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Mention the bridges builder in the book #1319

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Mention the bridges builder in the book #1319

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12 changes: 12 additions & 0 deletions book/src/extern-c++.md
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Expand Up @@ -220,6 +220,18 @@ pub mod ffi {
}
```

If there are multiple bridge blocks within a crate, you need to include them in `build.rs` with a `bridges` builder

```rust,noplayground
// build.rs
fn main() {
cxx_build::bridges(["src/file1.rs", "src/file2.rs", ...])
.file("src/file1.cc")
.file("src/file2.cc")
...
}
```

#### Integrating with bindgen-generated or handwritten unsafe bindings

Handwritten `ExternType` impls make it possible to plug in a data structure
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