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zig-comptime

Use when Zig code needs compile-time evaluation: comptime parameters, generic types, anytype, @typeInfo reflection, comptime tables, or a ported C++ template pattern. Not for C++: use cpp-templates.

.devin/skills/zig-comptime/SKILL.md

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Sep 28, 2026
License
Apache-2.0

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# Zig comptime

## Contract

| Field | Bound contract |
|---|---|
| Trigger | The user writes a generic Zig function or type, asks how `comptime` or `anytype` works, needs reflection over a type's fields, wants a table or string computed at compile time, or is porting template metaprogramming from C++. |
| Authority | Read-only. The skill emits Zig code and readings to chat; the user writes them. Rollback is not needed. No remote mutation. |
| Side effect | Chat output; scratch compiles in a scratch directory. |
| Done | The comptime construct for the request is reported and a scratch file using it compiles and runs on the installed Zig. |

## Inputs

- Zig version from `zig version`: required. Samples ran on Zig 0.14.1, where `@typeInfo` tags are lowercase (`.int`, `.@"struct"`); older releases used capitalized tags.