Trouble with member function accepting template function pointer









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I'm trying to create a member method on my array class for sorting. I typedef'd two function pointers in my class one for a generic sorting method, and the other for the comparator. I'm having trouble navigating through the errors to determine exactly what is wrong with the way I'm calling it. I hope I've provided enough information, but here's what I got.



The error I'm getting:



main.cpp: In function ‘int main(int, char**)’:
main.cpp:222:67: error: no matching function for call to ‘array<int>::sort(<unresolved overloaded function type>, <unresolved overloaded function type>)’
sort(wrap_insertion_sort_recursive<int>, custom_comparator<int>);
^
main.cpp:55:6: note: candidate: void array<T>::sort(array<T>::p_sort_func, array<T>::p_comparator_func) [with T = int; array<T>::p_sort_func = void (*)(array<int>&, bool (*)(int, int)); array<T>::p_comparator_func = bool (*)(int, int)]
void array<T>::sort(array<T>::p_sort_func sort_func,
^~~~~~~~
main.cpp:55:6: note: no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘array<int>::p_sort_func aka void (*)(array<int>&, bool (*)(int, int))’


I'm defining my typedefs here:



template <typename T>
class array
public:
typedef bool (*p_comparator_func)(T a, T b);
typedef void (*p_sort_func)(class array<T> &array, p_comparator_func);
...
void sort(array::p_sort_func sort_func,
array::p_comparator_func comparator_func);

...



My implementation of sort:



template <typename T>
void array<T>::sort(array<T>::p_sort_func sort_func,
array<T>::p_comparator_func comparator_func)

if(comparator_func == nullptr)
comparator_func = this->default_comparator;


if(sort_func == nullptr)
sort_func = this->default_sort;


sort_func(*this, comparator_func);



The sort function I am passing:



template <typename T>
void wrap_insertion_sort_recursive(class array<T> &array,
class array<T>::p_comparator_func comparator)

insertion_sort_recursive(array, array.get_capacity(), comparator);



My custom comparator:



template <typename T>
bool custom_comparator(T a, T b)

return a < b;



And where I'm calling it in main:



class array<int> a(5);
a[0] = 8;
a[1] = 6;
a[2] = 7;
a[3] = 1;
a[4] = 3;

std::cout << "attempting sort" << std::endl;
a.sort(wrap_insertion_sort_recursive<int>, custom_comparator<int>);









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    I'm trying to create a member method on my array class for sorting. I typedef'd two function pointers in my class one for a generic sorting method, and the other for the comparator. I'm having trouble navigating through the errors to determine exactly what is wrong with the way I'm calling it. I hope I've provided enough information, but here's what I got.



    The error I'm getting:



    main.cpp: In function ‘int main(int, char**)’:
    main.cpp:222:67: error: no matching function for call to ‘array<int>::sort(<unresolved overloaded function type>, <unresolved overloaded function type>)’
    sort(wrap_insertion_sort_recursive<int>, custom_comparator<int>);
    ^
    main.cpp:55:6: note: candidate: void array<T>::sort(array<T>::p_sort_func, array<T>::p_comparator_func) [with T = int; array<T>::p_sort_func = void (*)(array<int>&, bool (*)(int, int)); array<T>::p_comparator_func = bool (*)(int, int)]
    void array<T>::sort(array<T>::p_sort_func sort_func,
    ^~~~~~~~
    main.cpp:55:6: note: no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘array<int>::p_sort_func aka void (*)(array<int>&, bool (*)(int, int))’


    I'm defining my typedefs here:



    template <typename T>
    class array
    public:
    typedef bool (*p_comparator_func)(T a, T b);
    typedef void (*p_sort_func)(class array<T> &array, p_comparator_func);
    ...
    void sort(array::p_sort_func sort_func,
    array::p_comparator_func comparator_func);

    ...



