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let foo = OptionalI32::AnI32(1);
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match foo {
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OptionalI32::AnI32(n) => println!("it’s an i32: {}", n),
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OptionalI32::Nothing => println!("it’s nothing!"),
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}
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// Advanced pattern matching
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struct FooBar { x: i32, y: OptionalI32 }
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let bar = FooBar { x: 15, y: OptionalI32::AnI32(32) };
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//
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match bar {
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FooBar { x: 0, y: OptionalI32::AnI32(0) } =>
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println!("The numbers are zero!"),
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FooBar { x: n, y: OptionalI32::AnI32(m) } if n == m =>
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println!("The numbers are the same"),
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FooBar { x: n, y: OptionalI32::AnI32(m) } =>
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println!("Different numbers: {} {}", n, m),
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FooBar { x: _, y: OptionalI32::Nothing } =>
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println!("The second number is Nothing!"),
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}
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