C ++ Actor Framework允许演员进行强类型化。框架是否也支持对类型化actor的继承?
答案 0 :(得分:1)
是 - 只要新类型响应实例支持的消息子集,就可以将typed_actor实例视为不同的typed_actor类型。这是一个例子,其中c_type / C是a_type和b_type的超类型:
#include <iostream>
#include "caf/all.hpp"
using namespace caf;
using namespace std;
using a_type = typed_actor<replies_to<int>::with<void>>;
using b_type = typed_actor<replies_to<double>::with<void>>;
using c_type = a_type::extend<replies_to<double>::with<void>>;
class C : public c_type::base
{
protected:
behavior_type make_behavior() override
{
return
{
[this](int value)
{
aout(this) << "Received integer value: " << value << endl;
},
[this](double value)
{
aout(this) << "Received double value: " << value << endl;
},
after(chrono::seconds(5)) >> [this]
{
aout(this) << "Exiting after 5s" << endl;
this->quit();
}
};
}
};
void testerA(const a_type &spawnedActor)
{
scoped_actor self;
self->send(spawnedActor, 5);
}
void testerB(const b_type &spawnedActor)
{
scoped_actor self;
self->send(spawnedActor, -5.01);
}
int main()
{
auto spawnedActor = spawn<C>();
testerA(spawnedActor);
testerB(spawnedActor);
await_all_actors_done();
}
注意:CAF 0.14.0用户手册中有example显示其工作原理,但CAF 0.14.4已删除了spawn_typed方法,该方法可以使typed_actor的内联创建/生成成为可能。有关详细信息,请参阅相应的GitHub issue。