refactor: C++20 operators #33771

pull purpleKarrot wants to merge 2 commits into bitcoin:master from purpleKarrot:cxx20-operators changing 14 files +7 −106
  1. purpleKarrot commented at 1:49 pm on November 3, 2025: contributor

    Remove all operator!= definitions and provide operator<=> as a replacement where all relational comparison operators were defined before.

    The compiler is able to deduce missing comparison operators from operator!= and operator<=>. The compiler provided operators have the following advantages:

    1. less code
    2. guaranteed consistency

    Refactoring that changes the implementation, or replaces it with = default is left for a separate PR.

  2. refactor: Remove all `operator!=` definitions 
    The compiler can deduce `operator!=` from `operator==`.
    5a0f49bd26
  3. refactor: Prefer `<=>` over multiple relational operators 
    Define `operator<=>` in classes that have all of `<`, `<=`, `>`, `>=`.
    48840bfc2d
  4. DrahtBot added the label Refactoring on Nov 3, 2025
  5. DrahtBot commented at 1:49 pm on November 3, 2025: contributor

    The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

    Code Coverage & Benchmarks

    For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/33771.

    Reviews

    See the guideline for information on the review process.

    Type Reviewers
    ACK stickies-v, optout21, janb84, Chand-ra, maflcko, sipa

    If your review is incorrectly listed, please copy-paste <!–meta-tag:bot-skip–> into the comment that the bot should ignore.

    Conflicts

    Reviewers, this pull request conflicts with the following ones:

    • #33772 (prevector: simplify implementation of comparison operators and match behavior of std::vector by purpleKarrot)
    • #33711 (transaction: Adding script witness to ToString for CTxIn by Ataraxia009)

    If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

  6. in src/script/script.h:273 in 48840bfc2d 
    269@@ -270,18 +270,10 @@ class CScriptNum
270     }
271 
272     inline bool operator==(const int64_t& rhs) const    { return m_value == rhs; }
273-    inline bool operator!=(const int64_t& rhs) const    { return m_value != rhs; }
274-    inline bool operator<=(const int64_t& rhs) const    { return m_value <= rhs; }
275-    inline bool operator< (const int64_t& rhs) const    { return m_value <  rhs; }
276-    inline bool operator>=(const int64_t& rhs) const    { return m_value >= rhs; }
277-    inline bool operator> (const int64_t& rhs) const    { return m_value >  rhs; }
278+    inline auto operator<=>(const int64_t& rhs) const    { return m_value <=> rhs; }
    stickies-v commented at 4:19 pm on November 3, 2025:

    nit (here and for all other new operator<=>): perhaps better to be explicit about the std::strong_ordering return type? And perhaps making it constexpr while touching?

