include/selvalue.h

   1 /*
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  31 /*! \file
  32  * \brief Declaration of \c gmx_ana_selvalue_t.
  33  *
  34  * There should be no need to use the data structures in this file directly
  35  * unless implementing a custom selection routine.
  36  */
  37 #ifndef SELVALUE_H
  38 #define SELVALUE_H
  39
  40 #include <typedefs.h>
  41
  42 #ifdef __cplusplus
  43 extern "C"
  44 {
  45 #endif
  46
  47 /*! Defines the value type of a different selection objects.*/
  48 typedef enum
  49 {
  50     NO_VALUE,           /*!< No value; either an error condition or an boolean
  51                              parameter.*/
  52     INT_VALUE,          /*!< One or more integer values.*/
  53     REAL_VALUE,         /*!< One or more real values.*/
  54     STR_VALUE,          /*!< One or more string values.*/
  55     POS_VALUE,          /*!< One or more position values.*/
  56     GROUP_VALUE,        /*!< One group of atoms.*/
  57 } e_selvalue_t;
  58
  59 /*! \brief
  60  * Describes a value of a selection expression or of a selection method
  61  * parameter.
  62  *
  63  * Which field in the union is used depends on the \p type.
  64  */
  65 typedef struct gmx_ana_selvalue_t
  66 {
  67     /*! Type of the value.*/
  68     e_selvalue_t                type;
  69     /*! \brief
  70      * Number of values in the array pointed by the union.
  71      *
  72      * Note that for position and group values, it is the number of
  73      * data structures in the array, not the number of positions or
  74      * the number of atoms in the group.
  75      */
  76     int                         nr;
  77     /*! Pointer to the value.*/
  78     union {
  79         /*! Integer value(s) (type \ref INT_VALUE).*/
  80         int                    *i;
  81         /*! Real value(s) (type \ref REAL_VALUE).*/
  82         real                   *r;
  83         /*! String value(s) (type \ref STR_VALUE).*/
  84         char                  **s;
  85         /*! Structure for the position value(s) (type \ref POS_VALUE).*/
  86         struct gmx_ana_pos_t   *p;
  87         /*! Group value (type \ref GROUP_VALUE).*/
  88         struct gmx_ana_index_t *g;
  89         /*! Boolean value (only parameters of type \ref NO_VALUE);*/
  90         bool                   *b;
  91         /*! Generic pointer for operations that do not need type information.*/
  92         void                   *ptr;
  93     }                           u;
  94     /*! \brief
  95      * Number of elements allocated for the value array.
  96      */
  97     int                         nalloc;
  98 } gmx_ana_selvalue_t;
  99
 100 /*! Initializes an empty selection value structure.*/
 101 extern void
 102 _gmx_selvalue_clear(gmx_ana_selvalue_t *val);
 103 /*! Reserve memory for storing selection values.*/
 104 extern int
 105 _gmx_selvalue_reserve(gmx_ana_selvalue_t *val, int n);
 106 /*! Sets the memory for storing selection values.*/
 107 extern int
 108 _gmx_selvalue_setstore(gmx_ana_selvalue_t *val, void *ptr);
 109 /*! Sets the memory for storing selection values and marks it for automatic freeing.*/
 110 extern int
 111 _gmx_selvalue_setstore_alloc(gmx_ana_selvalue_t *val, void *ptr, int nalloc);
 112
 113 #ifdef __cplusplus
 114 }
 115 #endif
 116
 117 #endif