diff --git a/src/headers/parsing/ParseComponents.hpp b/src/headers/parsing/ParseComponents.hpp
index 9770e0f..d385c1e 100644
--- a/src/headers/parsing/ParseComponents.hpp
+++ b/src/headers/parsing/ParseComponents.hpp
@@ -11,7 +11,7 @@ class ParseComponent {};
 
 struct ParseTree: public ParseComponent {
 private:
-    unsigned int compCount = 0;
+    mutable unsigned int compCount = 0;
 protected:
     vector<ParseComponent> subComponents;
 public:
@@ -20,6 +20,8 @@ public:
     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); }
     ParseTree(): subComponents() {};
     ~ParseTree() = default;
 };