[CI] Upgrade to clang-format 18

.github/workflows/ci.yml

@@ -726,7 +726,7 @@ jobs:
 
   format:
     name: Format
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
     - uses: actions/checkout@v4
     - name: setup

CHANGELOG.md

@@ -18,6 +18,9 @@ Increment the:
 * [SDK] Update ExemplarFilter and ExemplarReservoir for spec
   [#2372](https://github.com/open-telemetry/opentelemetry-cpp/pull/2372)
 
+* [CI] Upgrade to clang-format 18
+  [#2684](https://github.com/open-telemetry/opentelemetry-cpp/pull/2684)
+
 Notes on experimental features:
 
 * [#2372](https://github.com/open-telemetry/opentelemetry-cpp/issues/2372)

api/include/opentelemetry/common/kv_properties.h

@@ -158,7 +158,7 @@ class KeyValueProperties
     }
 
     // Move contructor and assignment operator
-    Entry(Entry &&other) = default;
+    Entry(Entry &&other)            = default;
     Entry &operator=(Entry &&other) = default;
 
     // Creates an Entry for a given key-value pair.

api/include/opentelemetry/common/spin_lock_mutex.h

@@ -53,8 +53,8 @@ class SpinLockMutex
 {
 public:
   SpinLockMutex() noexcept {}
-  ~SpinLockMutex() noexcept            = default;
-  SpinLockMutex(const SpinLockMutex &) = delete;
+  ~SpinLockMutex() noexcept                       = default;
+  SpinLockMutex(const SpinLockMutex &)            = delete;
   SpinLockMutex &operator=(const SpinLockMutex &) = delete;
 
   static inline void fast_yield() noexcept

api/include/opentelemetry/logs/event_logger.h

@@ -56,7 +56,7 @@ class EventLogger
    *  span<pair<string_view, AttributeValue>> -> attributes(return type of MakeAttributes)
    */
   template <class... ArgumentType>
-  void EmitEvent(nostd::string_view event_name, ArgumentType &&... args)
+  void EmitEvent(nostd::string_view event_name, ArgumentType &&...args)
   {
     nostd::shared_ptr<Logger> delegate_logger = GetDelegateLogger();
     if (!delegate_logger)

api/include/opentelemetry/logs/logger.h

@@ -65,7 +65,7 @@ class Logger
    *  span<pair<string_view, AttributeValue>> -> attributes(return type of MakeAttributes)
    */
   template <class... ArgumentType>
-  void EmitLogRecord(nostd::unique_ptr<LogRecord> &&log_record, ArgumentType &&... args)
+  void EmitLogRecord(nostd::unique_ptr<LogRecord> &&log_record, ArgumentType &&...args)
   {
     if (!log_record)
     {
@@ -97,7 +97,7 @@ class Logger
    *  span<pair<string_view, AttributeValue>> -> attributes(return type of MakeAttributes)
    */
   template <class... ArgumentType>
-  void EmitLogRecord(ArgumentType &&... args)
+  void EmitLogRecord(ArgumentType &&...args)
   {
     nostd::unique_ptr<LogRecord> log_record = CreateLogRecord();
 
