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                # 固有功能 > [intrinsics.md](https://github.com/rust-lang/rust/blob/master/src/doc/book/intrinsics.md) commit 024aa9a345e92aa1926517c4d9b16bd83e74c10d > **注意**:固有功能將會永遠是一個不穩定的接口,推薦使用穩定的 libcore 接口而不是直接使用編譯器自帶的功能。 可以像 FFI 函數那樣導入它們,使用特殊的`rust-intrinsic`ABI。例如,如果在一個獨立的上下文,但是想要能在類型間`transmute`,并想進行高效的指針計算,你可以聲明函數: ~~~ #![feature(intrinsics)] # fn main() {} extern "rust-intrinsic" { fn transmute<T, U>(x: T) -> U; fn offset<T>(dst: *const T, offset: isize) -> *const T; } ~~~ 跟其它 FFI 函數一樣,它們總是`unsafe`的。
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