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|    comp.lang.c++.moderated    |    Moderated discussion of C++ superhackery    |    33,346 messages    |
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|    Message 32,305 of 33,346    |
|    Kaba to Jeremy Todd    |
|    Re: taking abs() of min signed int value    |
|    17 May 12 06:45:44    |
      c21e7739       From: kaba@nowhere.com              Jeremy Todd wrote:       > I need to compute the absolute value of the minimum signed int value       > for each signed integral type. This value isn't representable as a       > signed int, but it is representable as an unsigned int.              A way out of these problems is to never use the smallest value of a       signed integer. For example, if you store a sound signal in a 16bit       signed integer, use the range [-(2^16 - 1), 2^16 - 1]. The non-existence       of the additive inverse of -2^n makes the value unusable. From this       restriction follows other advantages such as being able to form a       bijection between the integer values and floating point numbers (useful       for lossless sound conversion between integers and floating point       numbers). Similarly for any data which is quantized from real numbers.              --       http://kaba.hilvi.org                      [ See http://www.gotw.ca/resources/clcm.htm for info about ]        [ comp.lang.c++.moderated. First time posters: Do this! ]              --- SoupGate-Win32 v1.05        * Origin: you cannot sedate... all the things you hate (1:229/2)    |
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