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new for_hm macro

banana-cakes
Felix Brendel vor 6 Jahren
Ursprung
dd7db5b330
Commit
5519e8640a
1 geänderte Dateien mit 13 neuen und 167 gelöschten Zeilen
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  1. +13
    -167
      hashmap.hpp

+ 13
- 167
hashmap.hpp Datei anzeigen

@@ -1,25 +1,18 @@
#pragma once

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "types.hpp"


// inline void print_hm(StringHashMap* hm) {
// for_str_hash_map(hm) {
// printf("index: %d desired-index: %llu key: %s hash: %llu value: %llu\n", i, (hm->data[i].hash % hm->current_capacity), (char*)key, hm->data[i].hash, (unsigned long long)value);
// }
// }

#define __for_hm_generator(key_type, value_type, hm) \
if (key_type key = 0); else \
if (value_type value = 0); else \
for(int index = 0; index < hm.current_capacity; ++index) \
if (!((!hm.data[index].deleted) && \
(key = hm.data[index].original) && \
#define for_hash_map(hm) \
if (decltype(hm.data[0].original) key = 0); else \
if (decltype(hm.data[0].object) value = 0); else \
for(int index = 0; index < hm.current_capacity; ++index) \
if (!((!hm.data[index].deleted) && \
(key = hm.data[index].original) && \
(value = hm.data[index].object))); else


template <typename key_type, typename value_type>
struct Hash_Map {
int current_capacity;
@@ -81,11 +74,12 @@ struct Hash_Map {
}

bool key_exists(key_type key) {
return get_index_of_living_cell_if_it_exists(key, hm_hash(key)) != -1;
return get_index_of_living_cell_if_it_exists(key, hm_hash((key_type)key)) != -1;
}

value_type get_object(key_type key) {
int index = get_index_of_living_cell_if_it_exists(key, hm_hash(key));

int index = get_index_of_living_cell_if_it_exists(key, hm_hash((key_type)key));
if (index != -1) {
return data[index].object;
}
@@ -93,14 +87,14 @@ struct Hash_Map {
}

void delete_object(key_type key) {
int index = get_index_of_living_cell_if_it_exists(key, hm_hash(key));
int index = get_index_of_living_cell_if_it_exists(key, hm_hash((key_type)key));
if (index != -1) {
data[index].deleted = true;
}
}

void set_object(key_type key, value_type obj) {
u64 hash_val = hm_hash(key);
u64 hash_val = hm_hash((key_type)key);
int index = hash_val % current_capacity;

/* if we the desired cell is just empty, write to it and done :) */
@@ -132,7 +126,7 @@ struct Hash_Map {
}
/* search for empty slot for new cell starting at desired index; */
/* preventing gotos using lambdas! */
[&](){
[&]{
for (int i = index; i < current_capacity; ++i) {
if (!data[i].original ||
hm_objects_match(data[i].original, key))
@@ -160,151 +154,3 @@ struct Hash_Map {
}

};

