set_method_table

set_method_table sets the methods (member functions) for the given object.

obj = set_method_table(obj, ssClass)
obj = set_method_table(obj, ssClass, bUpdate)

Return Value

obj is a pointer for the first parameter or 0, if an error occurred.

Parameters

obj

obj is the object created with obj_create.

ssClass

To set the method table, a function with the name ssClass + “_methods” will be invoked. This function must set the methods, see comment.

bUpdate

If the bUpdate parameter is TRUE (1), the function ssClass + "_method" will be invoked and the method table will be copied to _g()._method_table. The method table will be assigned to obj by calling obj_set_methods.

If the bUpdate parameter is FALSE (0), only the current _g()._method_table will be assigned to the obj object.

If the bUpdate is not specified, the value set in _g()._debug will be used for bUpdate. The first call after F4 (save/execute) _g()._debug is set to 1.

Comment

To create a method table, you must specify global functions witch can be added to the table. The first parameter of the function must be the object itself:

def my_obj_print(this)
{
   // ...
}

methodTable = [.
   print = "my_obj_print"
];

methodTable is the method table.

The set_method_table function expects a function with the name ssClass + “_methods” to exist. This function must return an object with a method table:

def my_methods()
{
    return [.
        print = "my_obj_print"
    ];
}

o = [. a = 1, b = 2];
set_method_table(o, "my")

The method table will be copied into the global variable _g()._method_table.my (see _g) and the pointer will be saved with obj_set_methods in the object o. With o.methods (see obj_methods) the method can be retrieved.

Example

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def my_obj_print(this)
{
    k = this.keys
    for (i in 1:len(k)) {
        printf("%s = ", k[i]);
        print this[k[i]]
    }
}
def my_methods()
{
    return [.
        print = "my_obj_print",
        __print__ = "my_obj_print"];
}
def my_create()
{
    this = [.];
    set_method_table(this, "my");
    return this;
}
o = my_create();
o.a = 1;
o.b = 2;

o
print o
o.print()

History

Version Description
R2013.2 Default parameter bUpdate modified (see above) and documentation modified.
4.1.1 New.

See also

Overview UniScript Objects, obj_set_methods, obj_methods, obj_set_parent, obj_parent

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