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#pragma once
#include <variant>
#include <vector>
#include "error.h"
namespace saw {
/**
* Container with a simplistic approach to a tree
*/
template<typename T>
class tree;
/**
* Branch object holding sub trees
*/
template<typename T>
class branch final {
private:
std::vector<tree<T>> children_;
public:
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();
try {
children_.push_back(std::move(leaf));
}catch(const std::exception& e){
(void)e;
return make_error<err::critical>();
}
return index;
}
error_or<std::size_t> add() {
std::size_t index = size();
try {
children_.push_back(branch{});
}catch(const std::exception& e){
(void)e;
return make_error<err::critical>();
}
return index;
}
std::size_t size() const {
return children_.size();
}
tree<T>& at(std::size_t i){
return children_.at(i);
}
const tree<T>& at(std::size_t i) const {
return children_.at(i);
}
};
template<typename T>
class tree final {
private:
using type = std::variant<branch<T>,T>;
type tov_;
friend class branch<T>;
public:
tree():tov_{branch<T>{}}{}
tree(branch<T> nd):tov_{std::move(nd)}{}
tree(T val):tov_{std::move(val)}{}
template<typename NT>
bool is() const {
return std::holds_alternative<NT>(tov_);
}
bool is_branch() const {
return std::holds_alternative<branch>(tov_);
}
bool is_value() const {
return std::holds_alternative<T>(tov_);
}
template<typename NT>
NT& get() {
return std::get<NT>(tov_);
}
template<typename NT>
const NT& get() const {
return std::get<NT>(tov_);
}
branch<T>& get_branch(){
return std::get<branch<T>>(tov_);
}
const branch<T>& get_branch() const {
return std::get<branch<T>>(tov_);
}
T& get_value(){
return std::get<T>(tov_);
}
const T& get_value() const {
return std::get<T>(tov_);
}
template<typename NT>
error_or<NT> extract(){
if(!is<NT>()){
return make_error<err::invalid_state>();
}
NT nd = std::move(std::get<NT>(tov_));
tov_ = branch<T>{};
return nd;
}
template<typename NT>
error_or<NT> replace(type nd){
auto eon = extract<NT>();
if(eon.is_error()){
return eon;
}
tov_ = std::move(nd);
return eon;
}
error_or<branch<T>> extract_branch() {
return extract<branch<T>>();
}
error_or<branch<T>> replace_branch(type nd){
return replace<branch<T>>(std::move(nd));
}
error_or<T> extract_value() {
return extract<T>();
}
error_or<T> replace_value(type nd){
return replace<T>(std::move(nd));
}
};
}
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