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Import Attribute ​

The @[Import] attribute links an extern declaration to a specific dynamic library (.dll, .so, .dylib). The operating system loader resolves the library by name at runtime.

rux
@[Import(lib: "libm.so")]
extern func cos(angle: float64) -> float64;

@[Import(lib: "libm.so")]
extern func sin(angle: float64) -> float64;

@[Import(lib: "libm.so")]
extern func sqrt(value: float64) -> float64;

Multiple declarations from the same library can be grouped in one extern block.

rux
@[Import(lib: "Kernel32.dll")]
extern {
    func CreateFileW(
        fileName: *const char16,
        desiredAccess: uint32,
        shareMode: uint32,
        securityAttributes: *SecurityAttributes,
        creationDisposition: uint32,
        flagsAndAttributes: uint32,
        templateFile: *opaque
    ) -> *opaque;

    func WriteFile(
        handle: *opaque,
        buffer: *const opaque,
        numberOfBytesToWrite: uint32,
        numberOfBytesWritten: *uint32,
        overlapped: *Overlapped,
    ) -> bool32;
}

See @[Import] for the full attribute reference.

See Also ​