I'm reasing about the best way to implement the strategy pattern in C++. Up to now, I've always used the standard way, where the context has a pointer to the base strategy class as follows:
class AbstractStrategy{
public:
virtual void exec() = 0;
}
class ConcreteStrategyA{
public:
void exec();
}
class ConcreteStrategyB{
public:
void exec();
}
class Context{
public:
Context(AbstractStrategy* strategy):strategy_(strategy){}
~Context(){
delete strategy;
}
void run(){
strategy->exec();
}
private:
AbstractStrategy* strategy_;
Since having pointers to objects can result in bad behavior, I was looking for a safer way to implement this pattern and I found this question where std::function
are proposed as a better way to handle this pattern.
Could someone please explain better how std::function
works, maybe with an example with the strategy pattern?
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