Added MeshTools::AbstractIndexTool, operating only on indices.

Doesn't need to be templated and thus leads to smaller generated code
size.

src/MeshBuilder.h

@@ -32,6 +32,7 @@ namespace Magnum {
 
 namespace MeshTools {
     template<class Vertex> class AbstractTool;
+    class AbstractIndexTool;
 }
 
 /**
@@ -46,6 +47,7 @@ MeshTools namespace.
 */
 template<class Vertex> class MeshBuilder {
     friend class MeshTools::AbstractTool<Vertex>;
+    friend class MeshTools::AbstractIndexTool;
 
     public:
 

src/MeshTools/AbstractTool.h

@@ -33,7 +33,8 @@ namespace MeshTools {
 /**
  * @brief Base class for mesh tools
  *
- * Provides access to internals of MeshBuilder instance for subclasses.
+ * Provides access to internals of MeshBuilder instance for subclasses. See
+ * also AbstractIndexTool.
  */
 template<class Vertex> class AbstractTool {
     public:
@@ -49,6 +50,25 @@ template<class Vertex> class AbstractTool {
         std::vector<unsigned int>& indices; /**< @brief Builder indices */
 };
 
+/**
+ * @brief Base class for mesh tools operating only on indices
+ *
+ * Provides access only to index array and vertex count. See also
+ * AbstractTool.
+ */
+class AbstractIndexTool {
+    public:
+        /**
+         * @brief Constructor
+         * @param builder   %Mesh builder to operate on
+         */
+        template<class Vertex> inline AbstractIndexTool(MeshBuilder<Vertex>& builder): indices(builder._indices), vertexCount(builder.vertexCount()) {}
+
+    protected:
+        std::vector<unsigned int>& indices; /**< @brief Builder indices */
+        const unsigned int vertexCount;     /**< @brief Count of builder vertices */
+};
+
 }}
 
 #endif