error: no matching function for call to ''

[bombatwist]

Hello, i am new to this forum and trying to create a merge sort function.

Upon testing, i get this error.

" error: no matching function for call to 'merge(List&, List&)' "

when i try to call it in the main, this is how it looks

List list1;
List list2;
...(bunch of code that fills both lists above with values)...
List merged_list = merge( list1, list2); 

in my list.h file, it looks like this

List& merge( const List* one, const List* two );

and here is the list.cpp

List& merge( const List* one, const List* two )
{
...(bunch of code for merge sorting)....
return *newList;
}

what am i doing wrong? thanks!

[tummychow]

I'm not sure if it will actually change anything because I never pass by pointer, but there is no call for REFERENCE parameter, not pointer. Try changing those pointers in your arg list to references and see what happens.

[bombatwist]

the same thing happened :(.

I want to write it in a way so that the function has two parameters, that both point to two seperate lists, and i want it to return a pointer to the new merged list.

[tummychow]

Hm. Maybe it's a problem with the includes. I hate to ask such a simple question but did you link the merge implementation with your main source code? (I gotta be missing something simple but for the life of me I can't think of it.)

[bombatwist]

no i did not.

my merge implementation is in my list.cpp. and in my main, i used iostream and list.h as my include. All function calls to other functions in the list.cpp work except this one. :(

[Zhuge]

You aren't passing the addresses of the List objects list1 and list2. Use &list1 and &list2 when calling the function and see if that works.

[bombatwist]

hmm, i did that and i get this error now

" undefined reference to 'List::merge(List const*, List,const*)' "

@_@

[tummychow]

Well that solved one problem. Is merge a member of your list class?

[bombatwist]

ahh no it wasn't. that fixed my problem. thanks guys!