    My implementation of sort:



    template <typename T>
    void array<T>::sort(array<T>::p_sort_func sort_func,
    array<T>::p_comparator_func comparator_func)

    if(comparator_func == nullptr)
    comparator_func = this->default_comparator;


    if(sort_func == nullptr)
    sort_func = this->default_sort;


    sort_func(*this, comparator_func);



    The sort function I am passing:



    template <typename T>
    void wrap_insertion_sort_recursive(class array<T> &array,
    class array<T>::p_comparator_func comparator)

    insertion_sort_recursive(array, array.get_capacity(), comparator);



    My custom comparator:



    template <typename T>
    bool custom_comparator(T a, T b)

    return a < b;



    And where I'm calling it in main:



    class array<int> a(5);
    a[0] = 8;
    a[1] = 6;
    a[2] = 7;
    a[3] = 1;
    a[4] = 3;

    std::cout << "attempting sort" << std::endl;
    a.sort(wrap_insertion_sort_recursive<int>, custom_comparator<int>);









    share|improve this question

























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      I'm trying to create a member method on my array class for sorting. I typedef'd two function pointers in my class one for a generic sorting method, and the other for the comparator. I'm having trouble navigating through the errors to determine exactly what is wrong with the way I'm calling it. I hope I've provided enough information, but here's what I got.



      The error I'm getting:



      main.cpp: In function ‘int main(int, char**)’:
      main.cpp:222:67: error: no matching function for call to ‘array<int>::sort(<unresolved overloaded function type>, <unresolved overloaded function type>)’
      sort(wrap_insertion_sort_recursive<int>, custom_comparator<int>);
      ^
      main.cpp:55:6: note: candidate: void array<T>::sort(array<T>::p_sort_func, array<T>::p_comparator_func) [with T = int; array<T>::p_sort_func = void (*)(array<int>&, bool (*)(int, int)); array<T>::p_comparator_func = bool (*)(int, int)]
      void array<T>::sort(array<T>::p_sort_func sort_func,
      ^~~~~~~~
      main.cpp:55:6: note: no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘array<int>::p_sort_func aka void (*)(array<int>&, bool (*)(int, int))’


      I'm defining my typedefs here:



      template <typename T>
      class array
      public:
      typedef bool (*p_comparator_func)(T a, T b);
      typedef void (*p_sort_func)(class array<T> &array, p_comparator_func);
      ...
      void sort(array::p_sort_func sort_func,
      array::p_comparator_func comparator_func);

      ...



      My implementation of sort:



      template <typename T>
      void array<T>::sort(array<T>::p_sort_func sort_func,
      array<T>::p_comparator_func comparator_func)

      if(comparator_func == nullptr)
      comparator_func = this->default_comparator;


      if(sort_func == nullptr)
      sort_func = this->default_sort;


      sort_func(*this, comparator_func);



      The sort function I am passing:



      template <typename T>
      void wrap_insertion_sort_recursive(class array<T> &array,
      class array<T>::p_comparator_func comparator)

      insertion_sort_recursive(array, array.get_capacity(), comparator);



      My custom comparator:



      template <typename T>
      bool custom_comparator(T a, T b)

      return a < b;



      And where I'm calling it in main:



      class array<int> a(5);
      a[0] = 8;
      a[1] = 6;
      a[2] = 7;
      a[3] = 1;
      a[4] = 3;

      std::cout << "attempting sort" << std::endl;
      a.sort(wrap_insertion_sort_recursive<int>, custom_comparator<int>);









      share|improve this question















      I'm trying to create a member method on my array class for sorting. I typedef'd two function pointers in my class one for a generic sorting method, and the other for the comparator. I'm having trouble navigating through the errors to determine exactly what is wrong with the way I'm calling it. I hope I've provided enough information, but here's what I got.



      The error I'm getting:



      main.cpp: In function ‘int main(int, char**)’:
      main.cpp:222:67: error: no matching function for call to ‘array<int>::sort(<unresolved overloaded function type>, <unresolved overloaded function type>)’
      sort(wrap_insertion_sort_recursive<int>, custom_comparator<int>);
      ^
      main.cpp:55:6: note: candidate: void array<T>::sort(array<T>::p_sort_func, array<T>::p_comparator_func) [with T = int; array<T>::p_sort_func = void (*)(array<int>&, bool (*)(int, int)); array<T>::p_comparator_func = bool (*)(int, int)]
      void array<T>::sort(array<T>::p_sort_func sort_func,
      ^~~~~~~~
      main.cpp:55:6: note: no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘array<int>::p_sort_func aka void (*)(array<int>&, bool (*)(int, int))’


      I'm defining my typedefs here:



      template <typename T>
      class array
      public:
      typedef bool (*p_comparator_func)(T a, T b);
      typedef void (*p_sort_func)(class array<T> &array, p_comparator_func);
      ...
      void sort(array::p_sort_func sort_func,
      array::p_comparator_func comparator_func);

      ...



