__NAME__

        svalue - internal type for storing Pike values

__DESCRIPTION__

        The 'struct svalue' contains one Pike 'value', variables, arrays
        and the evaluator are all svalues. An svalue consists of three
        elements: type, subtype and a union containing the actual value.
        The type is a short which tells you what type the svalue is. The
        value is one of the following:

-     ~~T_ARRAY~~: When type is T_ARRAY, the array is stored in the 'array' member of the union. So if sval is the pointer to the svalue, you would use sval->u.array to access the actual array.
-  ~~T_MAPPING~~:      In this case, you use sval->u.mapping.

-        ~~T_MULTISET~~:      sval->u.multiset

-        ~~T_OBJECT~~:        sval->u.object

-        ~~T_FUNCTION~~:      Functions are a bit more difficult, sval->u.object is the object the function is in, and sval->subtype is the number of the function in that object.

-        ~~T_PROGRAM~~:       sval->u.program is the struct program you want.

-        ~~T_STRING~~:        sval->u.string

-        ~~T_FLOAT~~:         sval->u.float_number

-        ~~T_INT~~:           sval->u.integer, a special case is that sval->subtype is used in some cases to represent the value 'undefined'. This is what zero_type detects.

        There are lots of functions operating on svalues, so you shouldn't
        have to do all that much stuff with them yourself. However, for now
        you do need to check the type and extract the proper member of the
        union yourself when writing your own C functions for Pike.

__KEYWORDS__

        internals

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