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#[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)
            }
        )+}
    );
}