connecting c and c++ functions

[baxy]

Hi,


I have this function which is a part of an older lib. the thing is this function accepts char***, allocates the required memory and fills it up. However i need to accept this char*** as a 2D vector of strings, but I am having hard time makeing it work. Could anyone help me with this one.


example:

C:

function (char*** results){

results = (char ***) malloc(sizeof(char **)*num);
for (index=0; index<num; index++) {
   results[index] = (char **)malloc(sizeof(char*)*size);
   for (i=0; i<size; i++) {
       results[index][i] = (char *)malloc(sizeof(char)*x));
       // fill
   }
}


C++:

vector<vector<string>> results;

function(&results);
cout << results[0][0]<< endl;

thank you!

[jimblumberg]

However i need to accept this char*** as a 2D vector of strings,

Why?

If you want to stick with std::string you would probably be better off rewriting the "fill" to handle the C++ std::string. Since you want to use a vector you won't need any of the malloc() calls, since the vector will manage it's own memory.

If you for some reason need to stick with this function then I suggest you stick with the array of C-strings. If necessary after the function call you could convert the array of C-string to a vector<vector<string>> and then free all the associated memory.

But without seeing more of the function I can't really tell you how to proceed.

Jim