diff --git a/.github/workflows/clang_format.yml b/.github/workflows/clang_format.yml
index 61f7d0afaea..3ec2ecf0245 100644
--- a/.github/workflows/clang_format.yml
+++ b/.github/workflows/clang_format.yml
@@ -20,13 +20,13 @@ jobs:
           # This LLVM script will add the relevant LLVM PPA: https://apt.llvm.org/
           wget https://apt.llvm.org/llvm.sh -O /tmp/llvm.sh
           chmod +x /tmp/llvm.sh
-          sudo /tmp/llvm.sh 18
-          sudo apt-get install -y clang-format-18
+          sudo /tmp/llvm.sh 19
+          sudo apt-get install -y clang-format-19
           rm /tmp/llvm.sh
-          clang-format-18 --version
+          clang-format-19 --version
         if: runner.os == 'Linux'
 
       - name: Run Clang Format
         run: |
-          find . -name "*.h" -o -name "*.c" -o -name "*.cpp" -o -name "*.mm" | xargs clang-format-18 --style=file --fallback-style=none --Werror --dry-run
-          find cpp -name "*.m" | xargs clang-format-18 --style=file --fallback-style=none --Werror --dry-run
+          find . -name "*.h" -o -name "*.c" -o -name "*.cpp" -o -name "*.mm" | xargs clang-format-19 --style=file --fallback-style=none --Werror --dry-run
+          find cpp -name "*.m" | xargs clang-format-19 --style=file --fallback-style=none --Werror --dry-run
diff --git a/cpp/doxygen/examples/Ice/SSL/OpenSSLServerAuthenticationOptions.cpp b/cpp/doxygen/examples/Ice/SSL/OpenSSLServerAuthenticationOptions.cpp
index 1ffbdaef053..9aa0b6c3bc3 100644
--- a/cpp/doxygen/examples/Ice/SSL/OpenSSLServerAuthenticationOptions.cpp
+++ b/cpp/doxygen/examples/Ice/SSL/OpenSSLServerAuthenticationOptions.cpp
@@ -37,7 +37,8 @@ serverSetNewSessionCallbackExample()
         "Hello",
         "ssl -h 127.0.0.1 -p 10000",
         Ice::SSL::ServerAuthenticationOptions{
-            .sslNewSessionCallback = [](SSL* ssl, const std::string&) {
+            .sslNewSessionCallback = [](SSL* ssl, const std::string&)
+            {
                 SSL_set_verify(ssl, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, 0);
             }});
     //! [sslNewSessionCallback]
diff --git a/cpp/include/Ice/MetricsAdminI.h b/cpp/include/Ice/MetricsAdminI.h
index 289a6588ab3..a063c6ac934 100644
--- a/cpp/include/Ice/MetricsAdminI.h
+++ b/cpp/include/Ice/MetricsAdminI.h
@@ -107,7 +107,7 @@ namespace IceInternal
         using TPtr = std::shared_ptr<MetricsType>;
         using MetricsMapTPtr = std::shared_ptr<MetricsMapT>;
 
-        typedef IceMX::MetricsMap MetricsType::*SubMapMember;
+        typedef IceMX::MetricsMap MetricsType::* SubMapMember;
 
         class EntryT;
         using EntryTPtr = std::shared_ptr<EntryT>;
@@ -488,7 +488,7 @@ namespace IceInternal
         }
 
         template<class SubMapMetricsType>
-        void registerSubMap(const std::string& subMap, IceMX::MetricsMap MetricsType::*member)
+        void registerSubMap(const std::string& subMap, IceMX::MetricsMap MetricsType::* member)
         {
             _subMaps[subMap] = std::pair<IceMX::MetricsMap MetricsType::*, MetricsMapFactoryPtr>(
                 member,
@@ -554,7 +554,7 @@ namespace IceInternal
         }
 
         template<class MemberMetricsType, class MetricsType>
-        void registerSubMap(const std::string& map, const std::string& subMap, IceMX::MetricsMap MetricsType::*member)
+        void registerSubMap(const std::string& map, const std::string& subMap, IceMX::MetricsMap MetricsType::* member)
         {
             bool updated;
             std::shared_ptr<MetricsMapFactoryT<MetricsType>> factory;
diff --git a/cpp/include/Ice/MetricsFunctional.h b/cpp/include/Ice/MetricsFunctional.h
index de5db75e34c..f7b5db4dd25 100644
--- a/cpp/include/Ice/MetricsFunctional.h
+++ b/cpp/include/Ice/MetricsFunctional.h
@@ -44,12 +44,12 @@ namespace IceMX
     /// \cond INTERNAL
     template<class T, typename Y, typename Func> struct ApplyOnMember
     {
-        ApplyOnMember(Y T::*m, Func f) : func(f), member(m) {}
+        ApplyOnMember(Y T::* m, Func f) : func(f), member(m) {}
 
         template<typename R> void operator()(const R& v) { func(IceInternal::ReferenceWrapper<R>::get(v)->*member); }
 
