55a3b3eb81
Only implements the different conversion types from and to ints for now.
Unfortunately very reliant on builtins.{floor,ceil} which can't be
implemented purely except very inefficiently (to my knowledge), so it
only really works for C++ Nix >= 2.4. Tests are thus skipped for
C++ Nix 2.3.
Change-Id: Idcb1a11df11e214cdba3f2a0715472b370daa7dc
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9008
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
23 lines
522 B
Nix
23 lines
522 B
Nix
{ depot, ... }:
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let
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inherit (depot.users.sterni.nix)
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num
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;
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in
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rec {
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# In C++ Nix, the required builtins have been added in version 2.4
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ceil = builtins.ceil or (throw "Nix implementation is missing builtins.ceil");
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floor = builtins.floor or (throw "Nix implementation is missing builtins.floor");
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truncate = f: if f >= 0 then floor f else ceil f;
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round = f:
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let
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s = num.sign f;
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a = s * f;
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in
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s * (if a >= floor a + 0.5 then ceil a else floor a);
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intToFloat = i: i * 1.0;
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}
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