66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
#ifndef OPTION_H
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#define OPTION_H
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#include "concatenate.h"
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#include "varargcount.h"
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#include <stdbool.h>
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/* usage example:
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*
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* struct result {
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* float f;
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* m_option_list(
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* int, v
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* )
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* }
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*
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* struct result = {
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* m_set(f, 1.0), -- non options could be set with this
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* m_opt(v, 5), -- options are supposed to be initialized like that
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* }
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*
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*/
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#define m_set(p_member, p_value) .p_member = (p_value)
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#define m_opt(p_member, p_value) .p_member##_opt = (p_value), .p_member##_opt_set = 1
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#define m_is_set(p_value, p_member) ((p_value).p_member##_opt_set)
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/* warn: beware of double evaluation! */
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#define m_or(p_value, p_member, p_default) ((p_value).p_member##_opt_set ? (p_value).p_member##_opt : (p_default))
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#define m_option_list_2(t0, m0) \
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t0 m0##_opt; \
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bool m0##_opt_set : 1; \
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#define m_option_list_4(t0, m0, t1, m1) \
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t0 m0##_opt; \
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t1 m1##_opt; \
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bool m0##_opt_set : 1; \
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bool m1##_opt_set : 1; \
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#define m_option_list_6(t0, m0, t1, m1, t2, m2) \
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t0 m0##_opt; \
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t1 m1##_opt; \
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t2 m1##_opt; \
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bool m0##_opt_set : 1; \
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bool m1##_opt_set : 1; \
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bool m2##_opt_set : 1; \
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#define m_option_list_8(t0, m0, t1, m1, t2, m2, t3, m3) \
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t0 m0##_opt; \
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t1 m1##_opt; \
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t2 m2##_opt; \
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t3 m3##_opt; \
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bool m0##_opt_set : 1; \
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bool m1##_opt_set : 1; \
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bool m2##_opt_set : 1; \
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bool m3##_opt_set : 1; \
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#define m_option_list_(p_n, ...) m_concatenate(m_option_list_, p_n)(__VA_ARGS__)
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#define m_option_list(...) m_option_list_(m_narg(__VA_ARGS__), __VA_ARGS__)
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#endif
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