      0diff --git a/src/prevector.h b/src/prevector.h
  1index d4d90c7350..595be4a603 100644
  2--- a/src/prevector.h
  3+++ b/src/prevector.h
  4@@ -7,6 +7,7 @@
  5 
  6 #include <algorithm>
  7 #include <cassert>
  8+#include <compare>
  9 #include <cstddef>
 10 #include <cstdint>
 11 #include <cstdlib>
 12@@ -71,8 +72,8 @@ public:
 13         iterator& operator+=(size_type n) { ptr += n; return *this; }
 14         iterator operator-(size_type n) const { return iterator(ptr - n); }
 15         iterator& operator-=(size_type n) { ptr -= n; return *this; }
 16-        bool operator==(iterator x) const { return ptr == x.ptr; }
 17-        auto operator<=>(iterator x) const { return ptr <=> x.ptr; }
 18+        constexpr bool operator==(iterator x) const { return ptr == x.ptr; }
 19+        constexpr std::strong_ordering operator<=>(iterator x) const { return ptr <=> x.ptr; }
 20     };
 21 
 22     class const_iterator {
 23@@ -99,8 +100,8 @@ public:
 24         const_iterator& operator+=(size_type n) { ptr += n; return *this; }
 25         const_iterator operator-(size_type n) const { return const_iterator(ptr - n); }
 26         const_iterator& operator-=(size_type n) { ptr -= n; return *this; }
 27-        bool operator==(const_iterator x) const { return ptr == x.ptr; }
 28-        auto operator<=>(const_iterator x) const { return ptr <=> x.ptr; }
 29+        constexpr bool operator==(const_iterator x) const { return ptr == x.ptr; }
 30+        constexpr std::strong_ordering operator<=>(const_iterator x) const { return ptr <=> x.ptr; }
 31     };
 32 
 33 private:
 34diff --git a/src/script/script.h b/src/script/script.h
 35index b06be9c975..f1472a7dd3 100644
 36--- a/src/script/script.h
 37+++ b/src/script/script.h
 38@@ -14,6 +14,7 @@
 39 #include <util/hash_type.h>
 40 
 41 #include <cassert>
 42+#include <compare>
 43 #include <cstdint>
 44 #include <cstring>
 45 #include <limits>
 46@@ -269,11 +270,11 @@ public:
 47         m_value = set_vch(vch);
 48     }
 49 
 50-    inline bool operator==(const int64_t& rhs) const    { return m_value == rhs; }
 51-    inline auto operator<=>(const int64_t& rhs) const    { return m_value <=> rhs; }
 52+    inline constexpr bool operator==(const int64_t& rhs) const    { return m_value == rhs; }
 53+    inline constexpr std::strong_ordering operator<=>(const int64_t& rhs) const    { return m_value <=> rhs; }
 54 
 55-    inline bool operator==(const CScriptNum& rhs) const { return operator==(rhs.m_value); }
 56-    inline auto operator<=>(const CScriptNum& rhs) const { return operator<=>(rhs.m_value); }
 57+    inline constexpr bool operator==(const CScriptNum& rhs) const { return operator==(rhs.m_value); }
 58+    inline constexpr std::strong_ordering operator<=>(const CScriptNum& rhs) const { return operator<=>(rhs.m_value); }
 59 
 60     inline CScriptNum operator+(   const int64_t& rhs)    const { return CScriptNum(m_value + rhs);}
 61     inline CScriptNum operator-(   const int64_t& rhs)    const { return CScriptNum(m_value - rhs);}
 62diff --git a/src/test/scriptnum10.h b/src/test/scriptnum10.h
 63index 402606714d..fd112d6ff7 100644
 64--- a/src/test/scriptnum10.h
 65+++ b/src/test/scriptnum10.h
 66@@ -7,6 +7,7 @@
 67 #define BITCOIN_TEST_SCRIPTNUM10_H
 68 
 69 #include <cassert>
 70+#include <compare>
 71 #include <cstdint>
 72 #include <limits>
 73 #include <stdexcept>
 74@@ -60,11 +61,11 @@ public:
 75         m_value = set_vch(vch);
 76     }
 77 
 78-    inline bool operator==(const int64_t& rhs) const    { return m_value == rhs; }
 79-    inline auto operator<=>(const int64_t& rhs) const    { return m_value <=> rhs; }
 80+    inline constexpr bool operator==(const int64_t& rhs) const    { return m_value == rhs; }
 81+    inline constexpr std::strong_ordering operator<=>(const int64_t& rhs) const    { return m_value <=> rhs; }
 82 
 83-    inline bool operator==(const CScriptNum10& rhs) const { return operator==(rhs.m_value); }
 84-    inline auto operator<=>(const CScriptNum10& rhs) const { return operator<=>(rhs.m_value); }
 85+    inline constexpr bool operator==(const CScriptNum10& rhs) const { return operator==(rhs.m_value); }
 86+    inline constexpr std::strong_ordering operator<=>(const CScriptNum10& rhs) const { return operator<=>(rhs.m_value); }
 87 
 88     inline CScriptNum10 operator+(   const int64_t& rhs)    const { return CScriptNum10(m_value + rhs);}
 89     inline CScriptNum10 operator-(   const int64_t& rhs)    const { return CScriptNum10(m_value - rhs);}
 90diff --git a/src/util/bitdeque.h b/src/util/bitdeque.h
 91index 21934e02da..be3e0fd859 100644
 92--- a/src/util/bitdeque.h
 93+++ b/src/util/bitdeque.h
 94@@ -6,6 +6,7 @@
 95 #define BITCOIN_UTIL_BITDEQUE_H
 96 
 97 #include <bitset>
 98+#include <compare>
 99 #include <cstddef>
100 #include <deque>
101 #include <limits>
102@@ -99,8 +100,8 @@ class bitdeque
103         friend Iterator operator+(Iterator x, difference_type dist) { x += dist; return x; }
104         friend Iterator operator+(difference_type dist, Iterator x) { x += dist; return x; }
105         friend Iterator operator-(Iterator x, difference_type dist) { x -= dist; return x; }
106-        friend auto operator<=>(const Iterator& x, const Iterator& y) { return std::tie(x.m_it, x.m_bitpos) <=> std::tie(y.m_it, y.m_bitpos); }
107-        friend bool operator==(const Iterator& x, const Iterator& y) { return x.m_it == y.m_it && x.m_bitpos == y.m_bitpos; }
108+        friend constexpr std::strong_ordering operator<=>(const Iterator& x, const Iterator& y) { return std::tie(x.m_it, x.m_bitpos) <=> std::tie(y.m_it, y.m_bitpos); }
109+        friend constexpr bool operator==(const Iterator& x, const Iterator& y) { return x.m_it == y.m_it && x.m_bitpos == y.m_bitpos; }
110         reference operator*() const { return (*m_it)[m_bitpos]; }
111         reference operator[](difference_type pos) const { return *(*this + pos); }
112     };
    purpleKarrot commented at 5:23 pm on November 3, 2025:

    Thanks @stickies-v.

