Avoid some other lengthy lambdas in call_once

src/core/callouts/qgscallout.cpp

@@ -194,10 +194,7 @@ void QgsCallout::setEnabled( bool enabled )
 QgsPropertiesDefinition QgsCallout::propertyDefinitions()
 {
   static std::once_flag initialized;
-  std::call_once( initialized, [ = ]( )
-  {
-    initPropertyDefinitions();
-  } );
+  std::call_once( initialized, initPropertyDefinitions );
   return sPropertyDefinitions;
 }
 

src/core/network/qgsnetworkdiskcache.cpp

@@ -123,11 +123,7 @@ void QgsNetworkDiskCache::clear()
   return sDiskCache.clear();
 }
 
-qint64 QgsNetworkDiskCache::smartCacheSize( const QString &cacheDir )
-{
-  static qint64 cacheSize = 0;
-  static std::once_flag initialized;
-  std::call_once( initialized, [ = ]
+void determineSmartCacheSize( const QString &cacheDir, qint64 &cacheSize )
 {
   std::function<qint64( const QString & )> dirSize;
   dirSize = [&dirSize]( const QString & dirPath ) -> qint64
@@ -184,14 +180,19 @@ qint64 QgsNetworkDiskCache::smartCacheSize( const QString &cacheDir )
 
     // Add 16% of free space up to 500 MB
     cacheSize10MB += std::max( 2LL, static_cast<qint64>( available10MB * 0.16 ) );
-#else
+#else \
   // Add 30% of free space up to 500 MB
     cacheSize10MB += std::max( 5LL, static_cast<qint64>( available10MB * 0.30 ) );
 #endif
   }
   cacheSize = cacheSize10MB * 10 * 1024 * 1024;
   // NOLINTEND(bugprone-narrowing-conversions)
-  } );
-
-  return cacheSize;
+}
+
+qint64 QgsNetworkDiskCache::smartCacheSize( const QString &cacheDir )
+{
+  static qint64 sCacheSize = 0;
+  static std::once_flag initialized;
+  std::call_once( initialized, determineSmartCacheSize, cacheDir, sCacheSize );
+  return sCacheSize;
 }

src/core/providers/gdal/qgsgdalprovider.cpp

@@ -2961,7 +2961,7 @@ void buildSupportedRasterFileFilterAndExtensions( QString &fileFiltersString, QS
 
   QgsDebugMsgLevel( "Raster filter list built: " + fileFiltersString, 2 );
   QgsDebugMsgLevel( "Raster extension list built: " + extensions.join( ' ' ), 2 );
-}                               // buildSupportedRasterFileFilter_()
+}
 
 bool QgsGdalProvider::isValidRasterFileName( QString const &fileNameQString, QString &retErrMsg )
 {
@@ -4429,12 +4429,7 @@ QList<QgsProviderSublayerDetails> QgsGdalProviderMetadata::querySublayers( const
 
     // get supported extensions
     static std::once_flag initialized;
-    std::call_once( initialized, [ = ]
-    {
-      buildSupportedRasterFileFilterAndExtensions( sFilterString, sExtensions, sWildcards );
-      QgsDebugMsgLevel( QStringLiteral( "extensions: " ) + sExtensions.join( ' ' ), 2 );
-      QgsDebugMsgLevel( QStringLiteral( "wildcards: " ) + sWildcards.join( ' ' ), 2 );
-    } );
+    std::call_once( initialized, buildSupportedRasterFileFilterAndExtensions, sFilterString, sExtensions, sWildcards );
 
     const QString suffix = uriParts.value( QStringLiteral( "vsiSuffix" ) ).toString().isEmpty()
                            ? pathInfo.suffix().toLower()

src/core/qgsapplication.cpp

@@ -226,38 +226,7 @@ QgsApplication::QgsApplication( int &argc, char **argv, bool GUIenabled, const Q
 
