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static[T] and varargs together #1083

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PavelVozenilek opened this issue Apr 11, 2014 · 7 comments
Open

static[T] and varargs together #1083

PavelVozenilek opened this issue Apr 11, 2014 · 7 comments
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@zah
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Feature Static[T]

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@PavelVozenilek
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The documentation does not say how to combine static[T] feature with varargs parameter.
@zah zah self-assigned this Apr 12, 2014
@reactormonk
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Can you give an example where you would like to combine them?

@PavelVozenilek
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Graphic pipeline which takes a set of transformation matrices. If you know them all in advance you can avoid runtime calculation of result matrix.

Possibly a database transaction executing several SQL commands. If you know all of these commands in advance you may check their validity against the database during compile time.

Mixing of compile time and runtime parameters looks like a problem:

var s : string = ...

proc foo(static varargs[string]) = ...

foo("aaa", s, "bbb")

@Varriount
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Wouldn't a template work in this case?

@Araq Araq added the feature label Apr 13, 2014
@PavelVozenilek
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Wouldn't a template work in this case?

I do not know. This advanced part of the language is underdocumented, I didn't play with it yet.

@zah
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zah commented Apr 13, 2014

The correct syntax would be

proc foo(args: varargs[static[string]]) = ...

... but the combination is not supported yet.

@tobim
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tobim commented Dec 19, 2014

I would like to have support for that. I hope it will also work with macros.

@Araq Araq added the Static[T] label Apr 4, 2016
@shirleyquirk
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this would be handy for making a proc/template for strformat to concat staticly known substrings.
it's not trivial? / impossible to detect staticness inside a macro

Clyybber pushed a commit to Clyybber/Nim that referenced this issue Feb 24, 2024
@zerbina
testament: support \0 byte in output comparison (nim-lang#1083)
bcedd54 
## Summary

Neither the program output nor the comparison string are cut off at the
first null byte anymore.

## Details

Output comparisons in testament used `strutils.contains`, which uses
`strutils.find`, which, by default, uses `c_strstr`.

`c_strstr` operates on null-terminated strings, and thus stopped at the
first occurrence of one, even if the end of the NimSkull string hasn't
been reached yet.

Testament now uses a custom `contains` implementation based on C's
`memcmp`, so that the `\0` byte doesn't terminate the search.
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@reactormonk @zah @Araq @Varriount @tobim @PavelVozenilek @shirleyquirk