         Func func;
-        Y T::*member;
+        Y T::* member;
     };
 
     template<typename T> struct Decrement
@@ -71,22 +71,22 @@ namespace IceMX
         T value;
     };
 
-    template<class T, typename Y, typename F> ApplyOnMember<T, Y, F> applyOnMember(Y T::*member, F func)
+    template<class T, typename Y, typename F> ApplyOnMember<T, Y, F> applyOnMember(Y T::* member, F func)
     {
         return ApplyOnMember<T, Y, F>(member, func);
     }
 
-    template<class T, typename Y, typename V> ApplyOnMember<T, Y, Add<V>> add(Y T::*member, V value)
+    template<class T, typename Y, typename V> ApplyOnMember<T, Y, Add<V>> add(Y T::* member, V value)
     {
         return applyOnMember(member, Add<V>(value));
     }
 
-    template<class T, typename Y> ApplyOnMember<T, Y, Increment<Y>> inc(Y T::*member)
+    template<class T, typename Y> ApplyOnMember<T, Y, Increment<Y>> inc(Y T::* member)
     {
         return applyOnMember(member, Increment<Y>());
     }
 
-    template<class T, typename Y> ApplyOnMember<T, Y, Decrement<Y>> dec(Y T::*member)
+    template<class T, typename Y> ApplyOnMember<T, Y, Decrement<Y>> dec(Y T::* member)
     {
         return applyOnMember(member, Decrement<Y>());
     }
diff --git a/cpp/include/Ice/MetricsObserverI.h b/cpp/include/Ice/MetricsObserverI.h
index 923d55ceca1..8a67399e1f2 100644
--- a/cpp/include/Ice/MetricsObserverI.h
+++ b/cpp/include/Ice/MetricsObserverI.h
@@ -110,7 +110,7 @@ namespace IceMX
 
             void setDefault(std::string (Helper::*memberFn)(const std::string&) const) { _default = memberFn; }
 
-            template<typename Y> void add(const std::string& name, Y Helper::*member)
+            template<typename Y> void add(const std::string& name, Y Helper::* member)
             {
                 _attributes.insert(typename std::map<std::string, Resolver*>::value_type(
                     name,
@@ -125,7 +125,7 @@ namespace IceMX
             }
 
             template<typename I, typename O, typename Y>
-            void add(const std::string& name, O (Helper::*getFn)() const, Y I::*member)
+            void add(const std::string& name, O (Helper::*getFn)() const, Y I::* member)
             {
                 _attributes.insert(typename std::map<std::string, Resolver*>::value_type(
                     name,
@@ -156,12 +156,12 @@ namespace IceMX
             template<typename Y> class HelperMemberResolver : public Resolver
             {
             public:
-                HelperMemberResolver(const std::string& name, Y Helper::*member) : Resolver(name), _member(member) {}
+                HelperMemberResolver(const std::string& name, Y Helper::* member) : Resolver(name), _member(member) {}
 
                 virtual std::string operator()(const Helper* r) const { return toString(r->*_member); }
 
             private:
-                Y Helper::*_member;
+                Y Helper::* _member;
             };
 
             template<typename Y> class HelperMemberFunctionResolver : public Resolver
@@ -182,7 +182,7 @@ namespace IceMX
             template<typename I, typename O, typename Y> class MemberResolver : public Resolver
             {
             public:
-                MemberResolver(const std::string& name, O (Helper::*getFn)() const, Y I::*member)
+                MemberResolver(const std::string& name, O (Helper::*getFn)() const, Y I::* member)
                     : Resolver(name),
                       _getFn(getFn),
                       _member(member)
@@ -205,7 +205,7 @@ namespace IceMX
 
             private:
                 O (Helper::*_getFn)() const;
-                Y I::*_member;
+                Y I::* _member;
             };
 
             template<typename I, typename O, typename Y> class MemberFunctionResolver : public Resolver
@@ -521,7 +521,7 @@ namespace IceMX
         }
 
