diff --git a/src/headers/parsing/ParseComponents.hpp b/src/headers/parsing/ParseComponents.hpp
index d385c1e..c1bae05 100644
--- a/src/headers/parsing/ParseComponents.hpp
+++ b/src/headers/parsing/ParseComponents.hpp
@@ -12,16 +12,19 @@ class ParseComponent {};
 struct ParseTree: public ParseComponent {
 private:
     mutable unsigned int compCount = 0;
+    inline void addComp(const auto& comp) const {
+        subComponents.push_back(comp); ++compCount;
+    }; inline void addAllComps(auto& comps) { for (const auto& comp: comps) addComp(comp); }
 protected:
-    vector<ParseComponent> subComponents;
+    mutable vector<ParseComponent> subComponents;
 public:
-    unsigned int& getCompCount() { return compCount; }
-    auto& getComponents() { return subComponents; }
-    void add(const ParseComponent& component) { subComponents.push_back(component); ++compCount; };
-    void addAll(const vector<ParseComponent>& components) { for (const auto& comp: components) add(comp); }
-    void operator<<(const ParseComponent& component) { this->add(component); }
-    explicit ParseTree(const ParseComponent& element): subComponents() { *this << element; }
-    ParseTree(const initializer_list<ParseComponent>& elements): subComponents() { addAll(elements); }
+    unsigned int& getCompCount() const { return compCount; }
+    auto& getComponents() const { return subComponents; }
+    void add(const ParseComponent& component) { addComp(component); };
+    void addAll(const vector<ParseComponent>& components) {  }
+    void operator<<(const ParseComponent& component) { this->addComp(component); }
+    explicit ParseTree(const ParseComponent& element): subComponents() { addComp(element); }
+    ParseTree(const initializer_list<ParseComponent>& elements): subComponents() { addAllComps(elements); }
     ParseTree(): subComponents() {};
     ~ParseTree() = default;
 };