      My implementation of sort:



      template <typename T>
      void array<T>::sort(array<T>::p_sort_func sort_func,
      array<T>::p_comparator_func comparator_func)

      if(comparator_func == nullptr)
      comparator_func = this->default_comparator;


      if(sort_func == nullptr)
      sort_func = this->default_sort;


      sort_func(*this, comparator_func);



      The sort function I am passing:



      template <typename T>
      void wrap_insertion_sort_recursive(class array<T> &array,
      class array<T>::p_comparator_func comparator)

      insertion_sort_recursive(array, array.get_capacity(), comparator);



      My custom comparator:



      template <typename T>
      bool custom_comparator(T a, T b)

      return a < b;



      And where I'm calling it in main:



      class array<int> a(5);
      a[0] = 8;
      a[1] = 6;
      a[2] = 7;
      a[3] = 1;
      a[4] = 3;

      std::cout << "attempting sort" << std::endl;
      a.sort(wrap_insertion_sort_recursive<int>, custom_comparator<int>);






      c++






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      edited Nov 12 at 5:18

























      asked Nov 12 at 5:10









      jacob

      2,3691421




      2,3691421






















          1 Answer
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          The problem specifically was with:



          template <typename T>
          void wrap_insertion_sort_recursive(class array<T> &array,
          class array<T>::p_comparator_func comparator)

          insertion_sort_recursive(array, array.get_capacity(), comparator);



          Instead of class I should have used typename as described in this nice article all about typename here.



          So the fixed version would be:



          template <typename T>
          void wrap_insertion_sort_recursive(class array<T> &array,
          typename array<T>::p_comparator_func comparator)

          insertion_sort_recursive(array, array.get_capacity(), comparator);






          share|improve this answer




















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            1 Answer
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            up vote
            0
            down vote













            The problem specifically was with:



            template <typename T>
            void wrap_insertion_sort_recursive(class array<T> &array,
            class array<T>::p_comparator_func comparator)

            insertion_sort_recursive(array, array.get_capacity(), comparator);



            Instead of class I should have used typename as described in this nice article all about typename here.



            So the fixed version would be:



            template <typename T>
            void wrap_insertion_sort_recursive(class array<T> &array,
            typename array<T>::p_comparator_func comparator)

            insertion_sort_recursive(array, array.get_capacity(), comparator);






            share|improve this answer
























              up vote
              0
              down vote













              The problem specifically was with:



              template <typename T>
              void wrap_insertion_sort_recursive(class array<T> &array,
              class array<T>::p_comparator_func comparator)

              insertion_sort_recursive(array, array.get_capacity(), comparator);



              Instead of class I should have used typename as described in this nice article all about typename here.



              So the fixed version would be:



              template <typename T>
              void wrap_insertion_sort_recursive(class array<T> &array,
              typename array<T>::p_comparator_func comparator)

              insertion_sort_recursive(array, array.get_capacity(), comparator);






              share|improve this answer






















                up vote
                0
                down vote










                up vote
                0
                down vote









                The problem specifically was with:



                template <typename T>
                void wrap_insertion_sort_recursive(class array<T> &array,
                class array<T>::p_comparator_func comparator)

                insertion_sort_recursive(array, array.get_capacity(), comparator);



                Instead of class I should have used typename as described in this nice article all about typename here.



                So the fixed version would be:



                template <typename T>
                void wrap_insertion_sort_recursive(class array<T> &array,
                typename array<T>::p_comparator_func comparator)

                insertion_sort_recursive(array, array.get_capacity(), comparator);






                share|improve this answer












                The problem specifically was with:



                template <typename T>
                void wrap_insertion_sort_recursive(class array<T> &array,
                class array<T>::p_comparator_func comparator)

                insertion_sort_recursive(array, array.get_capacity(), comparator);



                Instead of class I should have used typename as described in this nice article all about typename here.



                So the fixed version would be:



                template <typename T>
                void wrap_insertion_sort_recursive(class array<T> &array,
                typename array<T>::p_comparator_func comparator)

                insertion_sort_recursive(array, array.get_capacity(), comparator);







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 12 at 7:01









                jacob

                2,3691421




                2,3691421



























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