Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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30 lines
1.3 KiB
30 lines
1.3 KiB
// Protocol Buffers - Google's data interchange format |
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// Copyright 2024 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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use super::upb_MiniTable; |
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/// A trait for types which have a constant associated MiniTable (e.g. |
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/// generated messages, and their mut and view proxy types). |
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/// |
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/// upb_Message in C is effectively a DST type, where instances are created with |
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/// a MiniTable (and have a size dependent on the given MiniTable). Many upb |
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/// operations on the upb_Message* will require the same upb_MiniTable* to be |
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/// passed in as a parameter, which is referred to as 'the associated MiniTable |
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/// for the upb_Message instance' in safety comments. |
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/// |
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/// This trait is a way to statically associate a MiniTable with Rust types |
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/// which hold upb_Message* to simplify ensuring the upb C invariants |
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/// are maintained. |
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/// |
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/// SAFETY: |
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/// - The MiniTable pointer must be from Protobuf code generation and follow the |
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/// corresponding invariants associated with upb's C API (the pointer should |
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/// always have the same non-null value, the underlying pointee should never |
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/// be modified and should have 'static lifetime). |
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pub unsafe trait AssociatedMiniTable { |
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const MINI_TABLE: *const upb_MiniTable; |
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}
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