OMchanged

Synopsis

int OMchanged(OMobj_id  object_id, int  seq_num);

int OMXobj::changed(int  seq_num);

Description

OMchanged is normally called from a method's update function. It can be used to determine whether or not one of the parameters has changed since the last invocation of the method.

Arguments

object_id

The id of one of the parameters to the object.

seq_num

The sequence number of the method. This is passed as an argument to methods written with the omethod and cxxmethod method types.

Returned value

Returns a 1 if the parameter has changed. Returns a 0 value otherwise.

Example

Given this V code for a simple module

module my_module {
int my_param1;
omethod+notify+read update = "my_module_update";
};

this C code can determine whether my_param1 has changed since the module last ran:

int
my_module_update(OMobj_id obj_id, OMevent_mask mask,
int seq_num)
{
OMobj_id param_id;

param_id = OMfind_subobj(obj_id,
OMstr_to_name("my_param1"),
OM_OBJ_RD);
if (OMchanged(param_id, seq_num)) { /* param1 changed */
...
}
...