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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345
|
// Osman Zakir
// 9 / 7 / 2017
// Bjarne Stroustrup: Programming: Principles and Practice Using C++ 2nd Edition
// Chapter 17 Exercises 11-13
#include <iostream>
#include <vld.h>
#include "../../cust_std_lib_facilities.h"
struct God
{
God(const std::string &name, const std::string &myth, const std::string &vehicle, const std::string &weapon)
: m_name{ name }, m_myth{ myth }, m_vehicle{ vehicle }, m_weapon{ weapon } { }
std::string name() const { return m_name; }
std::string myth() const { return m_myth; }
std::string vehicle() const { return m_vehicle; }
std::string weapon() const { return m_weapon; }
void set_name(const std::string name) { m_name = name; }
void set_myth(const std::string myth) { m_myth = myth; }
void set_vehicle(const std::string vehicle) { m_vehicle = vehicle; }
void set_weapon(const std::string weapon) { m_weapon = weapon; }
private:
std::string m_name;
std::string m_myth;
std::string m_vehicle;
std::string m_weapon;
};
class Link
{
public:
Link(const God &god, Link *p = nullptr, Link *s = nullptr)
: m_god{ god }, m_prev{ p }, m_succ{ s } { }
~Link();
Link *insert(Link *n); // insert n before this object
Link *add(Link *n); // insert n after this object
Link *erase(); // remove this object from list
Link *find(const std::string &name); // find node matching passed in name in list
const Link *find(const std::string &name) const; // find node matching passed in name in const list
Link *find_if_myth(const std::string &myth); // find node matching passsed in myth in list
const Link *find_if_myth(const std::string &myth) const; // find node matching passsed in myth in const list
Link *advance(int n) const; // advance n positions in list
Link *add_ordered(Link *n); // insert n in its correct lexicographical position
God god() const { return m_god; }
Link *next() const { return m_succ; }
Link *previous() const { return m_prev; }
private:
God m_god;
Link *m_prev;
Link *m_succ;
};
void print_all(Link *p);
int main()
{
try
{
Link *gods = new Link{ { "Odin", "Norse",
"Eight-legged flying horse called Sleipnir", "Spear called Gungnir" } };
gods = gods->add_ordered(new Link{ { "Baldr", "Norse", "Ship called Hringorni", "None" } });
gods = gods->add_ordered(new Link{ { "Thor", "Norse",
"Chariot pulled by goats Tanngrisnir and Tanngnjostr", "Hammer called Mjolnir" } });
gods = gods->add_ordered(new Link{ { "Frejya", "Norse",
"Chariot pulled by two cats", "Magic called seidr" } });
gods = gods->add_ordered(new Link{ { "Ares", "Greek", "War chariot", "Sword and spear" } });
gods = gods->add_ordered(new Link{ { "Zeus", "Greek",
"A chariot pulled by the four major winds shaped as horses", "Thunderbolt" } });
gods = gods->add_ordered(new Link{ { "Apollo", "Greek",
"Chariot pulled by the four horses Aethon, Pyrois, Phlegon and Eous", "A bow" } });
gods = gods->add_ordered(new Link{ { "Hera", "Greek", "A chariot drawn by peacocks", "Her intelligence" } });
gods = gods->add_ordered(new Link{ { "Amaterasu", "Japanese", "", "Sword of Kusanagi, Jewel of Yasakani, Mirror of Yata" } });
gods = gods->add_ordered(new Link{ { "Susanoo", "Japanese", "", "Sword of Totsuka" } });
gods = gods->add_ordered(new Link{ { "Izanagi", "Japanese", "", "Sword of Totsuka (later given to Susanoo)" } });
gods = gods->add_ordered(new Link{ { "Bishamonten", "Japanese", "", "A spear" } });
print_all(gods);
Link *trav = gods;
while (trav->next() != nullptr)
{
trav = trav->next();
}
while (trav->previous() != nullptr)
{
trav = trav->erase();
trav = trav->previous();
}
trav = trav->erase();
delete trav;
}
catch (const std::runtime_error &rte)
{
std::cerr << "Runtime error: " << rte.what() << '\n';
keep_window_open();
return 1;
}
catch (const std::exception &e)
{
std::cerr << "Exception: " << e.what() << "\n";
keep_window_open();
return 2;
}
catch (...)