@@ -120,7 +120,7 @@ class Logger
    *  span<pair<string_view, AttributeValue>> -> attributes(return type of MakeAttributes)
    */
   template <class... ArgumentType>
-  void Trace(ArgumentType &&... args) noexcept
+  void Trace(ArgumentType &&...args) noexcept
   {
     static_assert(
         !detail::LogRecordHasType<Severity, typename std::decay<ArgumentType>::type...>::value,
@@ -144,7 +144,7 @@ class Logger
    *  span<pair<string_view, AttributeValue>> -> attributes(return type of MakeAttributes)
    */
   template <class... ArgumentType>
-  void Debug(ArgumentType &&... args) noexcept
+  void Debug(ArgumentType &&...args) noexcept
   {
     static_assert(
         !detail::LogRecordHasType<Severity, typename std::decay<ArgumentType>::type...>::value,
@@ -168,7 +168,7 @@ class Logger
    *  span<pair<string_view, AttributeValue>> -> attributes(return type of MakeAttributes)
    */
   template <class... ArgumentType>
-  void Info(ArgumentType &&... args) noexcept
+  void Info(ArgumentType &&...args) noexcept
   {
     static_assert(
         !detail::LogRecordHasType<Severity, typename std::decay<ArgumentType>::type...>::value,
@@ -192,7 +192,7 @@ class Logger
    *  span<pair<string_view, AttributeValue>> -> attributes(return type of MakeAttributes)
    */
   template <class... ArgumentType>
-  void Warn(ArgumentType &&... args) noexcept
+  void Warn(ArgumentType &&...args) noexcept
   {
     static_assert(
         !detail::LogRecordHasType<Severity, typename std::decay<ArgumentType>::type...>::value,
@@ -216,7 +216,7 @@ class Logger
    *  span<pair<string_view, AttributeValue>> -> attributes(return type of MakeAttributes)
    */
   template <class... ArgumentType>
-  void Error(ArgumentType &&... args) noexcept
+  void Error(ArgumentType &&...args) noexcept
   {
     static_assert(
         !detail::LogRecordHasType<Severity, typename std::decay<ArgumentType>::type...>::value,
@@ -240,7 +240,7 @@ class Logger
    *  span<pair<string_view, AttributeValue>> -> attributes(return type of MakeAttributes)
    */
   template <class... ArgumentType>
-  void Fatal(ArgumentType &&... args) noexcept
+  void Fatal(ArgumentType &&...args) noexcept
   {
     static_assert(
         !detail::LogRecordHasType<Severity, typename std::decay<ArgumentType>::type...>::value,

api/include/opentelemetry/logs/provider.h

@@ -73,8 +73,8 @@ class OPENTELEMETRY_EXPORT Provider
     return provider;
   }
 
-  OPENTELEMETRY_API_SINGLETON static nostd::shared_ptr<EventLoggerProvider>
-      &GetEventProvider() noexcept
+  OPENTELEMETRY_API_SINGLETON static nostd::shared_ptr<EventLoggerProvider> &
+  GetEventProvider() noexcept
   {
     static nostd::shared_ptr<EventLoggerProvider> provider(new NoopEventLoggerProvider);
     return provider;

api/include/opentelemetry/nostd/detail/functional.h

@@ -7,8 +7,11 @@
 
 #include "opentelemetry/version.h"
 
-#define OPENTELEMETRY_RETURN(...) \
-  noexcept(noexcept(__VA_ARGS__))->decltype(__VA_ARGS__) { return __VA_ARGS__; }
+#define OPENTELEMETRY_RETURN(...)                        \
+  noexcept(noexcept(__VA_ARGS__))->decltype(__VA_ARGS__) \
+  {                                                      \
+    return __VA_ARGS__;                                  \
+  }
 
 OPENTELEMETRY_BEGIN_NAMESPACE
 namespace nostd

api/include/opentelemetry/nostd/detail/invoke.h

@@ -10,8 +10,11 @@
 #include "opentelemetry/nostd/detail/void.h"
 #include "opentelemetry/version.h"
 
-#define OPENTELEMETRY_RETURN(...) \
-  noexcept(noexcept(__VA_ARGS__))->decltype(__VA_ARGS__) { return __VA_ARGS__; }
+#define OPENTELEMETRY_RETURN(...)                        \
+  noexcept(noexcept(__VA_ARGS__))->decltype(__VA_ARGS__) \
+  {                                                      \
+    return __VA_ARGS__;                                  \
+  }
 
