Add access by char

include/core/state_block/has_state_blocks.h

@@ -44,13 +44,22 @@ class HasStateBlocks
         void unfix();
         bool isFixed() const;
 
-    protected:
+    public:
         StateBlockPtr setStateBlock(const std::string& _sb_type, const StateBlockPtr& _sb);
+        StateBlockPtr setStateBlock(const char& _sb_type, const StateBlockPtr& _sb)
+        {
+            return setStateBlock(std::string(1,_sb_type), _sb);
+        }
         StateBlockPtr getStateBlock(const std::string& _sb_type) const;
+        StateBlockPtr getStateBlock(const char& _sb_type) const {return getStateBlock(std::string(1,_sb_type));}
         unsigned int removeStateBlock(const std::string& _sb_type)
         {
             return state_block_map_.erase(_sb_type);
         }
+        unsigned int removeStateBlock(const char& _sb_type)
+        {
+            return removeStateBlock(std::string(1,_sb_type));
+        }
 
         // Emplace derived state blocks (angle, quaternion, etc).
         template<typename SB, typename ... Args>