Subject: Re: [SG16-Unicode] std::byte based I/O library
From: Lyberta (lyberta_at_[hidden])
Date: 2019-02-07 05:41:00
> 1/ Text _is_ bytes. Unicode specifies BOM and little/big endian versions
> so I think prepending a bom ( should you want to ) and byte-swapping can be
> done along transcoding
Maybe separate BOM handling into a format state of the stream. Consider
enum class std::bom_handling
none, ///< Do not read or write BOM.
not_utf8, ///< Read and write BOM only in UTf-16 and UTF-32.
all ///< Read and write BOM in all 3 encoding forms.
This feels like a more elegant design because it separates concerns better.
> 3/ stream don't have an explicit encoding ( or locale, for that matter ),
> but they might expect one - think for example about writing to stdout.
stdout is a special case and we have a way to handle it - execution
character set. The only problem is that in order to go from Unicode to
ECS right now you'd need to use std::codecvt which is a horrible mess.
Still, there are some utilities that treat stdin/stdout as a stream of
raw bytes so it doesn't always represent a text stream.
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