialize::<dyn Trait<u32> + Send>();
}
#[test]
fn test_generic_bound() {
trait Trait<T: PartialEq<T>, U>: Serialize {}
serialize_trait_object!(<T: PartialEq<T>, U> Trait<T, U>);
assert_serialize::<dyn Trait<u32, ()>>();
assert_serialize::<dyn Trait<u32, ()> + Send>();
}
#[test]
fn test_where_clause() {
trait Trait<T>: Serialize
where
T: Clone,
{
}
serialize_trait_object!(<T> Trait<T> where T: Clone);
assert_serialize::<dyn Trait<u32>>();
assert_serialize::<dyn Trait<u32> + Send>();
}
}

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pub(crate) trait ResultExt<T, E> {
unsafe fn unsafe_map<U>(self, op: unsafe fn(T) -> U) -> Result<U, E>;
}
impl<T, E> ResultExt<T, E> for Result<T, E> {
unsafe fn unsafe_map<U>(self, op: unsafe fn(T) -> U) -> Result<U, E> {
match self {
Ok(t) => Ok(unsafe { op(t) }),
Err(e) => Err(e),
}
}
}
pub(crate) trait OptionExt<T> {
unsafe fn unsafe_map<U>(self, op: unsafe fn(T) -> U) -> Option<U>;
}
impl<T> OptionExt<T> for Option<T> {
unsafe fn unsafe_map<U>(self, op: unsafe fn(T) -> U) -> Option<U> {
match self {
Some(t) => Some(unsafe { op(t) }),
None => None,
}
}
}

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//! Not public API. Used as `$crate::__private` by macros.
#[doc(hidden)]
pub mod serde {
#[doc(hidden)]
pub use serde::*;
}
#[doc(hidden)]
pub use core::marker::{Send, Sized, Sync};
#[doc(hidden)]
pub type Result<T, E> = core::result::Result<T, E>;
#[doc(hidden)]
pub fn require_erased_serialize_impl<T>()
where
T: ?Sized + crate::Serialize,
{
}

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pub mod serialize {
pub trait Sealed {}
}
pub mod serializer {
pub trait Sealed {}
}
pub mod deserializer {
pub trait Sealed {}
}

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#[rustversion::attr(not(nightly), ignore = "requires nightly")]
#[cfg_attr(miri, ignore = "incompatible with miri")]
#[test]
fn ui() {
let t = trybuild::TestCases::new();
t.compile_fail("tests/ui/*.rs");
}

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// Please also update README.md when making changes to this code.
use erased_serde::{Deserializer, Serialize, Serializer};
use std::collections::BTreeMap as Map;
use std::io;
#[test]
fn serialization() {
// Construct some serializers.
let json = &mut serde_json::Serializer::new(io::stdout());
let cbor = &mut serde_cbor::Serializer::new(serde_cbor::ser::IoWrite::new(io::stdout()));
// The values in this map are boxed trait objects. Ordinarily this would not
// be possible with serde::Serializer because of object safety, but type
// erasure makes it possible with erased_serde::Serializer.
let mut formats: Map<&str, Box<dyn Serializer>> = Map::new();
formats.insert("json", Box::new(<dyn Serializer>::erase(json)));
formats.insert("cbor", Box::new(<dyn Serializer>::erase(cbor)));
// These are boxed trait objects as well. Same thing here - type erasure
// makes this possible.
let mut values: Map<&str, Box<dyn Serialize>> = Map::new();
values.insert("vec", Box::new(vec!["a", "b"]));
values.insert("int", Box::new(65536));
// Pick a Serializer out of the formats map.
let format = formats.get_mut("json").unwrap();
// Pick a Serialize out of the values map.
let value = values.get("vec").unwrap();
// This line prints `["a","b"]` to stdout.
value.erased_serialize(format).unwrap();
}
#[test]
fn deserialization() {
static JSON: &[u8] = br#"{"A": 65, "B": 66}"#;
static CBOR: &[u8] = &[162, 97, 65, 24, 65, 97, 66, 24, 66];
// Construct some deserializers.
let json = &mut serde_json::Deserializer::from_slice(JSON);
let cbor = &mut serde_cbor::Deserializer::from_slice(CBOR);
// The values in this map are boxed trait objects, which is not possible
// with the normal serde::Deserializer because of object safety.
let mut formats: Map<&str, Box<dyn Deserializer>> = Map::new();
formats.insert("json", Box::new(<dyn Deserializer>::erase(json)));
formats.insert("cbor", Box::new(<dyn Deserializer>::erase(cbor)));
// Pick a Deserializer out of the formats map.
let format = formats.get_mut("json").unwrap();
let data: Map<String, usize> = erased_serde::deserialize(format).unwrap();
println!("{}", data["A"] + data["B"]);
}

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use erased_serde::serialize_trait_object;
pub trait MyTrait: erased_serde::Serialize {}
serialize_trait_object!(MyTrait);
pub trait MyGenericTrait<'a, T>: erased_serde::Serialize {}
serialize_trait_object!(<'a, T> MyGenericTrait<'a, T>);

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use erased_serde::serialize_trait_object;
pub trait MyTrait {}
serialize_trait_object!(MyTrait);
fn main() {}

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error[E0277]: the trait bound `__T: serde::Serialize` is not satisfied
--> tests/ui/missing-supertrait.rs:5:1
|
5 | serialize_trait_object!(MyTrait);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `serde::Serialize` is not implemented for `__T`, so it does not implement `erased_serde::Serialize`
|
= note: required for `__T` to implement `erased_serde::Serialize`
note: required by a bound in `require_erased_serialize_impl`
--> src/private.rs
|
| pub fn require_erased_serialize_impl<T>()
| ----------------------------- required by a bound in this function
| where
| T: ?Sized + crate::Serialize,
| ^^^^^^^^^^^^^^^^ required by this bound in `require_erased_serialize_impl`
= note: this error originates in the macro `$crate::__internal_serialize_trait_object` which comes from the expansion of the macro `serialize_trait_object` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider further restricting type parameter `__T` with trait `Serialize`
|
5 | serialize_trait_object!(MyTrait + serde_core::ser::Serialize);
| ++++++++++++++++++++++++++++