chooseln_cache.h

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#ifndef CHOOSELN_CACHE_H_2C3C614A_C14D_477A_B8A0_30AE50238D9E
#define CHOOSELN_CACHE_H_2C3C614A_C14D_477A_B8A0_30AE50238D9E

#include <assert.h>

#include <mathfunc.h>
#include <memalloc.h>

struct chooseln_cache {
    double** values;
    int size;
};

int chooseln_is_init2(struct chooseln_cache *cache);
int get_chooseln_cache_size2(struct chooseln_cache *cache);
void chooseln_cache_init2(struct chooseln_cache *cache, int size);
void chooseln_cache_resize2(struct chooseln_cache *cache, int resize);
void chooseln_cache_free2(struct chooseln_cache *cache);

static inline double chooseln_get2(struct chooseln_cache *cache, int n, int x)
{
    assert(n < cache->size * 2);
    assert(x <= cache->size);
    if (cache->values[n] && cache->values[n][x] >= 0) return cache->values[n][x];
    if (cache->values[n] == NULL)
    {
        int i;
        cache->values[n] = (double*)memory_new(cache->size + 1, sizeof(double));
        for (i = 0; i <= cache->size; i++) 
            cache->values[n][i] = -1.0;
    }
    cache->values[n][x] = chooseln(n, x);
    return cache->values[n][x];
}

#endif