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ant/examples/ffi/custom/mathlib.js
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mathlib.js
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			import { join } from 'ant:path';
			import { dlopen, suffix, FFIType } from 'ant:ffi';

			// compile the C library first:
			// clang -shared -fPIC -o mathlib.(so/dylib/dll) mathlib.c

			const mathlib = dlopen(join(import.meta.dirname, `mathlib.${suffix}`));

			mathlib.define('add', {
			args: [FFIType.int, FFIType.int],
			returns: FFIType.int
			});
			mathlib.define('multiply', {
			args: [FFIType.int, FFIType.int],
			returns: FFIType.int
			});
			mathlib.define('greet', {
			args: [FFIType.string],
			returns: FFIType.void
			});
			mathlib.define('divide', {
			args: [FFIType.double, FFIType.double],
			returns: FFIType.double
			});

			const result1 = mathlib.call('add', 5, 3);
			console.log(`add(5, 3) = ${result1}`);

			const result2 = mathlib.call('multiply', 4, 7);
			console.log(`multiply(4, 7) = ${result2}`);

			console.log('Calling greet function:');
			mathlib.call('greet', 'World');

			const result3 = mathlib.call('divide', 10.0, 2.0);
			console.log(`divide(10.0, 2.0) = ${result3}`);

			const result4 = mathlib.call('divide', 10.0, 0.0);
			console.log(`divide(10.0, 0.0) = ${result4}`);

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