#[macro_export]
macro_rules! ENUM {
{enum $name:ident { $($variant:ident = $value:expr,)+ }} => {
pub type $name = u32;
$(pub const $variant: $name = $value;)+
};
{enum $name:ident { $variant:ident = $value:expr, $($rest:tt)* }} => {
pub type $name = u32;
pub const $variant: $name = $value;
ENUM!{@gen $name $variant, $($rest)*}
};
{enum $name:ident { $variant:ident, $($rest:tt)* }} => {
ENUM!{enum $name { $variant = 0, $($rest)* }}
};
{@gen $name:ident $base:ident,} => {};
{@gen $name:ident $base:ident, $variant:ident = $value:expr, $($rest:tt)*} => {
pub const $variant: $name = $value;
ENUM!{@gen $name $variant, $($rest)*}
};
{@gen $name:ident $base:ident, $variant:ident, $($rest:tt)*} => {
pub const $variant: $name = $base + 1u32;
ENUM!{@gen $name $variant, $($rest)*}
};
}
#[macro_export]
macro_rules! STRUCT {
(#[debug] $($rest:tt)*) => (
STRUCT!{#[cfg_attr(feature = "impl-debug", derive(Debug))] $($rest)*}
);
($(#[$attrs:meta])* struct $name:ident {
$($field:ident: $ftype:ty,)+
}) => (
#[repr(C)] #[derive(Copy)] $(#[$attrs])*
pub struct $name {
$(pub $field: $ftype,)+
}
impl Clone for $name {
#[inline]
fn clone(&self) -> $name { *self }
}
#[cfg(feature = "impl-default")]
impl Default for $name {
#[inline]
fn default() -> $name { unsafe { std::mem::zeroed() } }
}
);
}
macro_rules! UNION {
($(#[$attrs:meta])* union $name:ident {
[$stype:ty; $ssize:expr],
$($variant:ident $variant_mut:ident: $ftype:ty,)+
}) => (
#[repr(C)] $(#[$attrs])*
pub struct $name([$stype; $ssize]);
impl Copy for $name {}
impl Clone for $name {
#[inline]
fn clone(&self) -> $name { *self }
}
#[cfg(feature = "impl-default")]
impl Default for $name {
#[inline]
fn default() -> $name { unsafe { std::mem::zeroed() } }
}
impl $name {$(
#[inline]
pub unsafe fn $variant(&self) -> &$ftype {
&*(self as *const _ as *const $ftype)
}
#[inline]
pub unsafe fn $variant_mut(&mut self) -> &mut $ftype {
&mut *(self as *mut _ as *mut $ftype)
}
)+}
);
($(#[$attrs:meta])* union $name:ident {
[$stype32:ty; $ssize32:expr] [$stype64:ty; $ssize64:expr],
$($variant:ident $variant_mut:ident: $ftype:ty,)+
}) => (
#[repr(C)] $(#[$attrs])* #[cfg(target_arch = "x86")]
pub struct $name([$stype32; $ssize32]);
#[repr(C)] $(#[$attrs])* #[cfg(target_pointer_width = "64")]
pub struct $name([$stype64; $ssize64]);
impl Copy for $name {}
impl Clone for $name {
#[inline]
fn clone(&self) -> $name { *self }
}
#[cfg(feature = "impl-default")]
impl Default for $name {
#[inline]
fn default() -> $name { unsafe { std::mem::zeroed() } }
}
impl $name {$(
#[inline]
pub unsafe fn $variant(&self) -> &$ftype {
&*(self as *const _ as *const $ftype)
}
#[inline]
pub unsafe fn $variant_mut(&mut self) -> &mut $ftype {
&mut *(self as *mut _ as *mut $ftype)
}
)+}
);
}