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Pointer arrays...

Posted on 2004-10-12
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Last Modified: 2010-04-01
I have 7 pointer arrays which for a particular method, I will have to condense into one....

char *configFilegr = {"GR_1"..}
char *configFilegr2 = ....

How would I do that???
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Question by:jewee
2 Comments
 
LVL 86

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jkr earned 500 total points
ID: 12289949
You could use a function like

char** merge_arrays( char** p1, unsigned int n1, char** p2, unsigned int n2) {

    char** p = new char*[n1 + n2];

    memcpy(p, p1, n1);
    memcpy(p + n1, p2, n2);
}

But, I'd *strongly* advise to use std::vecors or any other STL container for that, since they're way easier to handle
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LVL 17

Expert Comment

by:rstaveley
ID: 12291015
Here's a std::vector approach...

--------8<--------
#include <iostream>
#include <vector>
#include <iterator>
using namespace std;

template <typename T>
vector<T> merge_arrays(T* arr1,size_t arr1_sz,T* arr2,size_t arr2_sz)
{
      vector<T> retval;
      retval.reserve(arr1_sz+arr2_sz);
      retval.insert(retval.end(),arr1,arr1+arr1_sz);
      retval.insert(retval.end(),arr2,arr2+arr2_sz);
      return retval;
}

int main()
{
      const char *arr1[] = {"one","two"};
      const char *arr2[] = {"three","four","five"};
      vector<const char*> v = merge_arrays(arr1,2,arr2,3);
      cout << "Counting: ";
      copy(v.begin(),v.end(),ostream_iterator<const char*>(cout," "));
      cout << '\n';
}
--------8<--------
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