try to add some const-correctness

(bzr r12719)

4 files changed, 9 insertions, 2 deletions

diff --git a/src/document.cpp b/src/document.cpp
index e1df38da1..3433e42ec 100644
--- a/src/document.cpp
+++ b/src/document.cpp
@@ -559,7 +559,7 @@ SPDocument *SPDocument::doUnref()
 }
 
 /// guaranteed not to return nullptr
-Inkscape::Util::Unit const* SPDocument::getDefaultUnit()
+Inkscape::Util::Unit const* SPDocument::getDefaultUnit() const
 {
     SPNamedView const* nv = sp_document_namedview(this, NULL);
     return nv ? nv->getDefaultUnit() : unit_table.getUnit("pt");
diff --git a/src/document.h b/src/document.h
index 6982e4c4f..0977fc7a8 100644
--- a/src/document.h
+++ b/src/document.h
@@ -124,6 +124,7 @@ public:
 
     /** Returns our SPRoot */
     SPRoot *getRoot() { return root; }
+    SPRoot const *getRoot() const { return root; }
 
     Inkscape::XML::Node *getReprRoot() { return rroot; }
 
@@ -228,7 +229,7 @@ public:
 
     SPDocument *doRef();
     SPDocument *doUnref();
-    Inkscape::Util::Unit const* getDefaultUnit();
+    Inkscape::Util::Unit const* getDefaultUnit() const;
     Inkscape::Util::Quantity getWidth() const;
     Inkscape::Util::Quantity getHeight() const;
     Geom::Point getDimensions() const;
diff --git a/src/sp-namedview.cpp b/src/sp-namedview.cpp
index ad497ff2f..a01ba891e 100644
--- a/src/sp-namedview.cpp
+++ b/src/sp-namedview.cpp
@@ -1073,6 +1073,11 @@ SPNamedView *sp_document_namedview(SPDocument *document, const gchar *id)
     return (SPNamedView *) nv;
 }
 
+SPNamedView const *sp_document_namedview(SPDocument const *document, const gchar *id)
+{
+    return sp_document_namedview(const_cast<SPDocument *>(document), id);  // use a const_cast here to avoid duplicating code
+}
+
 void SPNamedView::setGuides(bool v)
 {
     g_assert(this->getRepr() != NULL);
diff --git a/src/sp-namedview.h b/src/sp-namedview.h
index 00302e9a1..05cbcc398 100644
--- a/src/sp-namedview.h
+++ b/src/sp-namedview.h
@@ -110,6 +110,7 @@ protected:
 
 
 SPNamedView *sp_document_namedview(SPDocument *document, gchar const *name);
+SPNamedView const *sp_document_namedview(SPDocument const *document, gchar const *name);
 
 void sp_namedview_window_from_document(SPDesktop *desktop);
 void sp_namedview_document_from_window(SPDesktop *desktop);