2.6.1 Defining Prefix Unary Operators

The expression evaluator is introduced the prefix unary operators set via an array of pointers to struct x1f4_operator_type records, of which the last is null.

See struct x1f4_operator_type.

Setting up the expression parser becomes:

    struct x1f4_attributes_type attributes;

    ...

    attributes.operator1s = <operator definition pointers array>;

    ...

    status = x1f4_init_expression(..., ..., ..., &attributes);

See struct x1f4_attributes_type.

Operator definitions may be used up to parsed expression destruction, thus the prefix unary operator definition references and the array listing them must be valid for as long as the result of expression parsing is used.