small refactor public->protected

Param/Base/IParametricComponent.h

@@ -54,10 +54,10 @@ public:
     RealParameter*
     registeredParameter(const std::string& pattern) const; // #baPool + rename (hierarchy!)?
 
-    // #baPool public only for Python scripts (samplebuilder.py)
+protected:
+    //! Create and register a parameter with the given name for a double member.
     RealParameter& registerParameter(const std::string& name, double* parpointer);
 
-protected:
     // #baPool + docu
     RealParameter* parameter(const double* p) const;
 
@@ -116,6 +116,13 @@ protected:
     friend class IParametricComponentTest_fullQualifiedParameters_Test;
     friend class IParametricComponentTest_removeParameter_Test;
     friend class IParametricComponentTest_matchedParameters_Test;
+
+#ifndef SWIG
+    // necessary for Py implementation of sampleBuilder (see libBornAgainSample.i, director
+    // ISampleBuilder and the resulting method in libBornAgainSample_wrap.cpp)
+    friend RealParameter* ISampleBuilder_registerParameter(class ISampleBuilder*,
+                                                           std::string const&, int64_t);
+#endif // SWIG
 };
 
 #endif // BORNAGAIN_PARAM_BASE_IPARAMETRICCOMPONENT_H