Repository navigation
Expand file tree
/
Copy pathBasicAlgorithms.cpp
More file actions
545 lines (413 loc) · 13.3 KB
/
Copy pathBasicAlgorithms.cpp
File metadata and controls
545 lines (413 loc) · 13.3 KB
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
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
// Copyright Sebastian Jeckel 2017.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include <iostream>
#include <string>
#include <utility>
#include <vector>
#include "react/state.h"
#include "react/event.h"
#include "react/observer.h"
#include "react/algorithm.h"
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Example 1 - Converting events to signals
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace example1
{
using namespace std;
using namespace react;
Group g;
struct Sensor
{
EventSource<int> samples = EventSource<int>::Create(g);
State<int> lastSample = Hold(0, samples);
auto GetReactiveMembers() const -> decltype(auto)
{ return std::tie(lastSample); }
};
void Run()
{
cout << "Example 1 - Converting events to signals" << endl;
Sensor sensor;
auto obs = Observer::Create(g, [] (int v)
{
cout << v << endl;
}, sensor.lastSample);
sensor.samples << 20 << 21 << 21 << 22; // output: 20, 21, 22
g.DoTransaction([&]
{
sensor.samples << 30 << 31 << 31 << 32;
}); // output: 32
cout << endl;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Example 2 - Converting signals to events
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace example2
{
using namespace std;
using namespace react;
Group g;
struct Employee
{
StateVar<string> name = StateVar<string>::Create(g, string( "Bob" ));
StateVar<int> salary = StateVar<int>::Create(g, 66666);
};
void Run()
{
cout << "Example 2 - Converting signals to events" << endl;
Employee bob;
auto obs = Observer::Create([] (const auto& events, const string& name)
{
for (int newSalary : events)
cout << name << " now earns " << newSalary << endl;
}, Monitor(bob.salary), bob.name);
bob.salary.Set(66667);
cout << endl;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Example 3 - Folding event streams into signals (1)
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace example3
{
using namespace std;
using namespace react;
Group g;
struct Counter
{
EventSource<> increment = EventSource<>::Create(g);
State<int> count = Iterate<int>(0, [] (const auto& events, int count)
{
for (auto e : events)
++count;
return count;
}, increment);
};
void Run()
{
cout << "Example 3 - Folding event streams into signals (1)" << endl;
Counter myCounter;
myCounter.increment.Emit();
myCounter.increment.Emit();
myCounter.increment.Emit();
auto obs = Observer::Create([] (int v)
{
cout << v << endl; // output: 3
}, myCounter.count);
cout << endl;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Example 4 - Folding event streams into signals (2)
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace example4
{
using namespace std;
using namespace react;
Group g;
struct Sensor
{
EventSource<float> input = EventSource<float>::Create(g);
State<int> count = Iterate<int>(0, [] (const auto& events, int count)
{
for (auto e : events)
++count;
return count;
}, input);
State<float> sum = Iterate<float>(0.0f, [] (const auto& events, float sum)
{
for (auto e : events)
sum += e;
return sum;
}, input);
State<float> average = State<float>::Create([] (int c, float s)
{
if (c != 0)
return s / c;
else
return 0.0f;
}, count, sum);
};
void Run()
{
cout << "Example 4 - Folding event streams into signals (2)" << endl;
Sensor mySensor;
mySensor.input << 10.0f << 5.0f << 10.0f << 8.0f;
auto obs = Observer::Create([] (float v)
{
cout << "Average: " << v << endl; // output: 8.25
}, mySensor.average);
cout << endl;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Example 5 - Folding event streams into signals (3)
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace example5
{
using namespace std;
using namespace react;
Group g;
enum ECmd { increment, decrement, reset };
class Counter
{
private:
static int DoCounterLoop(const EventValueList<int>& cmds, int count, int delta, int start)
{
for (int cmd : cmds)
{
if (cmd == increment)
count += delta;
else if (cmd == decrement)
count -= delta;
else
count = start;
}
return count;
}
public:
EventSource<int> update = EventSource<int>::Create(g);
StateVar<int> delta = StateVar<int>::Create(g, 1);
StateVar<int> start = StateVar<int>::Create(g, 0);
State<int> count = Iterate<int>(0, DoCounterLoop, update, delta, start);
};
void Run()
{
cout << "Example 5 - Folding event streams into signals (3)" << endl;
Counter myCounter;
{
auto obs = Observer::Create([] (int v)
{
cout << "Start: " << v << endl; // output: 0
}, myCounter.count);
}
myCounter.update.Emit(increment);
myCounter.update.Emit(increment);
myCounter.update.Emit(increment);
{
auto obs = Observer::Create([] (int v)
{
cout << "3x increment by 1: " << v << endl; // output: 3
}, myCounter.count);
}
myCounter.delta.Set(5);
myCounter.update.Emit(decrement);
{
auto obs = Observer::Create([] (int v)
{
cout << "1x decrement by 5: " << v << endl; // output: -2
}, myCounter.count);
}
myCounter.start.Set(100);