         template<typename SubMapMetricsType>
-        void registerSubMap(const std::string& subMap, MetricsMap MetricsType::*member)
+        void registerSubMap(const std::string& subMap, MetricsMap MetricsType::* member)
         {
             assert(_metrics);
             _metrics->registerSubMap<SubMapMetricsType>(_name, subMap, member);
diff --git a/cpp/src/Ice/ConnectionI.cpp b/cpp/src/Ice/ConnectionI.cpp
index f84bd315a55..8355068e2fe 100644
--- a/cpp/src/Ice/ConnectionI.cpp
+++ b/cpp/src/Ice/ConnectionI.cpp
@@ -1467,7 +1467,8 @@ Ice::ConnectionI::message(ThreadPoolCurrent& current)
              connectionStartCompleted = std::move(connectionStartCompleted),
              sentCBs = std::move(sentCBs),
              messageUpcall = std::move(messageUpcall),
-             stream]() {
+             stream]()
+            {
                 self->upcall(
                     std::move(connectionStartCompleted),
                     std::move(sentCBs),
diff --git a/cpp/src/Ice/InstrumentationI.cpp b/cpp/src/Ice/InstrumentationI.cpp
index 1654fa80feb..328666f5b26 100644
--- a/cpp/src/Ice/InstrumentationI.cpp
+++ b/cpp/src/Ice/InstrumentationI.cpp
@@ -20,7 +20,7 @@ using namespace IceMX;
 
 namespace
 {
-    int ThreadMetrics::*getThreadStateMetric(ThreadState s)
+    int ThreadMetrics::* getThreadStateMetric(ThreadState s)
     {
         switch (s)
         {
diff --git a/cpp/src/Ice/OutputUtil.h b/cpp/src/Ice/OutputUtil.h
index d869efdc43b..d604a8fb61b 100644
--- a/cpp/src/Ice/OutputUtil.h
+++ b/cpp/src/Ice/OutputUtil.h
@@ -69,14 +69,10 @@ namespace IceInternal
         bool _separator;
     };
 
-    class ICE_API NextLine
-    {
-    };
+    class ICE_API NextLine{};
     extern ICE_API NextLine nl;
 
-    class ICE_API Separator
-    {
-    };
+    class ICE_API Separator{};
     extern ICE_API Separator sp;
 
     // ----------------------------------------------------------------------
@@ -136,9 +132,7 @@ namespace IceInternal
         return o;
     }
 
-    class ICE_API StartBlock
-    {
-    };
+    class ICE_API StartBlock{};
     extern ICE_API StartBlock sb;
 
     template<> inline Output& operator<<(Output& o, const StartBlock&)
@@ -147,9 +141,7 @@ namespace IceInternal
         return o;
     }
 
-    class ICE_API EndBlock
-    {
-    };
+    class ICE_API EndBlock{};
     extern ICE_API EndBlock eb;
 
     template<> inline Output& operator<<(Output& o, const EndBlock&)
@@ -158,9 +150,7 @@ namespace IceInternal
         return o;
     }
 
-    class ICE_API StartPar
-    {
-    };
+    class ICE_API StartPar{};
     extern ICE_API StartPar spar;
 
     template<> inline Output& operator<<(Output& o, const StartPar&)
@@ -169,9 +159,7 @@ namespace IceInternal
         return o;
     }
 
-    class ICE_API EndPar
-    {
-    };
+    class ICE_API EndPar{};
     extern ICE_API EndPar epar;
 
     template<> inline Output& operator<<(Output& o, const EndPar&)
@@ -180,9 +168,7 @@ namespace IceInternal
         return o;
     }
 
-    class ICE_API StartAbrk
-    {
-    };
+    class ICE_API StartAbrk{};
     extern ICE_API StartAbrk sabrk;
 
     template<> inline Output& operator<<(Output& o, const StartAbrk&)
@@ -191,9 +177,7 @@ namespace IceInternal
         return o;
     }
 
-    class ICE_API EndAbrk
-    {
-    };
+    class ICE_API EndAbrk{};
     extern ICE_API EndAbrk eabrk;
 
     template<> inline Output& operator<<(Output& o, const EndAbrk&)
@@ -259,9 +243,7 @@ namespace IceInternal
         return o;
     }
 
-    class ICE_API EndElement
-    {
-    };
+    class ICE_API EndElement{};
     extern ICE_API EndElement ee;
 
     template<> inline XMLOutput& operator<<(XMLOutput& o, const EndElement&)
@@ -310,14 +292,10 @@ namespace IceInternal
         return o;
     }
 