 OPENTELEMETRY_BEGIN_NAMESPACE
 namespace nostd
@@ -34,23 +37,23 @@ template <>
 struct Invoke<true /* pmf */, 0 /* is_base_of */>
 {
   template <typename R, typename T, typename Arg, typename... Args>
-  inline static constexpr auto invoke(R T::*pmf, Arg &&arg, Args &&... args)
+  inline static constexpr auto invoke(R T::*pmf, Arg &&arg, Args &&...args)
       OPENTELEMETRY_RETURN((std::forward<Arg>(arg).*pmf)(std::forward<Args>(args)...))
 };
 
 template <>
 struct Invoke<true /* pmf */, 1 /* is_reference_wrapper */>
 {
   template <typename R, typename T, typename Arg, typename... Args>
-  inline static constexpr auto invoke(R T::*pmf, Arg &&arg, Args &&... args)
+  inline static constexpr auto invoke(R T::*pmf, Arg &&arg, Args &&...args)
       OPENTELEMETRY_RETURN((std::forward<Arg>(arg).get().*pmf)(std::forward<Args>(args)...))
 };
 
 template <>
 struct Invoke<true /* pmf */, 2 /* otherwise */>
 {
   template <typename R, typename T, typename Arg, typename... Args>
-  inline static constexpr auto invoke(R T::*pmf, Arg &&arg, Args &&... args)
+  inline static constexpr auto invoke(R T::*pmf, Arg &&arg, Args &&...args)
       OPENTELEMETRY_RETURN(((*std::forward<Arg>(arg)).*pmf)(std::forward<Args>(args)...))
 };
 
@@ -79,20 +82,21 @@ struct Invoke<false /* pmo */, 2 /* otherwise */>
 };
 
 template <typename R, typename T, typename Arg, typename... Args>
-inline constexpr auto invoke_impl(R T::*f, Arg &&arg, Args &&... args)
-    OPENTELEMETRY_RETURN(Invoke<std::is_function<R>::value,
-                                (std::is_base_of<T, decay_t<Arg>>::value
-                                     ? 0
-                                     : is_reference_wrapper<decay_t<Arg>>::value ? 1 : 2)>::
-                             invoke(f, std::forward<Arg>(arg), std::forward<Args>(args)...))
+inline constexpr auto invoke_impl(R T::*f, Arg &&arg, Args &&...args) OPENTELEMETRY_RETURN(
+    Invoke<std::is_function<R>::value,
+           (std::is_base_of<T, decay_t<Arg>>::value     ? 0
+            : is_reference_wrapper<decay_t<Arg>>::value ? 1
+                                                        : 2)>::invoke(f,
+                                                                      std::forward<Arg>(arg),
+                                                                      std::forward<Args>(args)...))
 
 #ifdef _MSC_VER
 #  pragma warning(push)
 #  pragma warning(disable : 4100)
 #endif
-        template <typename F, typename... Args>
-        inline constexpr auto invoke_impl(F &&f, Args &&... args)
-            OPENTELEMETRY_RETURN(std::forward<F>(f)(std::forward<Args>(args)...))
+    template <typename F, typename... Args>
+    inline constexpr auto invoke_impl(F &&f, Args &&...args)
+        OPENTELEMETRY_RETURN(std::forward<F>(f)(std::forward<Args>(args)...))
 #ifdef _MSC_VER
 #  pragma warning(pop)
 #endif

api/include/opentelemetry/nostd/detail/trait.h

@@ -27,9 +27,9 @@ template <typename T,
           class IsAvailable>
 inline constexpr Trait trait()
 {
-  return IsTriviallyAvailable<T>::value
-             ? Trait::TriviallyAvailable
-             : IsAvailable<T>::value ? Trait::Available : Trait::Unavailable;
+  return IsTriviallyAvailable<T>::value ? Trait::TriviallyAvailable
+         : IsAvailable<T>::value        ? Trait::Available
+                                        : Trait::Unavailable;
 }
 
 inline constexpr Trait common_trait_impl(Trait result)

