Observer(Event) system (Signals and Slots), type and template based
0
Signals are represented as types. You can connect a member function of some instance to the Observer system. This connected function will be called whenever a signal of a type that is the same type as the function parameter is emitted.
ObserverSystem.hpp:
#include <vector>
class ObserverSystem
{
public:
template<typename SignalType>
inline static void emitSignal(const SignalType& signal)
{
for(auto f : callEverything<SignalType>)
{
f(signal);
}
}
template<typename SignalType, typename ObjectType>
inline static void connect(ObjectType& object, void (ObjectType::*function)(const SignalType& signal))
{
bool add = true;
for(auto& entry : functions<SignalType, ObjectType>)
{
if(entry.function == function && entry.object == &object)
{
add = false;
break;
}
}
if(add)
{
functions<SignalType, ObjectType>.emplace_back(ObjectFunction<SignalType, ObjectType>{&object, function});
}
add = true;
for(auto& entry : callEverything<SignalType>)
{
if(entry == callAll<SignalType, ObjectType>)
{
add = false;
break;
}
}
if(add)
{
callEverything<SignalType>.emplace_back(callAll<SignalType, ObjectType>);
}
}
template<typename SignalType, typename ObjectType>
inline static void disconnect(ObjectType& object, void (ObjectType::*function)(const SignalType& signal))
{
for(size_t i = 0; i < functions<SignalType, ObjectType>.size();)
{
if(functions<SignalType, ObjectType>[i].function == function && functions<SignalType, ObjectType>[i].object == &object)
{
functions<SignalType, ObjectType>.erase(functions<SignalType, ObjectType>.begin() + i);
}
else
{
i++;
}
}
}
private:
template<typename SignalType, typename ObjectType>
struct ObjectFunction
{
ObjectType* object;
void (ObjectType::*function)(const SignalType& signal);
void call(const SignalType& signal)
{
(object->*function)(signal);
}
};
template<typename SignalType, typename ObjectType>
inline static std::vector<ObjectFunction<SignalType, ObjectType>> functions;
template<typename SignalType, typename ObjectType>
inline static void callAll(const SignalType& signal)
{
for(auto function : functions<SignalType, ObjectType>)
{
function.call(signal);
}
}
template<typename SignalType>
inline static std::vector<void (*)(const SignalType& signal)> callEverything;
};
main.cpp
#include <iostream>
#include "ObserverSystem.hpp"
struct SignalTypeOne
{
int b;
};
struct SignalTypeTwo
{
int x;
int y;
};
struct Hello
{
int a = 123;
void f(const SignalTypeOne& signal)
{
std::cout << (int*)this << " : a: " << a << std::endl;
std::cout << "b: " << signal.b << std::endl;
}
};
struct Some
{
int vx = 0;
int vy = 0;
void f1(const SignalTypeTwo& signal)
{
vx += signal.x;
vy += signal.y;
}
void f2(const SignalTypeOne& signal)
{
std::cout << (int*)this << ": " << "vx = " << vx <<", vy = " << vy << std::endl;
}
};
int main()
{
Hello h;
Hello g = Hello{321};
Some v1;
Some v2;
ObserverSystem::connect(h, &Hello::f);
ObserverSystem::connect(g, &Hello::f);
ObserverSystem::connect(v1, &Some::f1);
ObserverSystem::connect(v2, &Some::f1);
ObserverSystem::connect(v1, &Some::f2);
ObserverSystem::connect(v2, &Some::f2);
ObserverSystem::emitSignal(SignalTypeTwo{1,1});
ObserverSystem::emitSignal(SignalTypeOne{444});
ObserverSystem::disconnect(h, &Hello::f);
ObserverSystem::disconnect(v1, &Some::f1);
ObserverSystem::emitSignal(SignalTypeTwo{1,2});
ObserverSystem::emitSignal(SignalTypeOne{555});
ObserverSystem::connect(h, &Hello::f);
ObserverSystem::emitSignal(SignalTypeTwo{2,1});
ObserverSystem::emitSignal(SignalTypeOne{666});
ObserverSystem::disconnect(h, &Hello::f);
ObserverSystem::disconnect(g, &Hello::f);
ObserverSystem::disconnect(v2, &Some::f1);
ObserverSystem::disconnect(v1, &Some::f2);
ObserverSystem::disconnect(v2, &Some::f2);
ObserverSystem::emitSignal(SignalTypeTwo{100,100});
ObserverSystem::emitSignal(SignalTypeOne{777});
return 0;
}
Exemplary output:
0x7ffe51692a18 : a: 123
b: 444
0x7ffe51692a10 : a: 321
b: 444
0x7ffe51692a08: vx = 1, vy = 1
0x7ffe51692a00: vx = 1, vy = 1
0x7ffe51692a10 : a: 321
b: 555
0x7ffe51692a08: vx = 1, vy = 1
0x7ffe51692a00: vx = 2, vy = 3
0x7ffe51692a10 : a: 321
b: 666
0x7ffe51692a18 : a: 123
b: 666
0x7ffe51692a08: vx = 1, vy = 1
0x7ffe51692a00: vx = 4, vy = 4
A function should always get disconnected when it gets destroyed.
