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Re: [Qemu-devel] [PATCH 4/7] qapi: String visitor, use %f represenation


From: Andreas Färber
Subject: Re: [Qemu-devel] [PATCH 4/7] qapi: String visitor, use %f represenation for floats
Date: Sat, 28 Apr 2012 18:20:47 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:11.0) Gecko/20120328 Thunderbird/11.0.1

Am 27.04.2012 22:21, schrieb Michael Roth:
> Currently string-output-visitor formats floats as %g, which is nice in
> that trailing 0's are automatically truncated, but otherwise this causes
> some issues:
> 
>  - it 6 uses significant figures instead of 6 decimal places, which

"it uses 6 significant"

>    means something like 155777.5 (which even has an exact floating point
>    representation) will be rounded to 155778 when converted to a string.
> 
>  - output will be presented in scientific notation when the normalized
>    form requires a 10^x multiplier. Not a huge deal, but arguably less
>    readable for command-line arguments.
> 
>  - due to using sig figs instead of hard-defined decimal places, it

"six figs"?

>    fails a lot of the test-visitor-serialization unit tests for floats.
> 
> Instead, let's just use %f, which is what the QJSON and the QMP visitors
> use.
> 
> Signed-off-by: Michael Roth <address@hidden>

/-F

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