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arg-type = set;
The argument must be a list of names each of which must match the strings
"all
", "none
" or one of the keywords (see section Keyword list)
specified for this option. all
will turn on all membership bits and
none
will turn them all off. Specifying one of the keywords will turn
on the corresponding set membership bit. Literal numbers may also be used and
may, thereby, set or clear more than one bit. Preceding a keyword or literal
number with a bang (!
- exclamation point) will turn the bit(s) off.
The number of keywords allowed is constrained by the number of bits in a
pointer, as the bit set is kept in a void*
.
If, for example, you specified first
in your list of keywords,
then you can use the following code to test to see if either first
or all
was specified:
uintptr_t opt = OPT_VALUE_OPTN_NAME; if (opt & OPTN_NAME_FIRST) /* OPTN_NAME_FIRST bit was set */ ; |
AutoOpts produces a special purpose procedure for this option.
To set multiple bits as the default (initial) value, you must
specify an initial numeric value (which might become inaccurate over
time), or else specify arg-default
multiple times. Do not
specify a series of names conjoined with +
symbols as the
value for any of the arg-default
attributes. That works for
option parsing, but not for the option code generation.
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This document was generated by Bruce Korb on February 17, 2011 using texi2html 1.82.