Template meta-programming with member function pointers?

Question

Is it possible to use member function pointers with template meta-programming? Such as:

class Connection{
public:
    string getName() const;
    string getAlias() const;
//more stuff
};

typedef string (Connection::*Con_Func)() const;

template<Con_Func _Name>
class Foo{
    Connection m_Connect;
public:
    Foo(){
        cout << (m_Connect.*_Name)();
    }
};

typedef Foo<&Connection::getName> NamedFoo;
typedef Foo<&Connection::getAlias> AliasFoo;

Granted, this is rather contrived but is it possible? (yes, there are probably much better ways but humor me.)

luke · Accepted Answer · 2010-05-17 18:31:15Z

2

Check out this discussion on the subject of pointers-to-nonstatic-members as template parameters. It looks like there are issues with the VC++ implementation.

answered May 17, 2010 at 18:31

luke

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1 Comment

wheaties Over a year ago

Ah ha! Problems with VC++ implementation! Go figure.

BenMorel · Accepted Answer · 2014-01-30 13:59:18Z

2

If you are asking, can pointers to members be used as template parameters, then yes they can. There are a number of errors in your code though. This is, I think, what you might mean:

// Necessary includes
#include <string>
#include <iostream>
#include <ostream>

class Connection{
public:
        // Use std:: for standard string class
        std::string getName() const;
        std::string getAlias() const;
//more stuff
};

typedef std::string (Connection::*Con_Func)() const;

template<Con_Func _Name>
class Foo{
    Connection m_Connect;
public:
    // Constructors don't have return values
    Foo(){
         // Correct syntax for function call through pointer to member
         std::cout << (m_Connect.*_Name)();
    }
};

typedef Foo<&Connection::getName> NamedFoo;
typedef Foo<&Connection::getAlias> AliasFoo;

edited Jan 30, 2014 at 13:59

BenMorel

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answered May 17, 2010 at 18:26

Lara Bailey

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1 Comment

wheaties Over a year ago

You're right. Hold on, what you have is what I have in my code. I had originally writte void Bar() but backtracked to a constructor.

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