>11 Digit Boy asked:
>> Why does Unicode only have space for 1114112 glyphs?
>
>BMP = 256 × 256 = 65536
>HI_SURROGS = 1024
>LO_SURROGS = 1024
>
>UNICODE = BMP + HI_SURROGS × LO_SURROGS = 1114112
There are other ways to calculate:
17 * 65536 = 1,114,112
0x10FFFF + 1 = 1,114,112 (decimal)
But we really should do a little extra arithmatic to arrive at a more
useful number:
65,536
* 17
-----------
1,114,112
- 2,048 (non-characters for surrogate code units)
- 34 (non-characters nFFFE and nFFFF for 0 <= n <= 16)
- 32 (non-characters FDD0 - FDEF)
-----------
1,111,998
That's the currently number of usable codepoints in the Unicode codespace.
- Peter
---------------------------------------------------------------------------
Peter Constable
Non-Roman Script Initiative, SIL International
7500 W. Camp Wisdom Rd., Dallas, TX 75236, USA
Tel: +1 972 708 7485
E-mail: <peter_constable@sil.org>
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