Add an example to the FFI guide #19968
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| The `extern "C"` makes this function adhere to the C calling convention, as | ||
| discussed above in "[Foreign Calling | ||
| Conventions](guide-ffi.html#foreign-calling-conventions)". The `no_mangle` | ||
| attribute turns of Rust's name mangling, so that this function can be |
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| ``` | ||
| #[no_mangle] | ||
| pub extern "C" fn hello_rust() -> *const u8 { |
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I personally prefer to drop the "C" wherever possible as it's the default.
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Oh interesting. @aturon do we have any convention here?
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@aturon says no official one, but:
steve@warmachine:~/src/rust$ git grep 'extern {' | wc -l
253
steve@warmachine:~/src/rust$ git grep 'extern "C" {' | wc -l
25So, seems legit. :)
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@steveklabnik ping |
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This has now been updated to be on the book, and I fixed the style issue. @alexcrichton r? |
| } | ||
| ``` | ||
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| The `extern "C"` makes this function adhere to the C calling convention, as |
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@alexcrichton both nits fixed |
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Add an example to the FFI guide Reviewed-by: alexcrichton
bors
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bors
added a commit
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Jan 17, 2015
Add an example to the FFI guide Reviewed-by: alexcrichton
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Doing this manually as part of #21300 |
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This is a little short, but the FFI guide needs a cohesive go-over, and this at least adds the information in the meantime.
It also modernizes the style in a small way, by moving the tilde syntax to the grave syntax.