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## global.c -- global variables and their functions

> Qhull uses a global data structure, `qh`, to store globally defined constants, lists, sets, and variables. This allows multiple instances of Qhull to execute at the same time. The structure may be statically allocated or dynamically allocated with malloc(). See QHpointer.

Copyright © 1995-2019 C.B. Barber

» Geom • Global • Io • Mem • Merge • Poly • Qhull • Set • Stat • User

### Index to global.c and libqhull.h

- Qhull's global variables
- Global variable and initialization routines

### »Qhull's global variables

- qh_version version string
- qh all global variables for qhull are in `qh,qhmem`, and `qhstat`
- QHULL_LIB_CHECK Check for compatible library
- qh constants configuration flags and constants for Qhull
- qh precision constants precision constants for Qhull
- qh internal constants internal constants for Qhull
- qh facet and vertex lists lists of facets and vertices
- qh global variables minimum and maximum distances, next visit ids, several flags, and other global variables.
- qh global sets global sets for merging, hashing, input, etc.
- qh global buffers buffers for matrix operations and input
- qh static variables static variables for individual functions

### »Global variable and initialization routines

- qh_appendprint append output format to `qh.PRINTout`
- qh_checkflags check flags for multiple frontends to qhull
- qh_clear_outputflags clear output flags for QhullPoints
- qh_freebuffers free global memory buffers
- qh_freebuild free memory used by qh_initbuild and qh_buildhull
- qh_freeqhull free memory used by qhull
- qh_init_A called before error handling initialized
- qh_init_B called after points are defined
- qh_init_qhull_command build `qh.qhull_command` from `argc/argv`
- qh_initflags set flags and constants from command line
- qh_initqhull_buffers initialize global memory buffers
- qh_initqhull_globals initialize global variables
- qh_initqhull_mem initialize Qhull memory management
- qh_initqhull_outputflags initialize flags concerned with output
- qh_initqhull_start allocate qh_qh and call qh_initqhull_start2()
- qh_initqhull_start2 initialize default values at Qhull startup
- qh_initthresholds initialize 'Pdn' and 'PDn' thresholds
- qh_lib_check check for compatible Qhull library. Invoked by QHULL_LIB_CHECK at start of each program.
- qh_option append option description to `qh.global_options`
- qh_restore_qhull restores a previously saved qhull
- qh_save_qhull saves qhull for a later qh_restore_qhull()
- qh_strtol duplicates strtod() and strtol()

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Comments to: qhull@qhull.org
Created: May 2, 1997 --- Last modified: see top