    I am not convinced about std::strong_ordering. constexpr will definitely be added as a follow up, together with = default where appropriate.

  7. stickies-v approved
  8. stickies-v commented at 4:19 pm on November 3, 2025: contributor
    utACK 48840bfc2d7beeac0ddf56a3c26b243156ec8936. Pretty straightforward cleanup taking advantage of C++20 improvements, nice.
  9. optout21 commented at 2:37 pm on November 11, 2025: none

    utACK 48840bfc2d7beeac0ddf56a3c26b243156ec8936

    Straightforward refactoring resulting in code removal 😎 First commit removes != operator where == exits. Second commit replaces 4 comparison operators with the new <=> spaceship operator. My only concern is that competence with the new <=> operator may not be extensive across the developer community of this project, but hey, it’s time to learn!

  10. optout21 commented at 2:38 pm on November 11, 2025: none
    I wonder whether it would it be possible check for superfluous comparison operator implementations in linting?
  11. janb84 commented at 3:40 pm on December 1, 2025: contributor

    ACK 48840bfc2d7beeac0ddf56a3c26b243156ec8936

    Reducing custom handwritten boilerplate and replacing it with modern idioms is not something we should shun to do (imho). Using the spaceship operation <=> will use the compiler to generate the other operators correctly.

    Was a bit worried that the spaceship did not yet land on apple clang, given the documentation

    But it compiles fine on MacOS 26 :

     0
 1100% tests passed, 0 tests failed out of 134
 2
 3Total Test time (real) =  82.35 sec
 4
 5The following tests did not run:
 6         89 - script_assets_tests (Skipped)
 7arjan@M1-Max bitcoin % utest
 8zsh: command not found: utest
 9arjan@M1-Max bitcoin % ./build/bin/test_bitcoin
10Running 625 test cases...
11
12*** No errors detected

    This line makes me unsure if the support is there for older systems:

    Guix (SKD 15) also builds fine:

    Host architecture: aarch64 Commit: 48840bfc2d7b

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 2 364f8b5fed3df38c4e5e0f36081ea0ab752e1d842ee6aa8ef79630b644865dfd guix-build-48840bfc2d7b/output/aarch64-linux-gnu/bitcoin-48840bfc2d7b-aarch64-linux-gnu.tar.gz 
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28 0924cd8c4ba99b2be857d494be2d32ed6bd134cfe99b8b7b9c53a0abfa095956 guix-build-48840bfc2d7b/output/x86_64-w64-mingw32/bitcoin-48840bfc2d7b-win64-unsigned.zip

    benchmarks: this PR:

    ns/op op/s err% total benchmark
    3.66 273,207,365.58 0.9% 0.01 PrevectorClearNontrivial
    5.47 182,981,087.16 1.9% 0.01 PrevectorClearTrivial
    221.03 4,524,203.13 1.3% 0.01 PrevectorDeserializeNontrivial
    12.88 77,654,787.98 1.0% 0.01 PrevectorDeserializeTrivial
    - - - - :boom: PrevectorDestructorNontrivial (iterations overflow. Maybe your code got optimized away?)
    - - - - :boom: PrevectorDestructorTrivial (iterations overflow. Maybe your code got optimized away?)
    1,148.86 870,426.34 1.5% 0.01 PrevectorFillVectorDirectNontrivial
    297.98 3,355,948.40 1.2% 0.01 PrevectorFillVectorDirectTrivial
    4,150.18 240,953.25 0.3% 0.01 PrevectorFillVectorIndirectNontrivial
    4,003.70 249,768.73 4.7% 0.01 PrevectorFillVectorIndirectTrivial
    1.89 528,716,700.36 0.6% 0.01 PrevectorResizeNontrivial
    2.85 350,494,388.31 0.4% 0.01 PrevectorResizeTrivial
    ns/job job/s err% total benchmark
    225.66 4,431,399.41 4.6% 0.09 CCheckQueueSpeedPrevectorJob