api/include/opentelemetry/nostd/unique_ptr.h

@@ -96,7 +96,7 @@ class unique_ptr
     return *this;
   }
 
-  operator std::unique_ptr<T>() &&noexcept { return std::unique_ptr<T>{release()}; }
+  operator std::unique_ptr<T>() && noexcept { return std::unique_ptr<T>{release()}; }
 
   operator bool() const noexcept { return ptr_ != nullptr; }
 

api/include/opentelemetry/nostd/utility.h

@@ -63,7 +63,7 @@ auto size(const C &c) noexcept(noexcept(c.size())) -> decltype(c.size())
 }
 
 template <class T, size_t N>
-size_t size(T (&/* array */)[N]) noexcept
+size_t size(T (& /* array */)[N]) noexcept
 {
   return N;
 }

api/include/opentelemetry/plugin/hook.h

@@ -16,13 +16,13 @@
  * library and a dynamically loaded plugin. The weak linkage allows for multiple implementations to
  * be linked in without getting multiple definition errors.
  */
-#  define OPENTELEMETRY_DEFINE_PLUGIN_HOOK(X)                                            \
-    extern "C" {                                                                         \
-    extern __declspec(dllexport)                                                         \
-        opentelemetry::plugin::OpenTelemetryHook const OpenTelemetryMakeFactoryImpl;     \
-                                                                                         \
-    __declspec(selectany)                                                                \
-        opentelemetry::plugin::OpenTelemetryHook const OpenTelemetryMakeFactoryImpl = X; \
+#  define OPENTELEMETRY_DEFINE_PLUGIN_HOOK(X)                                   \
+    extern "C" {                                                                \
+    extern __declspec(dllexport) opentelemetry::plugin::OpenTelemetryHook const \
+        OpenTelemetryMakeFactoryImpl;                                           \
+                                                                                \
+    __declspec(selectany) opentelemetry::plugin::OpenTelemetryHook const        \
+        OpenTelemetryMakeFactoryImpl = X;                                       \
     }  // extern "C"
 
 #else

api/include/opentelemetry/std/utility.h

@@ -54,7 +54,7 @@ auto size(const C &c) noexcept(noexcept(c.size())) -> decltype(c.size())
 }
 
 template <class T, std::size_t N>
-std::size_t size(T (&/* array */)[N]) noexcept
+std::size_t size(T (& /* array */)[N]) noexcept
 {
   return N;
 }

api/include/opentelemetry/std/variant.h

@@ -56,8 +56,7 @@ class bad_variant_access : public std::exception
 // nostd::get<...> for Apple Clang
 //
 template <typename T, class... Types>
-constexpr auto get_type = [](auto &&t) constexpr -> decltype(auto)
-{
+constexpr auto get_type = [](auto &&t) constexpr -> decltype(auto) {
   auto v      = t;
   auto result = std::get_if<T>(&v);  // TODO: optimize with std::forward(t) if t is not rvalue
   if (result)
@@ -69,8 +68,7 @@ constexpr auto get_type = [](auto &&t) constexpr -> decltype(auto)
 };
 
 template <std::size_t I, class... Types>
-constexpr auto get_index = [](auto &&t) constexpr -> decltype(auto)
-{
+constexpr auto get_index = [](auto &&t) constexpr -> decltype(auto) {
   auto v      = t;
   auto result = std::get_if<I>(&v);  // TODO: optimize with std::forward(t) if t is not rvalue
   if (result)
@@ -132,7 +130,7 @@ constexpr const T &&get(const std::variant<Types...> &&v)
 };
 
 template <class _Callable, class... _Variants>
-constexpr auto visit(_Callable &&_Obj, _Variants &&... _Args)
+constexpr auto visit(_Callable &&_Obj, _Variants &&..._Args)
 {
   // Ref:
   // https://stackoverflow.com/questions/52310835/xcode-10-call-to-unavailable-function-stdvisit
@@ -193,7 +191,7 @@ constexpr const T &&get(const std::variant<Types...> &&v)
 }
 
 template <class _Callable, class... _Variants>
-constexpr auto visit(_Callable &&_Obj, _Variants &&... _Args)
+constexpr auto visit(_Callable &&_Obj, _Variants &&..._Args)
 {
   return std::visit<_Callable, _Variants...>(static_cast<_Callable &&>(_Obj),
                                              static_cast<_Variants &&>(_Args)...);

api/include/opentelemetry/trace/span.h

@@ -62,10 +62,10 @@ class Span
   virtual ~Span() = default;
 
