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248 lines (195 loc) · 6.27 KB
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// Copyright Sebastian Jeckel 2016.
// 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 "react/Event.h"
#include "react/Observer.h"
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Example 1 - Hello world
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace example1
{
using namespace std;
using namespace react;
// Defines a group.
// Each group represents a separate dependency graph.
// Reactives from different groups can not be mixed.
ReactiveGroup<> group;
// An event source that emits values of type string
namespace v1
{
EventSource<string> mySource( group );
void Run()
{
cout << "Example 1 - Hello world (string source)" << endl;
Observer<> obs(
[] (EventRange<string> in)
{
for (const auto& s : in)
cout << s << std::endl;
},
mySource);
mySource << string("Hello world #1");
// Or without the operator:
mySource.Emit(string("Hello world #2"));
cout << endl;
}
}
// An event source without an explicit value type
namespace v2
{
EventSource<> helloWorldTrigger( group );
void Run()
{
cout << "Example 1 - Hello world (token source)" << endl;
int count = 0;
Observer<> obs(
[&] (EventRange<> in)
{
for (auto t : in)
cout << "Hello world #" << ++count << endl;
},
helloWorldTrigger);
helloWorldTrigger.Emit();
// Or without the stream operator:
helloWorldTrigger << Token::value;
cout << endl;
}
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Example 2 - Merging event streams
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace example2
{
using namespace std;
using namespace react;
ReactiveGroup<> group;
// An event stream that merges both sources
EventSource<> leftClick( group );
EventSource<> rightClick( group );
Event<> anyClick = Merge(leftClick, rightClick);
void Run()
{
cout << "Example 2 - Merging event streams (Merge)" << endl;
int count = 0;
Observer<> obs(
[&] (EventRange<> in)
{
for (auto t : in)
cout << "clicked #" << ++count << endl;
},
anyClick);
leftClick.Emit(); // output: clicked #1
rightClick.Emit(); // output: clicked #2
cout << endl;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Example 3 - Filtering events
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace example3
{
using namespace std;
using namespace react;
ReactiveGroup<> group;
EventSource<int> numbers( group );
Event<int> greater10 = Filter([] (int n) { return n > 10; }, numbers);
void Run()
{
cout << "Example 3 - Filtering events" << endl;
Observer<> obs(
[&] (EventRange<int> in)
{
for (auto n : in)
cout << n << endl;
},
greater10);
numbers << 5 << 11 << 7 << 100; // output: 11, 100
cout << endl;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Example 4 - Filtering events
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace example4
{
using namespace std;
using namespace react;
ReactiveGroup<> group;
// Data types
enum class Tag { normal, critical };
using TaggedNum = pair<Tag, int>;
EventSource<int> numbers( group );
Event<TaggedNum> tagged = Transform<TaggedNum>(
[] (int n)
{
if (n > 10)
return TaggedNum( Tag::critical, n );
else
return TaggedNum( Tag::normal, n );
},
numbers);
void Run()
{
cout << "Example 4 - Transforming events" << endl;
Observer<> obs(
[] (EventRange<TaggedNum> in)
{
for (TaggedNum e : in)
{
if (e.first == Tag::critical)
cout << "(critical) " << e.second << endl;
else
cout << "(normal) " << e.second << endl;
}
},
tagged);
numbers << 5; // output: (normal) 5
numbers << 20; // output: (critical) 20
cout << endl;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Example 5 - Queuing multiple inputs
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace example5
{
using namespace std;
using namespace react;
ReactiveGroup<> group;
EventSource<int> src( group );
void Run()
{
cout << "Example 5 - Queuing multiple inputs" << endl;
Observer<> obs(
[] (EventRange<int> in)
{
for (int e : in)
cout << e << endl;
}, src);
// output: 1, 2, 3, 4
group.DoTransaction([]
{
src << 1 << 2 << 3;
src << 4;
});
cout << endl;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Run examples
///////////////////////////////////////////////////////////////////////////////////////////////////
int main()
{
example1::v1::Run();
example1::v2::Run();
example2::Run();
example3::Run();
example4::Run();
example5::Run();
return 0;
}