This file is indexed.

/usr/include/ap_var.h is in libapron-dev 0.9.10-6.

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The actual contents of the file can be viewed below.

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/* ********************************************************************** */
/* ap_var.h: variables (strings or user-defined) */
/* ********************************************************************** */

/* This file is part of the APRON Library, released under LGPL license.  Please
   read the COPYING file packaged in the distribution */

#ifndef _AP_VAR_H_
#define _AP_VAR_H_

#ifdef __cplusplus
extern "C" {
#endif


/* ====================================================================== */
/* Datatype */
/* ====================================================================== */

/* The abstract type ap_var_t is
   equipped with a total ordering function, a copy function, 
   and a free function.

   The parametrization is done via a global variable pointing to an 
   ap_var_operations_t structure.
 */

typedef void* ap_var_t;

typedef struct ap_var_operations_t {
  int (*compare)(ap_var_t v1, ap_var_t v2); /* Total ordering function */
  int (*hash)(ap_var_t v);                  /* Hash function */
  ap_var_t (*copy)(ap_var_t var);           /* Duplication function */
  void (*free)(ap_var_t var);               /* Deallocation function */
  char* (*to_string)(ap_var_t var);         /* Conversion to a dynamically allocated string */
} ap_var_operations_t;

extern ap_var_operations_t ap_var_operations_default;
  /* default manager: ap_var_t are char* */

extern ap_var_operations_t* ap_var_operations;
/* points to manager in use, by default ap_var_operations_default */

#ifdef __cplusplus
}
#endif

#endif