Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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47 lines
1.7 KiB
47 lines
1.7 KiB
// Protocol Buffers - Google's data interchange format |
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// Copyright 2023 Google LLC. All rights reserved. |
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// |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file or at |
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// https://developers.google.com/open-source/licenses/bsd |
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//! Runtime-internal macros |
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/// Defines a `impl SettableValue<$proxied> for SomeType` body that forwards to |
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/// another implementation. |
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/// |
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/// # Example |
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/// ```ignore |
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/// impl<'a, const N: usize> SettableValue<[u8]> for &'a [u8; N] { |
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/// // Use the `SettableValue<[u8]>` implementation for `&[u8]`: |
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/// impl_forwarding_settable_value!([u8], self => &self[..]); |
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/// } |
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/// ``` |
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macro_rules! impl_forwarding_settable_value { |
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($proxied:ty, $self:ident => $self_forwarding_expr:expr) => { |
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fn set_on<'b>( |
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$self, |
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_private: $crate::__internal::Private, |
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mutator: $crate::Mut<'b, $proxied>, |
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) where $proxied: 'b { |
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($self_forwarding_expr).set_on(Private, mutator) |
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} |
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fn set_on_absent( |
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$self, |
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_private: $crate::__internal::Private, |
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absent_mutator: <$proxied as $crate::ProxiedWithPresence>::AbsentMutData<'_>, |
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) -> <$proxied as $crate::ProxiedWithPresence>::PresentMutData<'_> { |
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($self_forwarding_expr).set_on_absent($crate::__internal::Private, absent_mutator) |
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} |
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fn set_on_present( |
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$self, |
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_private: $crate::__internal::Private, |
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present_mutator: <$proxied as $crate::ProxiedWithPresence>::PresentMutData<'_>, |
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) { |
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($self_forwarding_expr).set_on_present($crate::__internal::Private, present_mutator) |
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} |
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}; |
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} |
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pub(crate) use impl_forwarding_settable_value;
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