sgx_types/src/marker.rs

macro_rules! impl_marker_for {
    ($traitname:ident, $($ty:ty)*) => {
        $(
            impl $traitname for $ty { }
        )*
    }
}

macro_rules! impl_marker_for_array {
    ($traitname:ident, $($N:expr)+) => {
        $(
            impl<T: $traitname> $traitname for [T; $N] { }
        )+
    }
}

macro_rules! impl_unsafe_marker_for {
    ($traitname:ident, $($ty:ty)*) => {
        $(
            unsafe impl $traitname for $ty { }
        )*
    }
}

macro_rules! impl_unsafe_marker_for_array {
    ($traitname:ident, $($N:expr)+) => {
        $(
            unsafe impl<T: $traitname> $traitname for [T; $N] { }
        )+
    }
}

/// Trait implemented for types that can be compared for equality using their bytewise representation
/// A type can implement BytewiseEquality if all of its components implement BytewiseEquality.
pub trait BytewiseEquality { }


impl_marker_for!(BytewiseEquality,
                 u8 i8 u16 i16 u32 i32 u64 i64 usize isize char bool);

impl<T: BytewiseEquality> BytewiseEquality for [T] { }

impl_marker_for_array! {BytewiseEquality,
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    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
}


pub unsafe trait ContiguousMemory { }

impl_unsafe_marker_for!(ContiguousMemory,
                 u8 i8 u16 i16 u32 i32 u64 i64 usize isize char bool);

unsafe impl<T: ContiguousMemory> ContiguousMemory for [T] { }


impl_unsafe_marker_for_array! {ContiguousMemory,
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    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
}

/*
impl<T: ?Sized> !ContiguousMemory for * const T {}
impl<T: ?Sized> !ContiguousMemory for * mut T {}
impl<'a, T: 'a + ?Sized> !ContiguousMemory for &'a T {}
impl<'a, T: 'a + ?Sized> !ContiguousMemory for &'a mut T {}
*/