   // Not copiable or movable.
-  Span(const Span &) = delete;
-  Span(Span &&)      = delete;
+  Span(const Span &)            = delete;
+  Span(Span &&)                 = delete;
   Span &operator=(const Span &) = delete;
-  Span &operator=(Span &&) = delete;
+  Span &operator=(Span &&)      = delete;
 
   /**
    * Sets an attribute on the Span (ABI).

api/include/opentelemetry/trace/tracer.h

@@ -66,7 +66,7 @@ class Tracer
   template <class T,
             class U,
             nostd::enable_if_t<common::detail::is_key_value_iterable<T>::value> * = nullptr,
-            nostd::enable_if_t<detail::is_span_context_kv_iterable<U>::value> *   = nullptr>
+            nostd::enable_if_t<detail::is_span_context_kv_iterable<U>::value>   * = nullptr>
   nostd::shared_ptr<Span> StartSpan(nostd::string_view name,
                                     const T &attributes,
                                     const U &links,

api/test/common/spinlock_benchmark.cc

@@ -56,8 +56,7 @@ inline void SpinThrash(benchmark::State &s, SpinLockType &spinlock, LockF lock,
 static void BM_SpinLockThrashing(benchmark::State &s)
 {
   SpinLockMutex spinlock;
-  SpinThrash(
-      s, spinlock, [](SpinLockMutex &m) { m.lock(); }, [](SpinLockMutex &m) { m.unlock(); });
+  SpinThrash(s, spinlock, [](SpinLockMutex &m) { m.lock(); }, [](SpinLockMutex &m) { m.unlock(); });
 }
 
 // Naive `while(try_lock()) {}` implementation of lock.

api/test/nostd/shared_ptr_test.cc

@@ -129,8 +129,7 @@ TEST(SharedPtrTest, PointerOperators)
   shared_ptr<int> ptr1{value};
 
   EXPECT_EQ(&*ptr1, value);
-  EXPECT_EQ(
-      shared_ptr<B> { new B }->f(), 123);
+  EXPECT_EQ(shared_ptr<B> { new B } -> f(), 123);
 }
 
 TEST(SharedPtrTest, Swap)

api/test/nostd/unique_ptr_test.cc

@@ -114,8 +114,7 @@ TEST(UniquePtrTest, PointerOperators)
   unique_ptr<int> ptr1{value};
 
   EXPECT_EQ(&*ptr1, value);
-  EXPECT_EQ(
-      unique_ptr<B> { new B }->f(), 123);
+  EXPECT_EQ(unique_ptr<B> { new B } -> f(), 123);
 }
 
 TEST(UniquePtrTest, Reset)

api/test/singleton/component_g.cc

@@ -34,7 +34,8 @@ extern "C"
     __declspec(dllexport)
 #endif
 
-        void do_something_in_g()
+    void
+    do_something_in_g()
 {
   auto scoped_span = trace::Scope(get_tracer()->StartSpan("G::library"));
 

api/test/singleton/component_h.cc

@@ -35,12 +35,13 @@ extern "C"
     __declspec(dllexport)
 
 #else
-// component_h is a shared library (*.so)
-// component_h is compiled with visibility("hidden"),
-__attribute__((visibility("default")))
+    // component_h is a shared library (*.so)
+    // component_h is compiled with visibility("hidden"),
+    __attribute__((visibility("default")))
 #endif
 
-        void do_something_in_h()
+    void
+    do_something_in_h()
 {
   auto scoped_span = trace::Scope(get_tracer()->StartSpan("H::library"));