 }
 
-void QgsApplication::init( QString profileFolder )
-{
-  // Initialize application members in desktop app (at this point, profile folder is known)
-  if ( platform() == QLatin1String( "desktop" ) )
-  {
-    instance()->mApplicationMembers = new ApplicationMembers();
-    instance()->mApplicationMembers->mSettingsRegistryCore->migrateOldSettings();
-  }
-
-  if ( profileFolder.isEmpty() )
-  {
-    if ( getenv( "QGIS_CUSTOM_CONFIG_PATH" ) )
-    {
-      profileFolder = getenv( "QGIS_CUSTOM_CONFIG_PATH" );
-    }
-    else
-    {
-      profileFolder = QStandardPaths::standardLocations( QStandardPaths::AppDataLocation ).value( 0 );
-    }
-    // This will normally get here for custom scripts that use QgsApplication.
-    // This doesn't get this hit for QGIS Desktop because we setup the profile via main
-    QString rootProfileFolder = QgsUserProfileManager::resolveProfilesFolder( profileFolder );
-    QgsUserProfileManager manager( rootProfileFolder );
-    QgsUserProfile *profile = manager.getProfile();
-    profileFolder = profile->folder();
-    delete profile;
-  }
-
-  *sProfilePath() = profileFolder;
-
-  static std::once_flag sMetaTypesRegistered;
-  std::call_once( sMetaTypesRegistered, []
+void registerMetaTypes()
 {
   qRegisterMetaType<QgsGeometry::Error>( "QgsGeometry::Error" );
   qRegisterMetaType<QgsDatabaseQueryLogEntry>( "QgsDatabaseQueryLogEntry" );
@@ -322,7 +291,40 @@ void QgsApplication::init( QString profileFolder )
   qRegisterMetaType< QAuthenticator * >( "QAuthenticator*" );
   qRegisterMetaType< QgsGpsInformation >( "QgsGpsInformation" );
   qRegisterMetaType< QgsSensorThingsExpansionDefinition >( "QgsSensorThingsExpansionDefinition" );
-  } );
+};
+
+void QgsApplication::init( QString profileFolder )
+{
+  // Initialize application members in desktop app (at this point, profile folder is known)
+  if ( platform() == QLatin1String( "desktop" ) )
+  {
+    instance()->mApplicationMembers = new ApplicationMembers();
+    instance()->mApplicationMembers->mSettingsRegistryCore->migrateOldSettings();
+  }
+
+  if ( profileFolder.isEmpty() )
+  {
+    if ( getenv( "QGIS_CUSTOM_CONFIG_PATH" ) )
+    {
+      profileFolder = getenv( "QGIS_CUSTOM_CONFIG_PATH" );
+    }
+    else
+    {
+      profileFolder = QStandardPaths::standardLocations( QStandardPaths::AppDataLocation ).value( 0 );
+    }
+    // This will normally get here for custom scripts that use QgsApplication.
+    // This doesn't get this hit for QGIS Desktop because we setup the profile via main
+    QString rootProfileFolder = QgsUserProfileManager::resolveProfilesFolder( profileFolder );
+    QgsUserProfileManager manager( rootProfileFolder );
+    QgsUserProfile *profile = manager.getProfile();
+    profileFolder = profile->folder();
+    delete profile;
+  }
+
+  *sProfilePath() = profileFolder;
+
+  static std::once_flag sMetaTypesRegistered;
+  std::call_once( sMetaTypesRegistered, registerMetaTypes );
 
   ( void ) resolvePkgPath();
 

src/core/qgsmaplayerelevationproperties.cpp

@@ -124,10 +124,7 @@ void QgsMapLayerElevationProperties::setDataDefinedProperties( const QgsProperty
 QgsPropertiesDefinition QgsMapLayerElevationProperties::propertyDefinitions()
 {
   static std::once_flag initialized;
-  std::call_once( initialized, [ = ]( )
-  {
-    initPropertyDefinitions();
-  } );
+  std::call_once( initialized, initPropertyDefinitions );
   return sPropertyDefinitions;
 }
 

src/core/raster/qgsrasterpipe.cpp

@@ -454,9 +454,6 @@ void QgsRasterPipe::initPropertyDefinitions()
 QgsPropertiesDefinition QgsRasterPipe::propertyDefinitions()
 {
   static std::once_flag initialized;
-  std::call_once( initialized, [ = ]( )
-  {
-    initPropertyDefinitions();
-  } );
+  std::call_once( initialized, initPropertyDefinitions );
   return sPropertyDefinitions;
 }