// #define define_hash_map(type, name) \
// bool hm_objects_match(type,type); \
// u32 hm_hash(type); \
// \
// struct name##_Hash_Map_Cell { \
// type original; \
// u64 hash; \
// bool deleted; \
// void* object; \
// }; \
// \
// struct name##_Hash_Map { \
// int current_capacity; \
// int cell_count; \
// name##_Hash_Map_Cell* data; \
// }; \
// \
// name##_Hash_Map* create_##name##_hashmap(int initial_capacity=8) { \
// name##_Hash_Map* hm = new name##_Hash_Map; \
// hm->current_capacity = initial_capacity; \
// hm->cell_count = 0; \
// /* set all data to nullptr */ \
// hm->data = (name##_Hash_Map_Cell*)calloc(initial_capacity, sizeof(name##_Hash_Map_Cell)); \
// /* printf("check: %s\n", hm->data[6].original_string); */ \
// return hm; \
// } \
// \
// int hm_get_index_of_living_cell_if_it_exists(name##_Hash_Map* hm, type key, u64 hash_val) { \
// int index = hash_val % hm->current_capacity; \
// name##_Hash_Map_Cell cell = hm->data[index]; \
// /* test if cell exists at that index */ \
// if (cell.original) { \
// /* check if strings match */ \
// if (hm_objects_match(key, cell.original)) { \
// /* we found it, now check it it is deleted: */ \
// if (cell.deleted) { \
// /* we found it but it was deleted, we */ \
// /* dont have to check for collisions then */ \
// return -1; \
// } else { \
// /* we found it and it is not deleted */ \
// return index; \
// } \
// } else { \
// /* strings dont match, this means we have */ \
// /* a collision. We just search forward */ \
// for (int i = 0; i < hm->current_capacity; ++i) { \
// int new_idx = (i + index) % hm->current_capacity; \
// cell = hm->data[new_idx]; \
// if (!cell.original) \
// return -1; \
// if (!hm_objects_match(key, cell.original)) \
// continue; \
// if (cell.deleted) \
// continue; \
// return new_idx; \
// } \
// /* not or only deleted cells found */ \
// return -1; \
// } \
// } else { \
// /* no cell exists at this index so the item was never in the */ \
// /* hashmap. Either it would be there or be ther and 'deleted' */ \
// /* or another item would be there and therefore a collistion */ \
// /* would exist */ \
// return -1; \
// } \
// } \
// \
// inline bool hm_key_exists(name##_Hash_Map* hm, type key) { \
// return hm_get_index_of_living_cell_if_it_exists(hm, key, hm_hash(key)) != -1; \
// } \
// \
// inline void* hm_get_object(name##_Hash_Map* hm, type key) { \
// int index = hm_get_index_of_living_cell_if_it_exists(hm, key, hm_hash(key)); \
// if (index != -1) { \
// return hm->data[index].object; \
// } \
// return nullptr; \
// } \
// \
// inline void hm_delete_object(name##_Hash_Map* hm, type key) { \
// int index = hm_get_index_of_living_cell_if_it_exists(hm, key, hm_hash(key)); \
// if (index != -1) { \
// hm->data[index].deleted = true; \
// } \
// } \
// \
// void hm_set(name##_Hash_Map* hm, type key, void* obj) { \
// u64 hash_val = hm_hash(key); \
// int index = hash_val % hm->current_capacity; \
// \
// /* if we the desired cell is just empty, write to it and done :) */ \
// if (!hm->data[index].original) { \
// /* insert new cell into desired slot */ \
// ++hm->cell_count; \
// } else { \
// if (hm_objects_match(key, hm->data[index].original)) { \
// /* overwrite object with same key, dont increment cell */ \
// /* count */ \
// } else { \
// /* collision, check resize */ \
// ++hm->cell_count; \
// if ((hm->cell_count*1.0f / hm->current_capacity) > 0.666f) { \
// auto old_data = hm->data; \
// hm->data = (name##_Hash_Map_Cell*)calloc(hm->current_capacity*4, sizeof(name##_Hash_Map_Cell)); \
// hm->cell_count = 0; \
// hm->current_capacity *= 4; \
// \
// /* insert all old items again */ \
// for (int i = 0; i < hm->current_capacity/4; ++i) { \
// auto cell = old_data[i]; \
// if (cell.original) { \
// hm_set(hm, cell.original, cell.object); \
// } \
// } \
// free(old_data); \
// index = hash_val % hm->current_capacity; \
// } \
// /* search for empty slot for new cell starting at desired index; */ \
// /* preventing gotos using lambdas! */ \
// [&](){ \
// for (int i = index; i < hm->current_capacity; ++i) { \
// if (!hm->data[i].original || \
// hm_objects_match(hm->data[i].original, key)) \
// { \
// index = i; \
// return; \
// } \
// } \
// for (int i = 0; i < index; ++i) { \
// if (!hm->data[i].original || \
// hm_objects_match(hm->data[i].original, key)) \
// { \
// index = i; \
// return; \
// } \
// } \
// }(); \
// } \
// } \
// \
// hm->data[index].deleted = false; \
// hm->data[index].original = key; \
// hm->data[index].hash = hash_val; \
// hm->data[index].object = obj; \
// } \

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