commit | f5718fa9bd681fd572b895fc09de472d0415deaf | [log] [tgz] |
---|---|---|
author | Stephen Crane <cranes@google.com> | Mon Jul 19 20:10:22 2021 +0000 |
committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | Mon Jul 19 20:10:22 2021 +0000 |
tree | 64fd2f6a3c8aae72991c398bbb95e5cab98fb95c | |
parent | b96e072ef8542eab69dfe5191391889a05fe71b7 [diff] | |
parent | f68b60ff737d800e965b3b8d1cbfde43a95ee890 [diff] |
Make std dependency injection conditional am: 3ab505921e am: f68b60ff73 Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/cfg-if/+/1759001 Change-Id: I3ed3ece1e751b6faa2617fca3a1699a0b694b2e4
A macro to ergonomically define an item depending on a large number of #[cfg] parameters. Structured like an if-else chain, the first matching branch is the item that gets emitted.
[dependencies] cfg-if = "0.1"
cfg_if::cfg_if! { if #[cfg(unix)] { fn foo() { /* unix specific functionality */ } } else if #[cfg(target_pointer_width = "32")] { fn foo() { /* non-unix, 32-bit functionality */ } } else { fn foo() { /* fallback implementation */ } } } fn main() { foo(); }
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