c++ template event-handling observer-pattern
asked 44 mins ago
Darius Duesentrieb
1937
add a comment |
0
Signals are represented as types. You can connect a member function of some instance to the Observer system. This connected function will be called whenever a signal of a type that is the same type as the function parameter is emitted.
ObserverSystem.hpp:
#include <vector>
class ObserverSystem
{
public:
template<typename SignalType>
inline static void emitSignal(const SignalType& signal)
{
for(auto f : callEverything<SignalType>)
{
f(signal);
}
}
template<typename SignalType, typename ObjectType>
inline static void connect(ObjectType& object, void (ObjectType::*function)(const SignalType& signal))
{
bool add = true;
for(auto& entry : functions<SignalType, ObjectType>)
{
if(entry.function == function && entry.object == &object)
{
add = false;
break;
}
}
if(add)
{
functions<SignalType, ObjectType>.emplace_back(ObjectFunction<SignalType, ObjectType>{&object, function});
}
add = true;
for(auto& entry : callEverything<SignalType>)
{
if(entry == callAll<SignalType, ObjectType>)
{
add = false;
break;
}
}
if(add)
{
callEverything<SignalType>.emplace_back(callAll<SignalType, ObjectType>);
}
}
template<typename SignalType, typename ObjectType>
inline static void disconnect(ObjectType& object, void (ObjectType::*function)(const SignalType& signal))
{
for(size_t i = 0; i < functions<SignalType, ObjectType>.size();)
{
if(functions<SignalType, ObjectType>[i].function == function && functions<SignalType, ObjectType>[i].object == &object)
{
functions<SignalType, ObjectType>.erase(functions<SignalType, ObjectType>.begin() + i);
}
else
{
i++;
}
}
}
private:
template<typename SignalType, typename ObjectType>
struct ObjectFunction
{
ObjectType* object;
void (ObjectType::*function)(const SignalType& signal);
void call(const SignalType& signal)
{
(object->*function)(signal);
}
};
template<typename SignalType, typename ObjectType>
inline static std::vector<ObjectFunction<SignalType, ObjectType>> functions;
template<typename SignalType, typename ObjectType>
inline static void callAll(const SignalType& signal)
{
for(auto function : functions<SignalType, ObjectType>)
{
function.call(signal);
}
}
template<typename SignalType>
inline static std::vector<void (*)(const SignalType& signal)> callEverything;
};
main.cpp
#include <iostream>
#include "ObserverSystem.hpp"
struct SignalTypeOne
{
int b;
};
struct SignalTypeTwo
{
int x;
int y;
};
struct Hello
{
int a = 123;
void f(const SignalTypeOne& signal)
{
std::cout << (int*)this << " : a: " << a << std::endl;
std::cout << "b: " << signal.b << std::endl;
}
};
struct Some
{
int vx = 0;
int vy = 0;
void f1(const SignalTypeTwo& signal)
{
vx += signal.x;
vy += signal.y;
}
void f2(const SignalTypeOne& signal)
{
std::cout << (int*)this << ": " << "vx = " << vx <<", vy = " << vy << std::endl;
}
};
int main()
{
Hello h;
Hello g = Hello{321};
Some v1;
Some v2;
ObserverSystem::connect(h, &Hello::f);
ObserverSystem::connect(g, &Hello::f);
