example.c

/*******************************************************************************
Copyright (c) 2016 Jannis Mohlin Tsiroyannis

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
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the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 ******************************************************************************/

/*
Output of this program:
Map had "Some string key" mapped to 1
Map had "Another string key" mapped to 2
 */


#include <string.h>
#include <stdio.h>
#include "map_template.h"

// A hash function for whatever type is used as KEYS
static unsigned string_hash(const char* str)
{
   unsigned result = 0;
   unsigned exponent = 1;
   while(*str != '\0')
   {
      result += *(str++) * exponent;
      exponent *= 2;
   }
   return result;
}

// In header files needing access to the map:
_DECLARE_MAP(int, const char*, struct StrMap, str_map)

// In ONE c file:
_IMPLEMENT_MAP(int, const char*, struct StrMap, str_map, strcmp, string_hash)

int main()
{
   // Create a table, with initial size 10 and dynamically growing
   struct StrMap map = str_map_create(10, 1);

   // Insert data
   const char* key0 = "Some string key";
   const char* key1 = "Another string key";
   str_map_insert(&map, 1, key0);
   str_map_insert(&map, 2, key1);

   // Get data
   int value0;
   int value1;
   if ( str_map_get(&map, key0, &value0) == 0 )
      printf("Map had \"%s\" mapped to %d\n", key0, value0);
   if ( str_map_get(&map, key1, &value1) == 0 )
      printf("Map had \"%s\" mapped to %d\n", key1, value1);

   return 0;
}