Re^4: How to reverse a (Unicode) string

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Re^5: How to reverse a (Unicode) string by JavaFan (Canon) on Jan 10, 2011 at 09:17 UTC
You seem to be confusing "1-to-1" mapping, and "identity function". While the identity function is a trivial "1-to-1" mapping, it's not true every "1-to-1" mapping is the identity function. However, even side-stepping that, Juerd doesn't mean byte values map 1-to-1. The mapping is after decoding. For instance, the UTF-8 byte sequence 0x82 0xC3 decodes to C2. Which indeed does map to the C2 Unicode code point.	[reply]
Re^6: How to reverse a (Unicode) string by ikegami (Patriarch) on Jan 10, 2011 at 15:50 UTC
In that case, we're back to the original question. Are there any encodings aren't "Unicode encodings"? (Strictly speaking, the mapping isn't 1-to-1. U+2660 can't be encoded in iso-8859-1. You could also say that both U+00E9 and U+0065 U+0301 encode to E9 in iso-8859-1, although Encode's `encode` doesn't handle that.)	[reply] [d/l]
Re^7: How to reverse a (Unicode) string by JavaFan (Canon) on Jan 10, 2011 at 16:17 UTC
Strictly speaking, the mapping isn't 1-to-1. U+2660 can't be encoded in iso-8859-1 The claim is that iso-8859-1 maps 1-to-1 to Unicode, not that Unicode maps 1-to-1 to iso-8859-1. A 1-to-1 mapping is also known as an injection. The claim wasn't that it's a bijection (aka 1-to-1 correspondence).	[reply]
Re^6: How to reverse a (Unicode) string by ikegami (Patriarch) on Jan 10, 2011 at 16:15 UTC
No, actually, I'm not confused. When the term was introduced, it was given as the reason iso-8859-1 works without being decoded, so he indeed meant an identity mapping.	[reply]
Re^7: How to reverse a (Unicode) string by JavaFan (Canon) on Jan 10, 2011 at 16:29 UTC
You have to always decode. Note that Unicode is a list of integers with a meaning. iso-8859-1 is an encoding (of a subset of Unicode). UTF-8 is also an encoding. UTF-16 is another. It just happens that for the first 128 code points, the encoding in iso-8859-1 and UTF-8 are identical. But that wasn't part of Juerds claim.	[reply]
Re^8: How to reverse a (Unicode) string by ikegami (Patriarch) on Jan 10, 2011 at 16:38 UTC
Re^9: How to reverse a (Unicode) string by JavaFan (Canon) on Jan 10, 2011 at 16:48 UTC
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