50 lines
2.1 KiB
Rust
50 lines
2.1 KiB
Rust
//! Public macros for porvide.d for users to be able implement our `io::Write` trait.
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#[macro_export]
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/// Because we cannot provide a blanket implementation of [`std::io::Write`] for all implementers
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/// of this crate's `io::Write` trait, we provide this macro instead.
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///
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/// This macro will implement `Write` given a `write` and `flush` fn, either by implementing the
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/// crate's native `io::Write` trait directly, or a more generic trait from `std` for users using
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/// that feature. In any case, this crate's `io::Write` feature will be implemented for the given
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/// type, even if indirectly.
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#[cfg(not(feature = "std"))]
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macro_rules! impl_write {
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($ty: ty, $write_fn: expr, $flush_fn: expr $(, $bounded_ty: ident : $bounds: path),*) => {
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impl<$($bounded_ty: $bounds),*> $crate::Write for $ty {
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#[inline]
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fn write(&mut self, buf: &[u8]) -> $crate::Result<usize> {
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$write_fn(self, buf)
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}
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#[inline]
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fn flush(&mut self) -> $crate::Result<()> {
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$flush_fn(self)
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}
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}
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}
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}
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#[macro_export]
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/// Because we cannot provide a blanket implementation of [`std::io::Write`] for all implementers
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/// of this crate's `io::Write` trait, we provide this macro instead.
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///
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/// This macro will implement `Write` given a `write` and `flush` fn, either by implementing the
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/// crate's native `io::Write` trait directly, or a more generic trait from `std` for users using
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/// that feature. In any case, this crate's `io::Write` feature will be implemented for the given
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/// type, even if indirectly.
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#[cfg(feature = "std")]
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macro_rules! impl_write {
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($ty: ty, $write_fn: expr, $flush_fn: expr $(, $bounded_ty: ident : $bounds: path),*) => {
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impl<$($bounded_ty: $bounds),*> std::io::Write for $ty {
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#[inline]
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fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
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$write_fn(self, buf)
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}
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#[inline]
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fn flush(&mut self) -> std::io::Result<()> {
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$flush_fn(self)
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}
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}
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}
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}
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