Crate cfg_if_edc
source ·Expand description
A macro for defining #[cfg]
if-else statements.
The macro provided by this crate, cfg_if
, is similar to the if/elif
C
preprocessor macro by allowing definition of a cascade of #[cfg]
cases,
emitting the implementation which matches first.
This allows you to conveniently provide a long list #[cfg]
’d blocks of code
without having to rewrite each clause multiple times.
§Example
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 */ }
}
}
Macros§
- The main macro provided by this crate. See crate documentation for more information.