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Merge rust-bitcoin/rust-bitcoin#1339: Improve documentation on the `all` module 

2157e69857 Document the `all` module (Tobin C. Harding)

Pull request description:

  Improve documentation on the `all` module by doing:
  - Document guarantee that `all` will only ever contain opcode constants
  - Fix stale/incorrect code comment

  Done as follow up to #1295

ACKs for top commit:
  apoelstra:
    ACK 2157e69857
  Kixunil:
    ACK 2157e69857

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This commit is contained in:
Andrew Poelstra 2022-11-06 13:42:40 +00:00
parent fb22e5b9c3 2157e69857
commit c288141629
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1 changed files with 17 additions and 5 deletions
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22
bitcoin/src/blockdata/opcodes.rs
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@ -16,11 +16,19 @@
use core::{fmt, convert::From};
use bitcoin_internals::debug_from_display;
// Note: I am deliberately not implementing PartialOrd or Ord on the
// opcode enum. If you want to check ranges of opcodes, etc.,
// write an #[inline] helper function which casts to u8s.
/// A script Opcode.
///
/// We do not implement Ord on this type because there is no natural ordering on opcodes, but there
/// may appear to be one (e.g. because all the push opcodes appear in a consecutive block) and we
/// don't want to encourage subtly buggy code. Please use [`All::classify`] to distinguish different
/// types of opcodes.
///
/// <details>
/// <summary>Example of Core bug caused by assuming ordering</summary>
///
/// Bitcoin Core's `IsPushOnly` considers `OP_RESERVED` to be a "push code", allowing this opcode
/// in contexts where only pushes are supposed to be allowed.
/// </details>
#[derive(Copy, Clone, PartialEq, Eq)]
pub struct All {
code: u8,
@ -29,10 +37,14 @@ pub struct All {
// private import so we don't have to use `all::OP_FOO` in this file.
use self::all::*;
/// Enables wildcard imports to bring into scope all opcodes and nothing else.
///
/// The `all` module is provided so one can use a wildcard import `use bitcoin::opcodes::all::*` to
/// get all the `OP_FOO` opcodes without getting other types defined in `opcodes` (e.g. `All`, `Class`).
///
/// This module is guaranteed to never contain anything except opcode constants and all opcode
/// constants are guaranteed to begin with OP_.
pub mod all {
//! Constants associated with All type
use super::All;
/// Push an empty array onto the stack.