templated quick sort error

This is a discussion on templated quick sort error within the C++ Programming forums, part of the General Programming Boards category; Hey there. I'm getting some odd errors trying to work on a quick sort example. It seems like I'm not ...

  1. #1
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    templated quick sort error - solved

    Hey there. I'm getting some odd errors trying to work on a quick sort example. It seems like I'm not using my templated parameters correctly. It's making T an int* when I want T to be just int. I thought by using <class T> and <T* arr ... I would be able to get a pointer of type T. When I call quick sort I'm passing a reference to T, so that I can change the values in the sorted arrays. I'm guessing this is the error, but ... yeah. I've rambled enough.

    -edit-

    So, in case anyone googles for these errors ...

    don't pass arrays by address into templated functions. The pointers seem to work just fine.

    Problem solved.


    Code:
    "exampleSort.c", line 88: error: initialization with "{...}" expected for
              aggregate object
            T pivot = array[startIndex];//pivot element is the leftmost element
                      ^
              detected during instantiation of
                        "void QuickSort(T *, int, int) [with T=int [10]]"
    
    "exampleSort.c", line 95: error: no instance of function template "SplitArray"
              matches the argument list
                argument types are: (int (*)[10], int [10], int, int)
                    splitPoint = SplitArray(array, pivot, startIndex, endIndex);
                                 ^
              detected during instantiation of
                        "void QuickSort(T *, int, int) [with T=int [10]]"
    
    "exampleSort.c", line 99: error: expression must be a modifiable lvalue
                    array[splitPoint] = pivot;
                    ^
              detected during instantiation of
                        "void QuickSort(T *, int, int) [with T=int [10]]"
    Last edited by gesangbaer; 07-04-2010 at 01:39 AM. Reason: Solved

  2. #2
    C++まいる!Cをこわせ! Elysia's Avatar
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    22,604
    You can pass arrays by address into templated functions.
    Code, please.
    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.

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