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417 lines (316 loc) · 11 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 <cmath>
#include <functional>
#include <iostream>
#include <string>
#include <utility>
#include <vector>
#include "react/Signal.h"
/*
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Example 1 - Hello world
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace example1
{
using namespace std;
using namespace react;
// Defines a domain.
// Each domain represents a separate dependency graph, managed by a dedicated propagation engine.
// Reactives of different domains can not be combined.
ReactiveGroup
// Define type aliases for the given domain in this namespace.
// Now we can use VarSignalT instead of D::VarSignalT.
USING_REACTIVE_DOMAIN(D)
// The concat function
string concatFunc(string first, string second) {
return first + string(" ") + second;
}
// A signal that concatenates both words
namespace v1
{
// The two words
VarSignalT<string> firstWord( string("Change") );
VarSignalT<string> secondWord( string("me!") );
SignalT<string> bothWords = MakeSignal(With(firstWord,secondWord), concatFunc);
void Run()
{
cout << "Example 1 - Hello world (MakeSignal)" << endl;
// Imperative imperative value access
cout << bothWords.Value() << endl;
// Imperative imperative change
firstWord <<= string("Hello");
cout << bothWords.Value() << endl;
secondWord <<= string("World");
cout << bothWords.Value() << endl;
cout << endl;
}
}
// Using overloaded operator + instead of explicit MakeSignal
namespace v2
{
// The two words
VarSignalT<string> firstWord = MakeVar<D>(string("Change"));
VarSignalT<string> secondWord = MakeVar<D>(string("me!"));
SignalT<string> bothWords = firstWord + string(" ") + secondWord;
void Run()
{
cout << "Example 1 - Hello world (operators)" << endl;
cout << bothWords.Value() << endl;
firstWord <<= string("Hello");
cout << bothWords.Value() << endl;
secondWord <<= string("World");
cout << bothWords.Value() << endl;
cout << endl;
}
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Example 2 - Reacting to value changes
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace example2
{
using namespace std;
using namespace react;
REACTIVE_DOMAIN(D, sequential)
USING_REACTIVE_DOMAIN(D)
VarSignalT<int> x = MakeVar<D>(1);
SignalT<int> xAbs = MakeSignal(x, [] (int x) { return abs(x); });
void Run()
{
cout << "Example 2 - Reacting to value changes" << endl;
Observe(xAbs, [] (int newValue) {
cout << "xAbs changed to " << newValue << endl;
});
// initially x is 1
x <<= 2; // output: xAbs changed to 2
x <<= -3; // output: xAbs changed to 3
x <<= 3; // no output, xAbs is still 3
cout << endl;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Example 3 - Changing multiple inputs
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace example3
{
using namespace std;
using namespace react;
REACTIVE_DOMAIN(D, sequential)
USING_REACTIVE_DOMAIN(D)
VarSignalT<int> a = MakeVar<D>(1);
VarSignalT<int> b = MakeVar<D>(1);
SignalT<int> x = a + b;
SignalT<int> y = a + b;
SignalT<int> z = x + y;
void Run()
{
cout << "Example 3 - Changing multiple inputs" << endl;
Observe(z, [] (int newValue) {
std::cout << "z changed to " << newValue << std::endl;
});
a <<= 2; // output: z changed to 6
b <<= 2; // output: z changed to 8
DoTransaction<D>([] {
a <<= 4;
b <<= 4;
}); // output: z changed to 16
cout << endl;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Example 4 - Modifying signal values in place
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace example4
{
using namespace std;
using namespace react;
REACTIVE_DOMAIN(D, sequential)
USING_REACTIVE_DOMAIN(D)
VarSignalT<vector<string>> data = MakeVar<D>(vector<string>{ });
void Run()
{
cout << "Example 4 - Modifying signal values in place" << endl;
data.Modify([] (vector<string>& data) {
data.push_back("Hello");
});
data.Modify([] (vector<string>& data) {
data.push_back("World");
});
for (const auto& s : data.Value())
cout << s << " ";
cout << endl;
// output: Hell World
cout << endl;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Example 5 - Complex signals
