use MAYBE_UNUSED in the method declaration

Author: 3nids

src/core/qgseditformconfig.cpp

@@ -260,7 +260,7 @@ void QgsEditFormConfig::setSuppress( QgsEditFormConfig::FeatureFormSuppress s )
 
 void QgsEditFormConfig::readXml( const QDomNode &node, QgsReadWriteContext &context )
 {
-  MAYBE_UNUSED QgsReadWriteContextCategoryPopper p = context.enterCategory( QObject::tr( "Edit form config" ) );
+  QgsReadWriteContextCategoryPopper p = context.enterCategory( QObject::tr( "Edit form config" ) );
 
   d.detach();
 

src/core/qgsmaplayer.cpp

@@ -430,7 +430,7 @@ bool QgsMapLayer::readLayerXml( const QDomElement &layerElement,  QgsReadWriteCo
   // the subclass can also read custom properties
   readCustomProperties( layerElement );
 
-  MAYBE_UNUSED QgsReadWriteContextCategoryPopper p = context.enterCategory( tr( "Layer" ), mne.text() );
+  QgsReadWriteContextCategoryPopper p = context.enterCategory( tr( "Layer" ), mne.text() );
 
   // now let the children grab what they need from the Dom node.
   layerError = !readXml( layerElement, context );

src/core/qgsreadwritecontext.cpp

@@ -41,7 +41,7 @@ QgsReadWriteContextCategoryPopper QgsReadWriteContext::enterCategory( const QStr
   if ( !details.isEmpty() )
     message.append( QString( " :: %1" ).arg( details ) );
   mCategories.push_back( message );
-  return QgsReadWriteContextCategoryPopper( this );
+  return QgsReadWriteContextCategoryPopper( *this );
 }
 
 void QgsReadWriteContext::leaveCategory()

src/core/qgsreadwritecontext.h

@@ -88,7 +88,7 @@ class CORE_EXPORT QgsReadWriteContext
      * \note Not available in the Python bindings.
      * \since QGIS 3.2
      */
-    NODISCARD QgsReadWriteContextCategoryPopper enterCategory( const QString &category, const QString &details = QString() );
+    MAYBE_UNUSED NODISCARD QgsReadWriteContextCategoryPopper enterCategory( const QString &category, const QString &details = QString() );
 #endif
 
     /**
@@ -114,18 +114,10 @@ class CORE_EXPORT QgsReadWriteContext
 class QgsReadWriteContextCategoryPopper
 {
   public:
-
-    QgsReadWriteContextCategoryPopper( QgsReadWriteContext *context )
-      : mContext( context )
-    {}
-
-    ~QgsReadWriteContextCategoryPopper()
-    {
-      if ( mContext )
-        mContext->leaveCategory();
-    }
-
-    QgsReadWriteContext *mContext;
+    QgsReadWriteContextCategoryPopper( QgsReadWriteContext &context ) : mContext( context ) {}
+    ~QgsReadWriteContextCategoryPopper() {mContext.leaveCategory();}
+  private:
+    QgsReadWriteContext mContext;
 };
 ///@endcond PRIVATE
 #endif

src/core/qgsvectorlayer.cpp

@@ -1688,7 +1688,7 @@ void QgsVectorLayer::resolveReferences( QgsProject *project )
 
 bool QgsVectorLayer::readSymbology( const QDomNode &layerNode, QString &errorMessage, QgsReadWriteContext &context )
 {
-  MAYBE_UNUSED QgsReadWriteContextCategoryPopper p = context.enterCategory( tr( "Symbology" ) );
+  QgsReadWriteContextCategoryPopper p = context.enterCategory( tr( "Symbology" ) );
 
   if ( !mExpressionFieldBuffer )
     mExpressionFieldBuffer = new QgsExpressionFieldBuffer();