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proposal: Go 2: Permit running code at compile-time using "comptime" keyword #39216

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donutloop opened this issue May 22, 2020 · 4 comments
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proposal: Go 2: Permit running code at compile-time using "comptime" keyword #39216

donutloop opened this issue May 22, 2020 · 4 comments
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FrozenDueToAge LanguageChange Proposal Proposal-FinalCommentPeriod v2 A language change or incompatible library change
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@donutloop
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donutloop commented May 22, 2020 •
edited

Problem

I want to read in the content of files while compiling time to simplify the shipping of template files with a binary.

Solution

using the comptime keyword to run arbitrary code at compilation-time.

Ref: https://ziglang.org/documentation/master/#Introducing-the-Compile-Time-Concept

Design idea

func main() {
    content := comptime os.Open("./code.json")
   ....
}
@gopherbot gopherbot added this to the Proposal milestone May 22, 2020
@ianlancetaylor ianlancetaylor added v2 A language change or incompatible library change LanguageChange labels May 22, 2020
@ianlancetaylor
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We aren't going to permit arbitrary code to run at compile time.

The specific topic of embedding files in a compiled binary is #35950.

@beoran
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beoran commented May 23, 2020

Also there is go generate which should be used instead for code generation.

@ianlancetaylor
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For the reasons mentioned above, this is a likely decline. Leaving open for four weeks for final comments.

@griesemer griesemer changed the title proposal: Go 2: Comptime proposal: Go 2: Permit running code at compile-time using comptime keyword May 26, 2020
@griesemer griesemer changed the title proposal: Go 2: Permit running code at compile-time using comptime keyword proposal: Go 2: Permit running code at compile-time using comptime keyword May 26, 2020
@griesemer griesemer changed the title proposal: Go 2: Permit running code at compile-time using comptime keyword proposal: Go 2: Permit running code at compile-time using "comptime" keyword May 26, 2020
@griesemer griesemer mentioned this issue May 26, 2020
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@ianlancetaylor
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No further comments.

@marniks7 marniks7 mentioned this issue Oct 30, 2020
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FrozenDueToAge LanguageChange Proposal Proposal-FinalCommentPeriod v2 A language change or incompatible library change
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