1 files changed, 44 insertions, 25 deletions

diff --git a/c++/core/tree.h b/c++/core/tree.h
index 6ffd1f0..0ed7fe1 100644
--- a/c++/core/tree.h
+++ b/c++/core/tree.h
@@ -6,16 +6,35 @@
 #include "error.h"
 
 namespace saw {
+/**
+ * Container with a simplistic approach to a tree
+ */
 template<typename T>
-class tree_or;
+class tree;
 
+/**
+ * Branch object holding sub trees
+ */
 template<typename T>
-class tree final {
+class branch final {
 private:
-	std::vector<tree_or<T>> children_;
+	std::vector<tree<T>> children_;
 public:
-	tree() = default;
-	~tree() = default;
+	branch() = default;
+
+	~branch() = default;
+
+	error_or<void> reserve(std::size_t siz){
+		try{
+			children_.reserve(siz);
+		}catch(const std::exception& e){
+			(void) e;
+
+			return make_error<err::out_of_memory>();
+		}
+
+		return void_t{};
+	}
 
 	error_or<std::size_t> add(T leaf) {
 		std::size_t index = size();
@@ -33,7 +52,7 @@ public:
 	error_or<std::size_t> add() {
 		std::size_t index = size();
 		try {
-			children_.push_back(tree{});
+			children_.push_back(branch{});
 		}catch(const std::exception& e){
 			(void)e;
 
@@ -47,36 +66,36 @@ public:
 		return children_.size();
 	}
 
-	tree_or<T>& at(std::size_t i){
+	tree<T>& at(std::size_t i){
 		return children_.at(i);
 	}
 
-	const tree_or<T>& at(std::size_t i) const {
+	const tree<T>& at(std::size_t i) const {
 		return children_.at(i);
 	}
 };
 
 template<typename T>
-class tree_or final {
+class tree final {
 private:
-	using type = std::variant<tree<T>,T>;
+	using type = std::variant<branch<T>,T>;
 	type tov_;
 
-	friend class tree<T>;
+	friend class branch<T>;
 public:
-	tree_or():tov_{tree<T>{}}{}
+	tree():tov_{branch<T>{}}{}
 
-	tree_or(tree<T> nd):tov_{std::move(nd)}{}
+	tree(branch<T> nd):tov_{std::move(nd)}{}
 
-	tree_or(T val):tov_{std::move(val)}{}
+	tree(T val):tov_{std::move(val)}{}
 
 	template<typename NT>
 	bool is() const {
 		return std::holds_alternative<NT>(tov_);
 	}
 
-	bool is_tree() const {
-		return std::holds_alternative<tree>(tov_);
+	bool is_branch() const {
+		return std::holds_alternative<branch>(tov_);
 	}
 
 	bool is_value() const {
@@ -93,12 +112,12 @@ public:
 		return std::get<NT>(tov_);
 	}
 
-	tree<T>& get_tree(){
-		return std::get<tree>(tov_);
+	branch<T>& get_branch(){
+		return std::get<branch<T>>(tov_);
 	}
 
-	const tree<T>& get_tree() const {
-		return std::get<tree>(tov_);
+	const branch<T>& get_branch() const {
+		return std::get<branch<T>>(tov_);
 	}
 
 	T& get_value(){
@@ -116,7 +135,7 @@ public:
 		}
 		
 		NT nd = std::move(std::get<NT>(tov_));
-		tov_ = tree<T>{};
+		tov_ = branch<T>{};
 
 		return nd;
 	}
@@ -133,12 +152,12 @@ public:
 		return eon;
 	}
 
-	error_or<tree<T>> extract_tree() {
-		return extract<tree<T>>();
+	error_or<branch<T>> extract_branch() {
+		return extract<branch<T>>();
 	}
 
-	error_or<tree<T>> replace_tree(type nd){
-		return replace<tree<T>>(std::move(nd));
+	error_or<branch<T>> replace_branch(type nd){
+		return replace<branch<T>>(std::move(nd));
 	}
 
 	error_or<T> extract_value() {