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Policy-based template design: How to access certain policies of the class?


By : Siddharth Manu
Date : October 15 2020, 01:18 AM
wish of those help What you have is not exactly policy-based design IMO... if it were, your class should've actually implemented (i.e. extended) the policies.
Now, back to your question/example. In your container, you store a "DishBase*". Right? From that point on, you loose any compile-time information wrt the actual type of the objects in the collection. So, I'm afraid what you try to do is provably impossible.
code :


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What is a good tutorial for C++ policy-based class design?


By : Mohsen Movahed
Date : March 29 2020, 07:55 AM
this one helps. In my experience its pretty much a self contained book, as long as you know your way around C++.
This is kind of a silly question. Just dive in the book, if something's not clear, look it up. Why ask questions about chaper 1 when you can just read it and find out?

Getting a template class specialization based on a Base policy work for all derived policies


By : Sammy Chowdhury
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I have policies that derive from a base policy. Some classes specialize for the derived policies while others specialize only for the base policy and can work with all derived policies. , This is a case for SFINAE.
code :
template< typename Policy, ...some_condition... >
struct Foo<Policy>
{
 ...
};
template< typename Policy, enable_if< is_base<BasePolicy, Policy> > >
template< typename Policy,
           enable_if_c <is_same<Policy, BasePolicy>::value || 
                         is_same<Policy, DerivedPolicy1>::value> || 
                         ...whatever...
                        >
         >

C++ policy based design.... base class as either sigleton or not based on template parametere.


By : Gamo Santana Chávez
Date : March 29 2020, 07:55 AM
this will help To keep things simple - OutputPolicy at your algo classes level should be a simple class with simple method. Of course you can implement it with singleton or static methods from the real implementation class:
code :
template < class T>
class OutMessageQueueTcp
{
public:
    void NewMsg(string in)
    {
       impl.NewMsg(in);
    }
private:
   static OutMessageQueueTcpImpl<T> impl;
};
template < class T>
class OutMessageQueueTcp
{
public:
    void NewMsg(string in)
    {
       OutMessageQueueTcpImpl<T>::NewMsg(in);
    }
};
template <template <typename> class OutputPolicy>
class AlgoImp
{
public:
    AlgoImp(string topic) {} 
    void OnData(
    {
        cout << " AlgoImp::OnData";
        if ( .... ) 
            outputPolicy.NewMsg(msg);
    }
private:
   OutputPolicy<AlgoImp> outputPolicy;
};

multiple use of policies in policy-based design


By : Sergio Franco
Date : March 29 2020, 07:55 AM
should help you out Instead of inheriting, you could add data members to roundtrip, but the functions in walk and car are currently protected. If you cannot make the functions in walk and car public, you could:
code :
class walk {
protected:
    void move() {
        std::cout<<"i'm walking."<<std::endl;
    }
    template<class T, class S>
    friend class roundtrip;
};
template<typename S, typename T>
class roundtrip {
private:
    struct helperT : private T
    {
    public: // or private + friend roundtrip
        using T::move;
        using T::T;
    } mT;

    struct helperS : private S
    {
    public:
        using S::move;
        using S::S;
    } mS;

public:
    void printSchedule(void) {
        std::cout<<"away: ";
        mT.move();

        std::cout<<"return: ";
        mS.move();
    }
};
template<typename S, typename T>
class roundtrip {
private:
    template<class U>
    struct helper : private U
    {
    public: // or private + friend roundtrip
        using U::move;
        using U::U;
    };

    helper<S> mS;
    helper<T> mT;

public:
    void printSchedule(void) {
        std::cout<<"away: ";
        mT.move();

        std::cout<<"return: ";
        mS.move();
    }
};

How to realize the policy based design with class mixins?


By : ssekav
Date : March 29 2020, 07:55 AM
it fixes the issue I wrote a blog post which might be relevant: Low-overhead components. It discusses using mixins as building blocks for creating flexible, configurable and high-performance components, and the associated caveats.
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