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foreign function interface interface

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Alex Burka 2016-06-13 18:00:07 -04:00 • committed by Alex Burka
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@ -593,7 +593,7 @@ to represent a nullable function pointer using the C ABI (corresponding to the C
Here is a contrived example. Let's say some C library has a facility for registering a Here is a contrived example. Let's say some C library has a facility for registering a
callback, which gets called in certain situations. The callback is passed a function pointer callback, which gets called in certain situations. The callback is passed a function pointer
and an integer and it is supposed to run the function with the integer as a parameter. So and an integer and it is supposed to run the function with the integer as a parameter. So
we have function pointers flying across the FFI interface in both directions. we have function pointers flying across the FFI boundary in both directions.
```rust ```rust
use std::os::raw::c_int; use std::os::raw::c_int;