ObserverSystem::connect(v1, &Some::f1);
ObserverSystem::connect(v2, &Some::f1);
ObserverSystem::connect(v1, &Some::f2);
ObserverSystem::connect(v2, &Some::f2);
ObserverSystem::emitSignal(SignalTypeTwo{1,1});
ObserverSystem::emitSignal(SignalTypeOne{444});
ObserverSystem::disconnect(h, &Hello::f);
ObserverSystem::disconnect(v1, &Some::f1);
ObserverSystem::emitSignal(SignalTypeTwo{1,2});
ObserverSystem::emitSignal(SignalTypeOne{555});
ObserverSystem::connect(h, &Hello::f);
ObserverSystem::emitSignal(SignalTypeTwo{2,1});
ObserverSystem::emitSignal(SignalTypeOne{666});
ObserverSystem::disconnect(h, &Hello::f);
ObserverSystem::disconnect(g, &Hello::f);
ObserverSystem::disconnect(v2, &Some::f1);
ObserverSystem::disconnect(v1, &Some::f2);
ObserverSystem::disconnect(v2, &Some::f2);
ObserverSystem::emitSignal(SignalTypeTwo{100,100});
ObserverSystem::emitSignal(SignalTypeOne{777});
return 0;
}
Exemplary output:
0x7ffe51692a18 : a: 123
b: 444
0x7ffe51692a10 : a: 321
b: 444
0x7ffe51692a08: vx = 1, vy = 1
0x7ffe51692a00: vx = 1, vy = 1
0x7ffe51692a10 : a: 321
b: 555
0x7ffe51692a08: vx = 1, vy = 1
0x7ffe51692a00: vx = 2, vy = 3
0x7ffe51692a10 : a: 321
b: 666
0x7ffe51692a18 : a: 123
b: 666
0x7ffe51692a08: vx = 1, vy = 1
0x7ffe51692a00: vx = 4, vy = 4
A function should always get disconnected when it gets destroyed.
c++ template event-handling observer-pattern
asked 44 mins ago
Darius Duesentrieb
1937
add a comment |
0
0
0
Signals are represented as types. You can connect a member function of some instance to the Observer system. This connected function will be called whenever a signal of a type that is the same type as the function parameter is emitted.
ObserverSystem.hpp:
#include <vector>
class ObserverSystem
{
public:
template<typename SignalType>
inline static void emitSignal(const SignalType& signal)
{
for(auto f : callEverything<SignalType>)
{
f(signal);
}
}
template<typename SignalType, typename ObjectType>
inline static void connect(ObjectType& object, void (ObjectType::*function)(const SignalType& signal))
{
bool add = true;
for(auto& entry : functions<SignalType, ObjectType>)
{
if(entry.function == function && entry.object == &object)
{
add = false;
break;
}
}
if(add)
{
functions<SignalType, ObjectType>.emplace_back(ObjectFunction<SignalType, ObjectType>{&object, function});
}
add = true;
for(auto& entry : callEverything<SignalType>)
{
if(entry == callAll<SignalType, ObjectType>)
{
add = false;
break;
}
}
if(add)
{
callEverything<SignalType>.emplace_back(callAll<SignalType, ObjectType>);
}
}
template<typename SignalType, typename ObjectType>
inline static void disconnect(ObjectType& object, void (ObjectType::*function)(const SignalType& signal))
{
for(size_t i = 0; i < functions<SignalType, ObjectType>.size();)
{
if(functions<SignalType, ObjectType>[i].function == function && functions<SignalType, ObjectType>[i].object == &object)
{
functions<SignalType, ObjectType>.erase(functions<SignalType, ObjectType>.begin() + i);
}
else
{
i++;
