c++ - Porting std::map to C?

Question

I am porting some c++ code to c. What is a viable equivalent of std::map in c? I know there is no equivalent in c.

This is what I am thinking of using:

In c++:

std::map< uint, sTexture > m_Textures;

In c:

typedef struct
{
  uint* intKey;
  sTexture* textureValue;
} sTMTextureMap;

Is that viable or am I simplifying map too much? Just in case you did not get the purpose its a Texture Map.

Answer 1

Many C implementations support tsearch(3) or hsearch(3). tsearch(3) is a binary tree and you can provide a comparator callback. I think that's about as close as you're going to get to a std::map.

Here's some c99 example code

#include <search.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>

typedef struct
{
      int key;
      char* value;
} intStrMap;

int compar(const void *l, const void *r)
{
    const intStrMap *lm = l;
    const intStrMap *lr = r;
    return lm->key - lr->key;
}

int main(int argc, char **argv)
{
    void *root = 0;

    intStrMap *a = malloc(sizeof(intStrMap));
    a->key = 2;
    a->value = strdup("two");
    tsearch(a, &root, compar); /* insert */

    intStrMap *find_a = malloc(sizeof(intStrMap));
    find_a->key = 2;

    void *r = tfind(find_a, &root, compar); /* read */
    printf("%s", (*(intStrMap**)r)->value);

    return 0;
}