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace example5
{
using namespace std;
using namespace react;
REACTIVE_DOMAIN(D, sequential)
USING_REACTIVE_DOMAIN(D)
// Helpers
using ExprPairT = pair<string,int>;
using ExprVectT = vector<ExprPairT>;
string makeExprStr(int a, int b, const char* op)
{
return to_string(a) + string(op) + to_string(b);
}
ExprPairT makeExprPair(const string& s, int v)
{
return make_pair(s, v);
}
void printExpressions(const ExprVectT& expressions)
{
cout << "Expressions: " << endl;
for (const auto& p : expressions)
cout << "\t" << p.first << " is " << p.second << endl;
}
// Version 1 - Intermediate signals
namespace v1
{
// Input operands
VarSignalT<int> a = MakeVar<D>(1);
VarSignalT<int> b = MakeVar<D>(2);
// Calculations
SignalT<int> sum = a + b;
SignalT<int> diff = a - b;
SignalT<int> prod = a * b;
using std::placeholders::_1;
using std::placeholders::_2;
// Stringified expressions
SignalT<string> sumExpr =
MakeSignal(With(a,b), bind(makeExprStr, _1, _2, "+"));
SignalT<string> diffExpr =
MakeSignal(With(a,b), bind(makeExprStr, _1, _2, "-"));
SignalT<string> prodExpr =
MakeSignal(With(a,b), bind(makeExprStr, _1, _2, "*"));
// The expression vector
SignalT<ExprVectT> expressions = MakeSignal(
With(
MakeSignal(With(sumExpr, sum), &makeExprPair),
MakeSignal(With(diffExpr, diff), &makeExprPair),
MakeSignal(With(prodExpr, prod), &makeExprPair)
),
[] (const ExprPairT& sumP, const ExprPairT& diffP, const ExprPairT& prodP) {
return ExprVectT{ sumP, diffP, prodP};
});
void Run()
{
cout << "Example 5 - Complex signals (v1)" << endl;
Observe(expressions, printExpressions);
a <<= 10;
b <<= 20;
cout << endl;
}
}
// Version 2 - Intermediate signals in a function
namespace v2
{
SignalT<ExprVectT> createExpressionSignal(const SignalT<int>& a, const SignalT<int>& b)
{
using std::placeholders::_1;
using std::placeholders::_2;
// Inside a function, we can use auto
auto sumExpr =
MakeSignal(With(a,b), bind(makeExprStr, _1, _2, "+"));
auto diffExpr =
MakeSignal(With(a,b), bind(makeExprStr, _1, _2, "-"));
auto prodExpr =
MakeSignal(With(a,b), bind(makeExprStr, _1, _2, "*"));
return MakeSignal(
With(
MakeSignal(With(sumExpr, a + b), &makeExprPair),
MakeSignal(With(diffExpr, a - b), &makeExprPair),
MakeSignal(With(prodExpr, a * b), &makeExprPair)
),
[] (const ExprPairT& sumP, const ExprPairT& diffP, const ExprPairT& prodP) {
return ExprVectT{ sumP, diffP, prodP };
});
}
// Input operands
VarSignalT<int> a = MakeVar<D>(1);
VarSignalT<int> b = MakeVar<D>(2);
// The expression vector
SignalT<ExprVectT> expressions = createExpressionSignal(a, b);
void Run()
{
cout << "Example 5 - Complex signals (v2)" << endl;
Observe(expressions, printExpressions);
a <<= 30;
b <<= 40;
cout << endl;
}
}
// Version 3 - Imperative function
namespace v3
{
// Input operands
VarSignalT<int> a = MakeVar<D>(1);
VarSignalT<int> b = MakeVar<D>(2);
// The expression vector
SignalT<ExprVectT> expressions = MakeSignal(With(a,b), [] (int a, int b) {
ExprVectT result;
result.push_back(
make_pair(
makeExprStr(a, b, "+"),
a + b));
result.push_back(
make_pair(
makeExprStr(a, b, "-"),
a - b));
result.push_back(
make_pair(
makeExprStr(a, b, "*"),
a * b));
return result;
});
void Run()
{
cout << "Example 5 - Complex signals (v3)" << endl;
Observe(expressions, printExpressions);
a <<= 50;
b <<= 60;
cout << endl;
}
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Run examples
///////////////////////////////////////////////////////////////////////////////////////////////////
int main()
{
example1::v1::Run();
example1::v2::Run();
example2::Run();
example3::Run();
example4::Run();
example5::v1::Run();
example5::v2::Run();
example5::v3::Run();
return 0;
}
*/
using namespace react;
int main()
{
auto group = ReactiveGroup<shared>( );
auto sig1 = VarSignal<int, unique>( 1, group );
auto sig2 = VarSignal<int, shared>( 2, group );
sig1.Set(1);
sig1 <<= 1;
sig2.Modify([] (int& value) { value = 3; });
group.DoTransaction(
[&]
{
sig1 <<= 2;
});
auto sig3 = Signal<int, unique>( [] (auto a, auto b) { return a + b; }, sig1, sig2 );
return 0;
}