-    class ICE_API StartEscapes
-    {
-    };
+    class ICE_API StartEscapes{};
     extern ICE_API StartEscapes startEscapes;
 
-    class ICE_API EndEscapes
-    {
-    };
+    class ICE_API EndEscapes{};
     extern ICE_API EndEscapes endEscapes;
 
     template<> inline XMLOutput& operator<<(XMLOutput& o, const StartEscapes&)
diff --git a/cpp/test/ios/controller/Classes/AppDelegate.m b/cpp/test/ios/controller/Classes/AppDelegate.m
index e16ba6e02f8..9d82a3b43d3 100644
--- a/cpp/test/ios/controller/Classes/AppDelegate.m
+++ b/cpp/test/ios/controller/Classes/AppDelegate.m
@@ -4,8 +4,7 @@
 
 #import "AppDelegate.h"
 
-@interface
-AppDelegate ()
+@interface AppDelegate ()
 
 @end
 
diff --git a/swift/src/IceImpl/include/Communicator.h b/swift/src/IceImpl/include/Communicator.h
index 6d7998351a2..db714df0e01 100644
--- a/swift/src/IceImpl/include/Communicator.h
+++ b/swift/src/IceImpl/include/Communicator.h
@@ -60,8 +60,7 @@ ICEIMPL_API @interface ICECommunicator : ICELocalObject
 
 #ifdef __cplusplus
 
-@interface
-ICECommunicator ()
+@interface ICECommunicator ()
 @property(nonatomic, readonly) std::shared_ptr<Ice::Communicator> communicator;
 @end
 
diff --git a/swift/src/IceImpl/include/Connection.h b/swift/src/IceImpl/include/Connection.h
index 11ada38e9d2..134f551a3f3 100644
--- a/swift/src/IceImpl/include/Connection.h
+++ b/swift/src/IceImpl/include/Connection.h
@@ -96,8 +96,7 @@ ICEIMPL_API @protocol ICEConnectionInfoFactory
 
 id createConnectionInfo(std::shared_ptr<Ice::ConnectionInfo>);
 
-@interface
-ICEConnection ()
+@interface ICEConnection ()
 @property(nonatomic, readonly) std::shared_ptr<Ice::Connection> connection;
 @end
 
diff --git a/swift/src/IceImpl/include/Endpoint.h b/swift/src/IceImpl/include/Endpoint.h
index a831317549b..2b04e9f0876 100644
--- a/swift/src/IceImpl/include/Endpoint.h
+++ b/swift/src/IceImpl/include/Endpoint.h
@@ -70,14 +70,12 @@ ICEIMPL_API @protocol ICEEndpointInfoFactory
 
 #ifdef __cplusplus
 
-@interface
-ICEEndpoint ()
+@interface ICEEndpoint ()
 @property(nonatomic, readonly) std::shared_ptr<Ice::Endpoint> endpoint;
 + (nullable ICEEndpointInfo*)createEndpointInfo:(std::shared_ptr<Ice::EndpointInfo>)infoPtr NS_RETURNS_RETAINED;
 @end
 
-@interface
-ICEEndpointInfo ()
+@interface ICEEndpointInfo ()
 @property(nonatomic, readonly) std::shared_ptr<Ice::EndpointInfo> info;
 @end
 
diff --git a/swift/src/IceImpl/include/ImplicitContext.h b/swift/src/IceImpl/include/ImplicitContext.h
index b2aaea6fefa..c380c615035 100644
--- a/swift/src/IceImpl/include/ImplicitContext.h
+++ b/swift/src/IceImpl/include/ImplicitContext.h
@@ -14,8 +14,7 @@ ICEIMPL_API @interface ICEImplicitContext : ICELocalObject
 
 #ifdef __cplusplus
 
-@interface
-ICEImplicitContext ()
+@interface ICEImplicitContext ()
 @property(nonatomic, readonly) std::shared_ptr<Ice::ImplicitContext> implicitContext;
 @end
 
diff --git a/swift/src/IceImpl/include/LocalObject.h b/swift/src/IceImpl/include/LocalObject.h
index 844c9dbbb48..09e6bcab14f 100644
--- a/swift/src/IceImpl/include/LocalObject.h
+++ b/swift/src/IceImpl/include/LocalObject.h
@@ -14,8 +14,7 @@ ICEIMPL_API @interface ICELocalObject : NSObject
 
