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태그: ffi

FFI(Foreign Function Interface)는 한 프로그래밍 언어에서 다른 프로그래밍 언어의 코드를 호출하기 위한 인터페이스를 말한다. Rust에서는 toml에 lib 형태로 저장한 crate방식으로 사용할 수 있다. Rust에서 C 코드 호출하기 snappy라는 C 라이브러리를 참조하는 코드 예시를 살펴보자. use libc::size_t; [link(name = "snappy")]extern { fn snappy_max_compressed_length(source_length: size_t) -> size_t; fn snappy_compress(input: *const u8, input_length: size_t,

Using extern keyword, you can link to or import external code. The extern keyword is used in two places in Rust. One is in conjunction with the crate keyword to make your Rust code aware of other Rust crates in your project, i.e., extern crate lazy_static;. The other use is in foreign function interfaces (FFI). extern is used in two different contexts within FFI. The first is in the form of

repr(Rust) First and foremost, all types have an alignment specified in bytes. A value with alignment n must only be stored at an address that is a multiple of n. So alignment 2 means you must be stored at an even address, and 1 means that you can be stored anywhere. Alignment is at least 1, and always a power of 2. Primitives are usually aligned to their size, although this is platform-sp