}
}
}
private:
template<typename SignalType, typename ObjectType>
struct ObjectFunction
{
ObjectType* object;
void (ObjectType::*function)(const SignalType& signal);
void call(const SignalType& signal)
{
(object->*function)(signal);
}
};
template<typename SignalType, typename ObjectType>
inline static std::vector<ObjectFunction<SignalType, ObjectType>> functions;
template<typename SignalType, typename ObjectType>
inline static void callAll(const SignalType& signal)
{
for(auto function : functions<SignalType, ObjectType>)
{
function.call(signal);
}
}
template<typename SignalType>
inline static std::vector<void (*)(const SignalType& signal)> callEverything;
};
main.cpp
#include <iostream>
#include "ObserverSystem.hpp"
struct SignalTypeOne
{
int b;
};
struct SignalTypeTwo
{
int x;
int y;
};
struct Hello
{
int a = 123;
void f(const SignalTypeOne& signal)
{
std::cout << (int*)this << " : a: " << a << std::endl;
std::cout << "b: " << signal.b << std::endl;
}
};
struct Some
{
int vx = 0;
int vy = 0;
void f1(const SignalTypeTwo& signal)
{
vx += signal.x;
vy += signal.y;
}
void f2(const SignalTypeOne& signal)
{
std::cout << (int*)this << ": " << "vx = " << vx <<", vy = " << vy << std::endl;
}
};
int main()
{
Hello h;
Hello g = Hello{321};
Some v1;
Some v2;
ObserverSystem::connect(h, &Hello::f);
ObserverSystem::connect(g, &Hello::f);
ObserverSystem::connect(v1, &Some::f1);
ObserverSystem::connect(v2, &Some::f1);
ObserverSystem::connect(v1, &Some::f2);
ObserverSystem::connect(v2, &Some::f2);
ObserverSystem::emitSignal(SignalTypeTwo{1,1});
ObserverSystem::emitSignal(SignalTypeOne{444});
ObserverSystem::disconnect(h, &Hello::f);
ObserverSystem::disconnect(v1, &Some::f1);
ObserverSystem::emitSignal(SignalTypeTwo{1,2});
ObserverSystem::emitSignal(SignalTypeOne{555});
ObserverSystem::connect(h, &Hello::f);
ObserverSystem::emitSignal(SignalTypeTwo{2,1});
ObserverSystem::emitSignal(SignalTypeOne{666});
ObserverSystem::disconnect(h, &Hello::f);
ObserverSystem::disconnect(g, &Hello::f);
ObserverSystem::disconnect(v2, &Some::f1);
ObserverSystem::disconnect(v1, &Some::f2);
ObserverSystem::disconnect(v2, &Some::f2);
ObserverSystem::emitSignal(SignalTypeTwo{100,100});
ObserverSystem::emitSignal(SignalTypeOne{777});
return 0;
}
Exemplary output:
0x7ffe51692a18 : a: 123
b: 444
0x7ffe51692a10 : a: 321
b: 444
0x7ffe51692a08: vx = 1, vy = 1
0x7ffe51692a00: vx = 1, vy = 1
0x7ffe51692a10 : a: 321
b: 555
0x7ffe51692a08: vx = 1, vy = 1
0x7ffe51692a00: vx = 2, vy = 3
0x7ffe51692a10 : a: 321
b: 666
0x7ffe51692a18 : a: 123
b: 666
0x7ffe51692a08: vx = 1, vy = 1
0x7ffe51692a00: vx = 4, vy = 4
A function should always get disconnected when it gets destroyed.
c++ template event-handling observer-pattern
asked 44 mins ago
Darius Duesentrieb
1937
Signals are represented as types. You can connect a member function of some instance to the Observer system. This connected function will be called whenever a signal of a type that is the same type as the function parameter is emitted.
