src/Stack.h

   1 /**
   2  * @file Stack.h
   3  */
   4
   5 #ifndef CGDS_STACK_H
   6 #define CGDS_STACK_H
   7
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include "cgds/types.h"
  11 #include "cgds/safe_alloc.h"
  12 #include "cgds/Vector.h"
  13
  14 /**
  15  * @brief Stack containing generic data.
  16  */
  17 typedef struct Stack {
  18   size_t dataSize; ///< Size in bytes of a stack element.
  19   Vector* array; ///< Internal data structure: resizeable array.
  20 } Stack;
  21
  22 /**
  23  * @brief Initialize an empty stack.
  24  */
  25 void _stack_init(
  26   Stack* stack, ///< "this" pointer.
  27   size_t dataSize ///< Size in bytes of a stack element.
  28 );
  29
  30 /**
  31  * @brief Return an allocated and initialized stack.
  32  */
  33 Stack* _stack_new(
  34   size_t dataSize ///< Size in bytes of a stack element.
  35 );
  36
  37 /**
  38  * @brief Return an allocated and initialized stack.
  39  * @param type Type of a stack element (int, char*, ...).
  40  *
  41  * Usage: Stack* stack_new(<Type> type)
  42  */
  43 #define stack_new(type) \
  44   _stack_new(sizeof(type))
  45
  46 /**
  47  * @brief Copy constructor (shallow copy, ok for basic types).
  48  */
  49 Stack* stack_copy(
  50   Stack* stack ///< "this" pointer.
  51 );
  52
  53 /**
  54  * @brief Check if the stack is empty.
  55  */
  56 bool stack_empty(
  57   Stack* stack ///< "this" pointer.
  58 );
  59
  60 /**
  61  * @brief Return size of the current stack.
  62  */
  63 UInt stack_size(
  64   Stack* stack ///< "this" pointer.
  65 );
  66
  67 /**
  68  * @brief Add something on top of the stack.
  69  */
  70 void _stack_push(
  71   Stack* stack, ///< "this" pointer.
  72   void* data ///< Data to be added.
  73 );
  74
  75 /**
  76  * @brief Add something on top of the stack.
  77  * @param stack "this" pointer.
  78  * @param data Data to be added.
  79  *
  80  * Usage: void stack_push(Stack* stack, void data)
  81  */
  82 #define stack_push(stack, data) \
  83 { \
  84   typeof(data) tmp = data; \
  85   _stack_push(stack, &tmp); \
  86 }
  87
  88 /**
  89  * @brief Return what is on top of the stack.
  90  */
  91 void* _stack_top(
  92   Stack* stack ///< "this" pointer.
  93 );
  94
  95 /**
  96  * @brief Return what is on top of the stack.
  97  * @param stack "this" pointer.
  98  * @param data Data to be assigned.
  99  *
 100  * Usage: void stack_top(Stack* stack, void data)
 101  */
 102 #define stack_top(stack, data) \
 103 { \
 104   void* pData = _stack_top(stack); \
 105   data = *((typeof(&data))pData); \
 106 }
 107
 108 /**
 109  * @brief Remove the top of the stack.
 110  */
 111 void stack_pop(
 112   Stack* stack ///< "this" pointer.
 113 );
 114
 115 /**
 116  * @brief Clear the entire stack.
 117  */
 118 void stack_clear(
 119   Stack* stack ///< "this" pointer.
 120 );
 121
 122 /**
 123  * @brief Destroy the stack: clear it, and free 'stack' pointer.
 124  */
 125 void stack_destroy(
 126   Stack* stack ///< "this" pointer.
 127 );
 128
 129 #endif