objc-sys 0.3.5

Raw bindings to the Objective-C runtime and ABI
Documentation 
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// Don't include any headers, cross compilation is difficult to set up
// properly in such situations.

/// We're linking to `libobjc` in build.rs, so this should be available.
///
/// See <https://clang.llvm.org/docs/AutomaticReferenceCounting.html#arc-runtime-objc-retain>.
id objc_retain(id value);

/// Unsure how C name resolution works, so we make sure to version this symbol.
///
/// Return `unsigned char` since it is guaranteed to be `u8` on all platforms.
unsigned char rust_objc_sys_0_3_try_catch_exception(void (*f)(void *), void *context, id *error) {
    @try {
        f(context);
        return 0;
    } @catch (id exception) {
        // The exception is retained while inside the `@catch` block, but is
        // not guaranteed to be so outside of it; so hence we must do it here!
        *error = objc_retain(exception);
        return 1;
    }
}