ObserverSystem.hpp:
#include <vector>
class ObserverSystem
{
public:
template<typename SignalType>
inline static void emitSignal(const SignalType& signal)
{
for(auto f : callEverything<SignalType>)
{
f(signal);
}
}
template<typename SignalType, typename ObjectType>
inline static void connect(ObjectType& object, void (ObjectType::*function)(const SignalType& signal))
{
bool add = true;
for(auto& entry : functions<SignalType, ObjectType>)
{
if(entry.function == function && entry.object == &object)
{
add = false;
break;
}
}
if(add)
{
functions<SignalType, ObjectType>.emplace_back(ObjectFunction<SignalType, ObjectType>{&object, function});
}
add = true;
for(auto& entry : callEverything<SignalType>)
{
if(entry == callAll<SignalType, ObjectType>)
{
add = false;
break;
}
}
if(add)
{
callEverything<SignalType>.emplace_back(callAll<SignalType, ObjectType>);
}
}
template<typename SignalType, typename ObjectType>
inline static void disconnect(ObjectType& object, void (ObjectType::*function)(const SignalType& signal))
{
for(size_t i = 0; i < functions<SignalType, ObjectType>.size();)
{
if(functions<SignalType, ObjectType>[i].function == function && functions<SignalType, ObjectType>[i].object == &object)
{
functions<SignalType, ObjectType>.erase(functions<SignalType, ObjectType>.begin() + i);
}
else
{
i++;
}
}
}
private:
template<typename SignalType, typename ObjectType>
struct ObjectFunction
{
ObjectType* object;
void (ObjectType::*function)(const SignalType& signal);
void call(const SignalType& signal)
{
(object->*function)(signal);
}
};
template<typename SignalType, typename ObjectType>
inline static std::vector<ObjectFunction<SignalType, ObjectType>> functions;
template<typename SignalType, typename ObjectType>
inline static void callAll(const SignalType& signal)
{
for(auto function : functions<SignalType, ObjectType>)
{
function.call(signal);
}
}
template<typename SignalType>
inline static std::vector<void (*)(const SignalType& signal)> callEverything;
};
main.cpp
#include <iostream>
#include "ObserverSystem.hpp"
struct SignalTypeOne
{
int b;
};
struct SignalTypeTwo
{
int x;
int y;
};
struct Hello
{
int a = 123;
void f(const SignalTypeOne& signal)
{
std::cout << (int*)this << " : a: " << a << std::endl;
std::cout << "b: " << signal.b << std::endl;
}
};
struct Some
{
int vx = 0;
int vy = 0;
void f1(const SignalTypeTwo& signal)
{
vx += signal.x;
vy += signal.y;
}
void f2(const SignalTypeOne& signal)
{
std::cout << (int*)this << ": " << "vx = " << vx <<", vy = " << vy << std::endl;
}
};
int main()
{
Hello h;
Hello g = Hello{321};
Some v1;
Some v2;
ObserverSystem::connect(h, &Hello::f);
ObserverSystem::connect(g, &Hello::f);
ObserverSystem::connect(v1, &Some::f1);
ObserverSystem::connect(v2, &Some::f1);
ObserverSystem::connect(v1, &Some::f2);
ObserverSystem::connect(v2, &Some::f2);
ObserverSystem::emitSignal(SignalTypeTwo{1,1});
ObserverSystem::emitSignal(SignalTypeOne{444});
ObserverSystem::disconnect(h, &Hello::f);
ObserverSystem::disconnect(v1, &Some::f1);
ObserverSystem::emitSignal(SignalTypeTwo{1,2});
ObserverSystem::emitSignal(SignalTypeOne{555});
ObserverSystem::connect(h, &Hello::f);
ObserverSystem::emitSignal(SignalTypeTwo{2,1});
ObserverSystem::emitSignal(SignalTypeOne{666});
ObserverSystem::disconnect(h, &Hello::f);
ObserverSystem::disconnect(g, &Hello::f);
ObserverSystem::disconnect(v2, &Some::f1);
ObserverSystem::disconnect(v1, &Some::f2);
ObserverSystem::disconnect(v2, &Some::f2);
ObserverSystem::emitSignal(SignalTypeTwo{100,100});
ObserverSystem::emitSignal(SignalTypeOne{777});
return 0;
}
Exemplary output:
0x7ffe51692a18 : a: 123
b: 444
0x7ffe51692a10 : a: 321
b: 444
0x7ffe51692a08: vx = 1, vy = 1
0x7ffe51692a00: vx = 1, vy = 1
0x7ffe51692a10 : a: 321
b: 555
0x7ffe51692a08: vx = 1, vy = 1
0x7ffe51692a00: vx = 2, vy = 3
0x7ffe51692a10 : a: 321
b: 666
0x7ffe51692a18 : a: 123
b: 666
0x7ffe51692a08: vx = 1, vy = 1
0x7ffe51692a00: vx = 4, vy = 4
A function should always get disconnected when it gets destroyed.
c++ template event-handling observer-pattern
c++ template event-handling observer-pattern
asked 44 mins ago
Darius Duesentrieb
1937
asked 44 mins ago
Darius Duesentrieb
1937
edited 19 mins ago
asked 44 mins ago
Darius Duesentrieb
1937
asked 44 mins ago
Darius Duesentrieb
1937
asked 44 mins ago
Darius Duesentrieb
1937
1937
add a comment |
add a comment |
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