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#include <math.h>
#include <stdio.h>
#include <time.h>
#include <stc/crand.h>
#define i_tag ic
#define i_key uint64_t
#define i_val int
#include <stc/cmap.h>
static uint64_t seed = 12345;
static void test_repeats(void)
{
enum {BITS = 46, BITS_TEST = BITS/2 + 2};
static const uint64_t N = 1ull << BITS_TEST;
static const uint64_t mask = (1ull << BITS) - 1;
printf("birthday paradox: value range: 2^%d, testing repeats of 2^%d values\n", BITS, BITS_TEST);
crand_t rng = crand_init(seed);
cmap_ic m = cmap_ic_with_capacity(N);
c_forrange (i, N) {
uint64_t k = crand_u64(&rng) & mask;
int v = cmap_ic_insert(&m, k, 0).ref->second += 1;
if (v > 1) printf("repeated value %" PRIu64 " (%d) at 2^%d\n",
k, v, (int)log2((double)i));
}
cmap_ic_drop(&m);
}
#define i_key uint32_t
#define i_val uint64_t
#define i_tag x
#include <stc/cmap.h>
void test_distribution(void)
{
enum {BITS = 26};
printf("distribution test: 2^%d values\n", BITS);
crand_t rng = crand_init(seed);
const size_t N = 1ull << BITS ;
cmap_x map = {0};
c_forrange (N) {
uint64_t k = crand_u64(&rng);
cmap_x_insert(&map, k & 0xf, 0).ref->second += 1;
}
uint64_t sum = 0;
c_foreach (i, cmap_x, map) sum += i.ref->second;
sum /= (uint64_t)map.size;
c_foreach (i, cmap_x, map) {
printf("%4" PRIu32 ": %" PRIu64 " - %" PRIu64 ": %11.8f\n",
i.ref->first, i.ref->second, sum,
(1.0 - (double)i.ref->second / (double)sum));
}
cmap_x_drop(&map);
}
int main(void)
{
seed = (uint64_t)time(NULL);
test_distribution();
test_repeats();
}
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