myCounter.update.Emit(reset);
{
auto obs = Observer::Create([] (int v)
{
cout << "reset to 100: " << v << endl; // output: 100
}, myCounter.count);
}
cout << endl;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Example 6 - Avoiding expensive copies
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace example6
{
using namespace std;
using namespace react;
Group g;
class Sensor
{
private:
static void DoIterateAllSamples(const EventValueList<int>& events, vector<int>& all)
{
for (int input : events)
all.push_back(input);
}
static void DoIterateCritSamples(const EventValueList<int> events, vector<int>& critical, int threshold)
{
for (int input : events)
if (input > threshold)
critical.push_back(input);
}
public:
EventSource<int> input = EventSource<int>::Create(g);
StateVar<int> threshold = StateVar<int>::Create(g, 42);
State<vector<int>> allSamples = IterateByRef<vector<int>>(vector<int>{ }, DoIterateAllSamples, input);
State<vector<int>> criticalSamples = IterateByRef<vector<int>>(vector<int>{ }, DoIterateCritSamples, input, threshold);
};
void Run()
{
cout << "Example 6 - Avoiding expensive copies" << endl;
Sensor mySensor;
mySensor.input << 40 << 29 << 43 << 50;
cout << "All samples: ";
{
auto obs = Observer::Create([] (const auto& allSamples)
{
for (auto const& v : allSamples)
cout << v << " ";
}, mySensor.allSamples);
}
cout << endl;
cout << "Critical samples: ";
{
auto obs = Observer::Create([] (const auto& criticalSamples)
{
for (auto const& v : criticalSamples)
cout << v << " ";
}, mySensor.criticalSamples);
}
cout << endl;
}
}
using namespace react;
Group g;
struct MyClass
{
StateVar<int> a = StateVar<int>::Create(g, 10);
StateVar<int> b = StateVar<int>::Create(g, 20);
bool operator==(const MyClass& other)
{ return a == other.a; }
struct Flat;
};
struct MyClass::Flat : public Flattened<MyClass>
{
using Flattened::Flattened;
Ref<int> a = this->Flatten(MyClass::a);
Ref<int> b = this->Flatten(MyClass::b);
};
using namespace react;
using namespace std;
void test1()
{
/*StateVar<int> x;
State<int> y;
State<int> z;
State<std::vector<State<int>>> list;
State<std::map<int, State<int>>> map;
State<std::vector<int>> flatlist = FlattenList(list);
State<std::map<int, int>> flatmap = FlattenMap(map);
MyClass cls1;
MyClass::Flat cls2(cls1);
StateVar<State<int>> sig;
Flatten(g, sig);*/
auto w1 = StateVar<string>::Create(g, "Widget1");
auto w2 = StateVar<string>::Create(g, "Widget2");
auto w3 = StateVar<string>::Create(g, "Widget3");
auto allWidgets = { w1, w2, w3 };
auto d1 = StateVar<string>::Create(g, "Data1");
auto d2 = StateVar<string>::Create(g, "Data2");
auto d3 = StateVar<string>::Create(g, "Data3");
auto allData = { d1, d2, d3 };
auto objects = StateVar<vector<StateVar<string>>>::Create(g);
auto obs = Observer::Create([] (const auto& flatList)
{
cout << "Objects: ";
for (const string& s : flatList)
cout << s << " ";
cout << endl;
}, FlattenList(objects));
// Objects:
objects.Modify([&] (auto& w)
{
w.push_back(w1);
});
// Objects: Widget1
w1.Set("Widget1 (x)");
// Objects: Widget1 (x)
objects.Set(allWidgets);
// Objects: Widget1 (x) Widget2 Widget3
objects.Set(allData);
// Objects: Data1 Data2 Data3
w2.Set("Widget2 (x)");
g.DoTransaction([&]
{
w3.Set("Widget3 (x)");
d1.Set("Data1 (x)");
d2.Set("Data2 (x)");
objects.Set(allWidgets);
});
// Objects: Widget1 (x) Widget2 (x) Widget3 (x)
objects.Modify([&] (auto& w)
{
w.clear();
w.insert(end(w), allWidgets);
w.insert(end(w), allData);
});
// Objects: Widget1 (x) Widget2 (x) Widget3 (x) Data1 (x) Data2 (x) Data3
}
class Office;
class Company;
class Employee;
//----
class Office
{
public:
StateVar<string> location;
StateVar<vector<State<Employee>>> employees;
State<int> employeeCount = State<int>::Create(CalcEmployeeCount, FlattenList(employees));
struct Flat;
private:
static int CalcEmployeeCount(const vector<Employee>& offices)
{ return offices.size(); }
};
struct Office::Flat : public Flattened<Office>
{
using Flattened::Flattened;
int employeeCount = this->Flatten(Office::employeeCount);
};
//----
class Employee
{
public:
StateVar<string> name;
StateRef<Office> office;
struct Flat;
private:
};
struct Employee::Flat : public Flattened<Employee>
{
using Flattened::Flattened;
Ref<string> name = this->Flatten(Employee::name);
Ref<Office> office = this->Flatten(Employee::office);
};
//----
class Company
{
public:
StateVar<vector<State<Office>>> offices;
State<int> employeeCount;
struct Flat;
private:
static int CalcEmployeeCount(const vector<Office::Flat>& offices)
{
int count = 0;
for (const auto& office : offices)
count += office.employeeCount;
return count;
}
};
struct Company::Flat : public Flattened<Company>
{
using Flattened::Flattened;
Ref<vector<State<Office>>> offices = this->Flatten(Company::offices);
int employeeCount = this->Flatten(Company::employeeCount);
};
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Run examples
///////////////////////////////////////////////////////////////////////////////////////////////////
int main()
{
/*example1::Run();
example2::Run();
example3::Run();
example4::Run();
example5::Run();
example6::Run();*/
test1();
return 0;
}