{
std::cerr << "An unknown exception occurred\n";
keep_window_open();
return 3;
}
keep_window_open();
}
Link::~Link()
{
Link *trav = this;
Link *head = nullptr;
if (trav && trav->m_succ && trav->m_prev)
{
while (trav->m_prev)
{
trav = trav->m_prev;
}
head = trav;
Link *current = trav;
while (trav->m_succ)
{
trav = trav->m_succ;
trav = trav->erase();
delete current;
current = trav = trav->m_succ;
}
}
delete trav;
trav = nullptr;
}
Link *Link::insert(Link *n)
{
if (n == nullptr)
{
error("Node to add cannot be null");
}
n->m_succ = this;
if (m_prev)
{
m_prev->m_succ = n;
}
n->m_prev = m_prev;
m_prev = n;
return n;
}
Link *Link::add(Link *n)
{
if (n == nullptr)
{
error("Node to add cannot be null");
}
n->m_prev = this;
if (m_succ)
{
m_succ->m_prev = n;
}
n->m_succ = m_succ;
m_succ = n;
return n;
}
Link *Link::erase()
{
Link *trav = this;
if (trav == nullptr)
{
return this;
}
if (trav->m_succ)
{
trav->m_succ->m_prev = trav->m_prev;
}
if (trav->m_prev)
{
trav->m_prev->m_succ = trav->m_succ;
}
return trav->m_succ;
}
Link *Link::find(const std::string &name)
{
Link *trav = this;
while (trav != nullptr)
{
if (trav->m_god.name() == name)
{
return trav;
}
trav = trav->m_succ;
}
return this;
}
const Link *Link::find(const std::string &name) const
{
const Link *c_trav = this; // const pointer
Link *nc_trav = const_cast<Link*>(c_trav); // non-const pointer
while (c_trav != nullptr && nc_trav != nullptr)
{
if (c_trav->m_god.name() == name)
{
return c_trav;
}
nc_trav = nc_trav->m_succ;
}
return this;
}
Link *Link::find_if_myth(const std::string &myth)
{
Link *trav = this;
while (trav != nullptr)
{
if (trav->m_god.myth() == myth)
{
return trav;
}
trav = trav->m_succ;
}
return this;
}
const Link *Link::find_if_myth(const std::string &myth) const
{
const Link *c_trav = this; // const pointer
Link *nc_trav = const_cast<Link*>(c_trav); // non-const pointer
while (c_trav != nullptr && nc_trav != nullptr)
{
if (c_trav->m_god.myth() == myth)
{
return c_trav;
}
nc_trav = nc_trav->m_succ;
}
return this;
}
Link *Link::advance(int n) const
{
Link *trav = const_cast<Link *>(this);
if (trav == nullptr)
{
return const_cast<Link*>(this);
}
if (n > 0)
{
while (n--)
{
if (trav->m_succ == nullptr)
{
return const_cast<Link*>(this);
}
trav = trav->m_succ;
}
}
else if (n < 0)
{
while (n++)
{
if (trav->m_prev == nullptr)
{
return const_cast<Link*>(this);
}
trav = trav->m_prev;
}
}
return trav;
}
Link *Link::add_ordered(Link *n)
{
if (!n)
{
error("Node to insert cannot be null");
}
Link *trav = this;
if (!trav)
{
return this;
}
// to make sure to start at head of the list
while (trav->m_prev != nullptr)
{
trav = trav->m_prev;
}
while (trav->m_god.name() < n->m_god.name() && trav->m_succ)
{
trav = trav->m_succ;
}
if (n->m_god.name() < trav->m_god.name())
{
trav = trav->insert(n);
}
else
{
trav = trav->add(n);
}
return trav;
}
void print_all(Link *p)
{
while (p->previous())
{
p = p->previous();
}
std::cout << "{\n";
while (p)
{
std::cout << "Name: " << p->god().name()
<< "; Myth: " << p->god().myth();
if (p->god().vehicle() != "")
{
std::cout << "; Vehicle: " << p->god().vehicle();
}
else
{
std::cout << "; Vehicle: N/A";
}
std::cout << "; Weapon: " << p->god().weapon();
if ((p = p->next()))
{
std::cout << "\n";
}
}
std::cout << "\n}\n";
}
|