 #ifdef __cplusplus
 
-@interface
-ICELocalObject ()
+@interface ICELocalObject ()
 @property(nonatomic, readonly) std::shared_ptr<void> cppObject;
 + (nullable instancetype)getHandle:(std::shared_ptr<void>)cppObject NS_RETURNS_RETAINED;
 @end
diff --git a/swift/src/IceImpl/include/Logger.h b/swift/src/IceImpl/include/Logger.h
index 74c04e2db0c..5a805ebb487 100644
--- a/swift/src/IceImpl/include/Logger.h
+++ b/swift/src/IceImpl/include/Logger.h
@@ -23,8 +23,7 @@ ICEIMPL_API @interface ICELogger : ICELocalObject<ICELoggerProtocol>
 
 #ifdef __cplusplus
 
-@interface
-ICELogger ()
+@interface ICELogger ()
 @property(nonatomic, readonly) std::shared_ptr<Ice::Logger> logger;
 @end
 
diff --git a/swift/src/IceImpl/include/ObjectAdapter.h b/swift/src/IceImpl/include/ObjectAdapter.h
index 34163c4638b..ce59fd7e385 100644
--- a/swift/src/IceImpl/include/ObjectAdapter.h
+++ b/swift/src/IceImpl/include/ObjectAdapter.h
@@ -41,8 +41,7 @@ ICEIMPL_API @interface ICEObjectAdapter : ICELocalObject
 
 #ifdef __cplusplus
 
-@interface
-ICEObjectAdapter ()
+@interface ICEObjectAdapter ()
 @property(nonatomic, readonly) std::shared_ptr<Ice::ObjectAdapter> objectAdapter;
 @end
 
diff --git a/swift/src/IceImpl/include/ObjectPrx.h b/swift/src/IceImpl/include/ObjectPrx.h
index 5a4102e523b..15b4010d0a2 100644
--- a/swift/src/IceImpl/include/ObjectPrx.h
+++ b/swift/src/IceImpl/include/ObjectPrx.h
@@ -110,8 +110,7 @@ ICEIMPL_API @interface ICEObjectPrx : NSObject
 
 #ifdef __cplusplus
 
-@interface
-ICEObjectPrx ()
+@interface ICEObjectPrx ()
 // prx is always set; we just need a field with a default constructor.
 @property(nonatomic, readonly) std::optional<Ice::ObjectPrx> prx;
 - (nonnull instancetype)initWithCppObjectPrx:(const Ice::ObjectPrx&)prx;
diff --git a/swift/src/IceImpl/include/Process.h b/swift/src/IceImpl/include/Process.h
index 70a05c9381e..1be32de60d0 100644
--- a/swift/src/IceImpl/include/Process.h
+++ b/swift/src/IceImpl/include/Process.h
@@ -10,8 +10,7 @@ ICEIMPL_API @interface ICEProcess : ICELocalObject
 
 #ifdef __cplusplus
 
-@interface
-ICEProcess ()
+@interface ICEProcess ()
 @property(nonatomic, readonly) std::shared_ptr<Ice::Process> process;
 @end
 
diff --git a/swift/src/IceImpl/include/Properties.h b/swift/src/IceImpl/include/Properties.h
index 0b6afe8badc..47ddd12cf12 100644
--- a/swift/src/IceImpl/include/Properties.h
+++ b/swift/src/IceImpl/include/Properties.h
@@ -31,8 +31,7 @@ ICEIMPL_API @interface ICEProperties : ICELocalObject
 
 #ifdef __cplusplus
 
-@interface
-ICEProperties ()
+@interface ICEProperties ()
 @property(nonatomic, readonly) std::shared_ptr<Ice::Properties> properties;
 @end
 
diff --git a/swift/src/IceImpl/include/PropertiesAdmin.h b/swift/src/IceImpl/include/PropertiesAdmin.h
index d014ebfe7e0..ca97004766d 100644
--- a/swift/src/IceImpl/include/PropertiesAdmin.h
+++ b/swift/src/IceImpl/include/PropertiesAdmin.h
@@ -12,8 +12,7 @@ ICEIMPL_API @interface ICEPropertiesAdmin : ICELocalObject
 
 #ifdef __cplusplus
 
-@interface
-ICEPropertiesAdmin ()
+@interface ICEPropertiesAdmin ()
 @property(nonatomic, readonly) std::shared_ptr<Ice::PropertiesAdmin> propertiesAdmin;
 @end