    Master:

    ns/op op/s err% total benchmark
    3.63 275,735,101.26 0.1% 0.01 PrevectorClearNontrivial
    5.32 187,794,641.77 0.1% 0.01 PrevectorClearTrivial
    219.86 4,548,382.05 0.9% 0.01 PrevectorDeserializeNontrivial
    11.71 85,371,714.77 0.8% 0.01 PrevectorDeserializeTrivial
    - - - - :boom: PrevectorDestructorNontrivial (iterations overflow. Maybe your code got optimized away?)
    - - - - :boom: PrevectorDestructorTrivial (iterations overflow. Maybe your code got optimized away?)
    1,372.81 728,434.76 3.6% 0.01 PrevectorFillVectorDirectNontrivial
    315.76 3,166,924.15 2.1% 0.01 PrevectorFillVectorDirectTrivial
    4,324.56 231,237.32 1.2% 0.01 PrevectorFillVectorIndirectNontrivial
    3,856.83 259,280.23 1.1% 0.01 PrevectorFillVectorIndirectTrivial
    1.85 539,265,429.27 0.3% 0.01 PrevectorResizeNontrivial
    2.72 367,563,122.86 0.6% 0.01 PrevectorResizeTrivial
    ns/job job/s err% total benchmark
    258.39 3,870,177.88 4.8% 0.10 CCheckQueueSpeedPrevectorJob
  12. fanquake requested review from maflcko on Dec 5, 2025
  13. Chand-ra commented at 8:37 am on December 8, 2025: none

    tACK 48840bf. Built the PR and ran unit tests; everything passes.

    Verified that all instances of operator!= have been removed and operator<=> replaces combined implementations of <, <=, >, and >=. (Note: PR #33772 and not this one gets rid of operator< in src/prevector.h.)

  14. maflcko commented at 3:54 pm on December 8, 2025: member

    review ACK 48840bfc2d7beeac0ddf56a3c26b243156ec8936 🌖

    Signature:

    0untrusted comment: signature from minisign secret key on empty file; verify via: minisign -Vm "${path_to_any_empty_file}" -P RWTRmVTMeKV5noAMqVlsMugDDCyyTSbA3Re5AkUrhvLVln0tSaFWglOw -x "${path_to_this_whole_four_line_signature_blob}"
1RUTRmVTMeKV5npGrKx1nqXCw5zeVHdtdYURB/KlyA/LMFgpNCs+SkW9a8N95d+U4AP1RJMi+krxU1A3Yux4bpwZNLvVBKy0wLgM=
2trusted comment: review ACK 48840bfc2d7beeac0ddf56a3c26b243156ec8936 🌖
3RJCzzHS7aZcc9j1dS+BlIns6fkD9vUnjg/5rVEcIpZ07JGtNbdDramcmgcbbznLHZYBJgSUdVocxGNYeupAnCw==
  15. sipa commented at 4:36 pm on December 8, 2025: member

    ACK 48840bfc2d7beeac0ddf56a3c26b243156ec8936

    ultra-nit: I think the commit message “The compiler can deduce” is misleading. Of course it can, but the point isn’t that it can, it’s that the language spec says it must.

  16. fanquake merged this on Dec 8, 2025
  17. fanquake closed this on Dec 8, 2025
  18. maflcko commented at 12:37 pm on December 9, 2025: member

    I think there are some missed cases. It could make sense to include them in a follow-up?

     0diff --git a/src/kernel/bitcoinkernel_wrapper.h b/src/kernel/bitcoinkernel_wrapper.h
 1index 3fb90da7a9..055ea83808 100644
 2--- a/src/kernel/bitcoinkernel_wrapper.h
 3+++ b/src/kernel/bitcoinkernel_wrapper.h
 4@@ -465,14 +465,9 @@ private:
 5     TxidApi() = default;
 6 
 7 public:
 8-    bool operator==(const TxidApi& other) const
 9+    friend bool operator==(const Derived& lhs, const Derived& rhs)
10     {
11-        return btck_txid_equals(impl(), other.impl()) != 0;
12-    }
13-
14-    bool operator!=(const TxidApi& other) const
15-    {
16-        return btck_txid_equals(impl(), other.impl()) == 0;
17+        return btck_txid_equals(lhs.get(), rhs.get()) != 0;
18     }
19 
20     std::array<std::byte, 32> ToBytes() const
21@@ -665,14 +660,9 @@ private:
22     }
23 
24 public:
25-    bool operator==(const Derived& other) const
26-    {
27-        return btck_block_hash_equals(impl(), other.get()) != 0;
28-    }
29-
30-    bool operator!=(const Derived& other) const
31+    friend bool operator==(const Derived& lhs, const Derived& rhs)
32     {
33-        return btck_block_hash_equals(impl(), other.get()) == 0;
34+        return btck_block_hash_equals(lhs.get(), rhs.get()) != 0;
35     }
36 
37     std::array<std::byte, 32> ToBytes() const


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