pairing-heap.h

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// The MIT License (MIT)
// Copyright (c) 2018 Maksim Andrianov
//
// 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 use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of 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.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// 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.
#ifndef CDCONTAINERS_INCLUDE_CDCONTAINERS_PAIRING_HEAP_H
#define CDCONTAINERS_INCLUDE_CDCONTAINERS_PAIRING_HEAP_H

#include <cdcontainers/common.h>
#include <cdcontainers/status.h>

#include <assert.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdlib.h>

struct cdc_pairing_heap_node {
  struct cdc_pairing_heap_node *parent;
  struct cdc_pairing_heap_node *child;
  struct cdc_pairing_heap_node *sibling;
  void *key;
};

struct cdc_pairing_heap {
  struct cdc_pairing_heap_node *root;
  size_t size;
  struct cdc_data_info *dinfo;
};

struct cdc_pairing_heap_iter {
  struct cdc_pairing_heap *container;
  struct cdc_pairing_heap_node *current;
};

enum cdc_stat cdc_pairing_heap_ctor(struct cdc_pairing_heap **h,
                                    struct cdc_data_info *info);

enum cdc_stat cdc_pairing_heap_ctorl(struct cdc_pairing_heap **h,
                                     struct cdc_data_info *info, ...);

enum cdc_stat cdc_pairing_heap_ctorv(struct cdc_pairing_heap **h,
                                     struct cdc_data_info *info, va_list args);

void cdc_pairing_heap_dtor(struct cdc_pairing_heap *h);

// Element access
static inline void *cdc_pairing_heap_top(struct cdc_pairing_heap *h)
{
  assert(h != NULL);

  return h->root->key;
}

// Capacity
static inline size_t cdc_pairing_heap_size(struct cdc_pairing_heap *h)
{
  assert(h != NULL);

  return h->size;
}

static inline bool cdc_pairing_heap_empty(struct cdc_pairing_heap *h)
{
  assert(h != NULL);

  return h->size == 0;
}

// Modifiers
enum cdc_stat cdc_pairing_heap_extract_top(struct cdc_pairing_heap *h);

enum cdc_stat cdc_pairing_heap_riinsert(struct cdc_pairing_heap *h, void *key,
                                        struct cdc_pairing_heap_iter *ret);

static inline enum cdc_stat cdc_pairing_heap_insert(struct cdc_pairing_heap *h,
                                                    void *key)
{
  assert(h != NULL);

  return cdc_pairing_heap_riinsert(h, key, NULL);
}

void cdc_pairing_heap_change_key(struct cdc_pairing_heap *h,
                                 struct cdc_pairing_heap_iter *pos, void *key);

void cdc_pairing_heap_clear(struct cdc_pairing_heap *h);

void cdc_pairing_heap_swap(struct cdc_pairing_heap *a,
                           struct cdc_pairing_heap *b);

// Operations
void cdc_pairing_heap_merge(struct cdc_pairing_heap *h,
                            struct cdc_pairing_heap *other);

bool cdc_pairing_heap_is_heap(struct cdc_pairing_heap *h);

// Iterators
static inline void *cdc_pairing_heap_iter_data(struct cdc_pairing_heap_iter *it)
{
  assert(it != NULL);

  return it->current->key;
}

static inline bool cdc_pairing_heap_iter_is_eq(
    struct cdc_pairing_heap_iter *it1, struct cdc_pairing_heap_iter *it2)
{
  assert(it1 != NULL);
  assert(it2 != NULL);

  return it1->container == it2->container && it1->current == it2->current;
}

// Short names
#ifdef CDC_USE_SHORT_NAMES
typedef struct cdc_pairing_heap pairing_heap_t;
typedef struct cdc_pairing_heap_iter pairing_heap_iter;

#define pairing_heap_ctor(...) cdc_pairing_heap_ctor(__VA_ARGS__)
#define pairing_heap_ctorl(...) cdc_pairing_heap_ctorl(__VA_ARGS__)
#define pairing_heap_ctorv(...) cdc_pairing_heap_ctorv(__VA_ARGS__)
#define pairing_heap_dtor(...) cdc_pairing_heap_dtor(__VA_ARGS__)

// Element access
#define pairing_heap_top(...) cdc_pairing_heap_top(__VA_ARGS__)

// Capacity
#define pairing_heap_empty(...) cdc_pairing_heap_empty(__VA_ARGS__)
#define pairing_heap_size(...) cdc_pairing_heap_size(__VA_ARGS__)

// Modifiers
#define pairing_heap_extract_top(...) cdc_pairing_heap_extract_top(__VA_ARGS__)
#define pairing_heap_riinsert(...) cdc_pairing_heap_riinsert(__VA_ARGS__)
#define pairing_heap_insert(...) cdc_pairing_heap_insert(__VA_ARGS__)
#define pairing_heap_change_key(...) cdc_pairing_heap_change_key(__VA_ARGS__)
#define pairing_heap_clear(...) cdc_pairing_heap_clear(__VA_ARGS__)
#define pairing_heap_swap(...) cdc_pairing_heap_swap(__VA_ARGS__)

// Operations
#define pairing_heap_merge(...) cdc_pairing_heap_merge(__VA_ARGS__)

#define pairing_heap_is_heap(...) cdc_pairing_heap_is_heap(__VA_ARGS__)

// Iterators
#define pairing_heap_iter_data(...) cdc_pairing_heap_iter_data(__VA_ARGS__)
#define pairing_heap_iter_is_eq(...) cdc_pairing_heap_iter_is_eq(__VA_ARGS__)
#endif

#endif  // CDCONTAINERS_INCLUDE_CDCONTAINERS_PAIRING_HEAP_H