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All these message functions use printf formatting.

int gl_output(char *msg, ...) 
Send a message to the normal output stream.
int gl_warning(char *msg, ...) 
Send a message to the warning output stream.
int gl_error(char *msg, ...) 
Send a message to the error output stream.
int gl_debug(char *msg, ...) 
Send a message to the debug output stream.
int gl_verbose(char *msg, ...) 
Send a message to the verbose output stream.
int gl_testmsg(char *msg, ...) 
Send a message to the test output stream.

Property formatting

char *gl_name(object obj) 
Construct a string containing a name for the object.
char *gl_strftime(timestamp ts) 
Convert a timestamp to a string using a static buffer.

Property access

char *gl_global_getvar(char *name) 
Get the string value of a global variable.
gl_get_value(object obj, char *name, T &value) 
Get the value of a property of type T.
void *gl_get_addr(object obj, char *name) 
Get a pointer to the property of an object.
FUNCTIONADDR gl_get_function(CLASS *oclass, char *fname) 
Get a pointer to a class function.
int gl_set_parent(OBJECT *obj, OBJECT *parent) 
Set the parent of an object.

Exception handling

void gl_throw(char *msg, ...) 
Throw an exception with a printf style message (which stops the simulation)

Random numbers

gl_random_D(double a, ...) 
Get a random number of distribution D.


timestamp gl_globalclock 
Get the value of the simulation's global clock.
DATETIME *gl_localtime(timestamp ts, DATETIME *dt) 
Convert a timestamp to date/time structure.
timestamp gl_timestamp(double t) 
Convert a double (in seconds from 1/1/1970) to a timestamp.
double gl_seconds(timestamp ts) 
Convert a timestamp into seconds (from 1/1/1970).
double gl_minutes(timestamp ts) 
Convert a timestamp into minutes (from 1/1/1970).
double gl_hours(timestamp ts) 
Convert a timestamp into hours (from 1/1/1970).
double gl_days(timestamp ts) 
Convert a timestamp into days (from 1/1/1970).
double gl_weeks(timestamp ts) 
Convert a timestamp into weeks (from 1/1/1970).



typedef struct {
        char name[1024];        // name of module
        CLASS *oclass;          // list of classes implemented by module
        unsigned short major;   // major version number
        unsigned short minor;   // minor version number
        PROPERTY *globals;      // list of globals used by module


typedef struct {
        char name[64];  // class name
        MODULE *module; // module that implement the class
        PROPERTY *pmap; // list of properties
        FUNCTION *fmap; // list of functions
        CLASS *parent;  // class parent
        CLASS *next;    // next class in list


typedef struct {
        unsigned int id;        // id (unique)
        CLASS *oclass;  // class
        object next;    // next object in list
        object parent;  // parent
        unsigned int rank;      // rank
        timestamp clock;        // clock
        double latitude, longitude; // geocoordinates
        timestamp in_svc, out_svc;      // service times
        char *name; // name of object


typedef struct {
        char name[64];  // name
        long ptype;     // type (see PT_* enum, e.g., PT_bool)
        unsigned long size;     // array size
        long access;    // access flags (see PA_* enum, e.g., PA_PUBLIC)
        UNIT *unit;     // units if any, or NULL
        void *addr;     // property location (header offset for objects, address for globals) */
        KEYWORD *keywords;      // list of valid keywords
        struct s_property_map *next;    // next property in property list 
        PROPERTYFLAGS flags;    // property flags (e.g., PF_RECALC) 


This structure defines a function published by a class.

typedef struct {
        char name[64];  // name of function
        int64 (*addr)(void*, ...);      // entry of function
        FUNCTION *next; // next function in list 


typedef struct {
        char name[64];  // name of unit
        double c,e,h,k,m,s,a,b; // unit parameters
        int prec;       // precision of unit
        struct s_unit *next;    // the next unit is the unit list