blob: 0ed7fe1d28fdf6aba0ffac400a95f5f1b3a73be6 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
#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));
}
};
}
|