vector of function objects

This is a discussion on vector of function objects within the C++ Programming forums, part of the General Programming Boards category; Hi all, I want to be able to do this: Code: std::vector<???> vec; vec.push_back(boost::bind(&testClass::run,t)); vec.push_back(boost::bind(&testfunc)); for(int i = 0; i ...

  1. #1
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    vector of function objects

    Hi all, I want to be able to do this:
    Code:
    std::vector<???> vec; 
    vec.push_back(boost::bind(&testClass::run,t));
    vec.push_back(boost::bind(&testfunc));
    
    for(int i = 0; i <vec.size(); ++i) // invoke all function objects in vec...
    {
    	vec[i](); 
    }
    How do i accomplish this? All functions objects is invoked in the same way by the operator () but I have no idea how I make a vector of such objects, I tried first with a void (*)() but of course didn't it work, as I thought I have one ugly solution and it is to make a abstract class and then make a virtual method and use polymorphism.

    Thanks in advance.

  2. #2
    C++まいる!Cをこわせ!
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    Use an extra abstraction:
    Code:
    class CFunctorBase
    {
    public:
        virtual void operator () = 0;
    };
    
    template<typename T> class CFunctor: public CFunctorBase
    {
    public:
        FunctorBase(T Functor): m_Functor(Functor) { }
        virtual void operator () { m_Functor(); }
    private:
        T m_Functor;
    };
    
    template<typename T> T* CreateFunctor(T* Functor)
    {
        return Functor;
    }
    
    std::vector< boost::shared_ptr<FunctorBase> > v;
    v.push_back( CreateFunctor(new Functor(boost::bind(...)) );
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  3. #3
    Guest Sebastiani's Avatar
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    I've never used it myself, but I'm assuming like std::vector< boost::function< void ( * )( ) > > should work.

  4. #4
    C++まいる!Cをこわせ!
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    void (*) () doesn't work for member function pointers!
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  5. #5
    Registered User Codeplug's Avatar
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    boost::function<void ()> seems appropriate.
    Tutorial

    gg

  6. #6
    Guest Sebastiani's Avatar
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    void (*) () doesn't work for member function pointers!
    Well I know that. I just assumed boost::function would specialize it appropriately.

    I guess not.

    Doesn't seem very handy, though, IMO.

  7. #7
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    I fixed it, thanks for your answers

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