openharmony/third_party_rust_foreign-types
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Make foreign_type! more powerful

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Closes #1
This commit is contained in:
Steven Fackler
2017-01-29 21:04:42 -08:00
parent 7f69095beb
commit 384c208bb2
1 changed files with 43 additions and 8 deletions
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src/lib.rs
+43 -8
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@@ -83,7 +83,14 @@
//! }
//! }
//!
//! foreign_type!(Foo, FooRef, foo_sys::FOO, foo_sys::FOO_free);
//! foreign_type! {
//! /// A Foo.
//! owned: Foo;
//! /// A borrowed Foo.
//! borrowed: FooRef;
//! ctype: foo_sys::FOO;
//! drop: foo_sys::FOO_free;
//! }
//!
//! # fn main() {}
//! ```
@@ -124,8 +131,23 @@
//! }
//! }
//!
//! foreign_type!(Foo, FooRef, foo_sys::FOO, foo_sys::FOO_free);
//! foreign_type!(Bar, BarRef, foo_sys::BAR, foo_sys::BAR_free);
//! foreign_type! {
//! /// A Foo.
//! owned: Foo;
//! /// A borrowed Foo.
//! borrowed: FooRef;
//! ctype: foo_sys::FOO;
//! drop: foo_sys::FOO_free;
//! }
//!
//! foreign_type! {
//! /// A Bar.
//! owned: Bar;
//! /// A borrowed Bar.
//! borrowed: BarRef;
//! ctype: foo_sys::BAR;
//! drop: foo_sys::BAR_free;
//! }
//!
//! impl BarRef {
//! fn foo(&self) -> &FooRef {
@@ -182,9 +204,6 @@ pub trait ForeignTypeRef: Sized {
/// A macro to easily define wrappers for foreign types.
///
/// Four arguments must be provided: the name of the owned type, the name of the borrowed type,
/// the raw C type, and the free function.
///
/// # Examples
///
/// ```
@@ -192,13 +211,28 @@ pub trait ForeignTypeRef: Sized {
/// extern crate foreign_types;
///
/// # mod openssl_sys { pub type SSL = (); pub unsafe fn SSL_free(_: *mut SSL) {} }
/// foreign_type!(Ssl, SslRef, openssl_sys::SSL, openssl_sys::SSL_free);
/// foreign_type! {
/// /// Documentation for the owned type.
/// owned: Ssl;
/// /// Documentation for the borrowed type.
/// borrowed: SslRef;
/// ctype: openssl_sys::SSL;
/// drop: openssl_sys::SSL_free;
/// }
///
/// # fn main() {}
/// ```
#[macro_export]
macro_rules! foreign_type {
($owned:ident, $borrowed:ident, $ctype:ty, $drop:expr) => {
(
$(#[$owned_attr:meta])*
owned: $owned:ident;
$(#[$borrowed_attr:meta])*
borrowed: $borrowed:ident;
ctype: $ctype:ty;
drop: $drop:expr;
) => {
$(#[$owned_attr])*
pub struct $owned(*mut $ctype);
impl $crate::ForeignType for $owned {
@@ -230,6 +264,7 @@ macro_rules! foreign_type {
}
}
$(#[$borrowed_attr])*
pub struct $borrowed($crate::Opaque);
impl $crate::ForeignTypeRef for $borrowed {