mirror of
https://github.com/fluffos/fluffos
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1ad5953549
* empty
* docs: validate "See Also" references, drop dead ones, document valid_ffi
Reviewed the "See Also" section of every doc and dropped man-page
cross-references whose target page does not exist (verified against the
driver source, not just the docs tree):
- errorp, each, opcprof, dump_socket_status, extract, shadowp,
destruct_env_of, move, inventory_visible, inventory_accessible
These name efuns/applies that no longer exist in FluffOS. keys/values now
point at the `for` construct in place of the defunct `each` efun.
valid_ffi was the one "referenced but undocumented" case: it is a real
master apply (APPLY_VALID_FFI) gating every ffi_load/symbol/prepare/
callback, so it gets a proper apply page rather than having its references
removed. Sidebar regenerated to include it.
The 13 modern markdown-link "See Also" sections were already clean.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---------
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
58 lines
1.7 KiB
Markdown
58 lines
1.7 KiB
Markdown
---
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title: functions / functionp
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---
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# functionp
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### NAME
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functionp() - determine whether or not a given variable is a function
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pointer, and if so what kind
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### SYNOPSIS
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int functionp( mixed arg );
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### DESCRIPTION
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Return nonzero if 'arg' is a function pointer and zero (0) otherwise.
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Function pointers are variables of type 'function' as indicated in the
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documentation for the type 'function', for example:
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f = (: obj, func :);
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The return value indicates the type of function pointer using the val‐
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ues given in the driver include file "include/function.h".
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function pointer type value
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--------------------- -----
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call_other FP_CALL_OTHER
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lfun FP_LOCAL
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efun FP_EFUN
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simul_efun FP_SIMUL
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functional FP_FUNCTIONAL
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In addition, the following values will be added in some cases:
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FP_HAS_ARGUMENTS arguments provided
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FP_OWNER_DESTED creator has been dested
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FP_NOT_BINDABLE not rebindable)
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The last set of values are bit values and can be tested with bit opera‐
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tions. The value FP_MASK is provided for ignoring the bit values and
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testing the basic type of the function pointer.
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Examples:
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To test if a function variable is an efun pointer:
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if ((functionp(f) & FP_MASK) == FP_EFUN) ...
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to test if it has args:
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if (functionp(f) & FP_HAS_ARGUMENTS) ...
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### SEE ALSO
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mapp(3), stringp(3), pointerp(3), objectp(3), intp(3), bufferp(3),
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floatp(3), nullp(3), undefinedp(3), bind(3), lpc/types/func‐
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tion
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