Fix const correctness of virtual methods for GDAL 3.12 (#70)

Author: rouault

source/ogrgrass.h

@@ -36,11 +36,20 @@ class OGRGRASSLayer final : public OGRLayer
     virtual ~OGRGRASSLayer();
 
     // Layer info
+#if GDAL_VERSION_NUM >= GDAL_COMPUTE_VERSION(3,12,0)
+    auto GetName() const -> const char * override
+#else
     auto GetName() -> const char * override
+#endif
     {
         return osName.c_str();
     }
+
+#if GDAL_VERSION_NUM >= GDAL_COMPUTE_VERSION(3,12,0)
+    auto GetLayerDefn() const -> const OGRFeatureDefn * override
+#else
     auto GetLayerDefn() -> OGRFeatureDefn * override
+#endif
     {
         return poFeatureDefn;
     }
@@ -58,8 +67,13 @@ class OGRGRASSLayer final : public OGRLayer
     }
 #endif
 
-    virtual auto GetSpatialRef() -> OGRSpatialReference * override;
+#if GDAL_VERSION_NUM >= GDAL_COMPUTE_VERSION(3,12,0)
+    auto GetSpatialRef() const -> const OGRSpatialReference * override;
+    auto TestCapability(const char *) const -> int override;
+#else
+    auto GetSpatialRef() -> OGRSpatialReference * override;
     auto TestCapability(const char *) -> int override;
+#endif
 
     // Reading
     void ResetReading() override;
@@ -145,13 +159,23 @@ class OGRGRASSDataSource final : public OGRDataSource
     {
         return osName.c_str();
     }
+
+#if GDAL_VERSION_NUM >= GDAL_COMPUTE_VERSION(3,12,0)
+    auto GetLayerCount() const -> int override
+#else
     auto GetLayerCount() -> int override
+#endif
     {
         return nLayers;
     }
-    auto GetLayer(int) -> OGRLayer * override;
 
+#if GDAL_VERSION_NUM >= GDAL_COMPUTE_VERSION(3,12,0)
+    auto GetLayer(int) const -> const OGRLayer * override;
+    auto TestCapability(const char *) const -> int override;
+#else
+    auto GetLayer(int) -> OGRLayer * override;
     auto TestCapability(const char *) -> int override;
+#endif
 
   private:
     OGRGRASSLayer **papoLayers{nullptr};

source/ogrgrassdatasource.cpp

@@ -186,15 +186,23 @@ auto OGRGRASSDataSource::Open(const char *pszNewName, bool /*bUpdate*/,
 /************************************************************************/
 /*                           TestCapability()                           */
 /************************************************************************/
+#if GDAL_VERSION_NUM >= GDAL_COMPUTE_VERSION(3,12,0)
+auto OGRGRASSDataSource::TestCapability(const char * /* pszCap*/) const -> int
+#else
 auto OGRGRASSDataSource::TestCapability(const char * /* pszCap*/) -> int
+#endif
 {
     return FALSE;
 }
 
 /************************************************************************/
 /*                              GetLayer()                              */
 /************************************************************************/
+#if GDAL_VERSION_NUM >= GDAL_COMPUTE_VERSION(3,12,0)
+auto OGRGRASSDataSource::GetLayer(int iLayer) const -> const OGRLayer *
+#else
 auto OGRGRASSDataSource::GetLayer(int iLayer) -> OGRLayer *
+#endif
 {
     if (iLayer < 0 || iLayer >= nLayers)
         return nullptr;

source/ogrgrasslayer.cpp

@@ -1088,7 +1088,11 @@ auto OGRGRASSLayer::GetExtent(OGREnvelope *psExtent, int /*bForce*/) -> OGRErr
 /************************************************************************/
 /*                           TestCapability()                           */
 /************************************************************************/
+#if GDAL_VERSION_NUM >= GDAL_COMPUTE_VERSION(3,12,0)
+auto OGRGRASSLayer::TestCapability(const char *pszCap) const -> int
+#else
 auto OGRGRASSLayer::TestCapability(const char *pszCap) -> int
+#endif
 {
     if (EQUAL(pszCap, OLCRandomRead))
         return TRUE;
@@ -1112,7 +1116,11 @@ auto OGRGRASSLayer::TestCapability(const char *pszCap) -> int
 /************************************************************************/
 /*                           GetSpatialRef()                            */
 /************************************************************************/
+#if GDAL_VERSION_NUM >= GDAL_COMPUTE_VERSION(3,12,0)
+auto OGRGRASSLayer::GetSpatialRef() const -> const OGRSpatialReference *
+#else
 auto OGRGRASSLayer::GetSpatialRef() -> OGRSpatialReference *
+#endif
 {
     return poSRS;
 }