63 lines
1.9 KiB
Rust
63 lines
1.9 KiB
Rust
// https://doc.rust-lang.org/rust-by-example/primitives/tuples.html
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// Tuples can be used as function arguments and as return values
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fn reverse(pair: (i32, bool)) -> (bool, i32) {
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// `let` can be used to bind the members of a tuple to variables
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let (integer, boolean) = pair;
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(boolean, integer)
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}
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// The following struct is for the activity.
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#[derive(Debug)]
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struct Matrix(f32, f32, f32, f32);
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fn main() {
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// ---------- //
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// A tuple with a bunch of different types
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let long_tuple = (1u8, 2u16, 3u32, 4u64,
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-1i8, -2i16, -3i32, -4i64,
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0.1f32, 0.2f64,
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'a', true);
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// Values can be extracted from the tuple using tuple indexing
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println!("long tuple first value: {}", long_tuple.0);
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println!("long tuple second value: {}", long_tuple.1);
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// ---------- //
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// Tuples can be tuple members
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let tuple_of_tuples = ((1u8, 2u16, 2u32), (4u64, -1i8), -2i16);
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// Tuples are printable
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println!("tuple of tuples: {:?}", tuple_of_tuples);
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// But long Tuples cannot be printed
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// let too_long_tuple = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13);
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// println!("too long tuple: {:?}", too_long_tuple);
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// TODO ^ Uncomment the above 2 lines to see the compiler error
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let pair = (1, true);
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println!("pair is {:?}", pair);
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println!("the reversed pair is {:?}", reverse(pair));
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// To create one element tuples, the comma is required to tell them apart
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// from a literal surrounded by parentheses
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println!("one element tuple: {:?}", (5u32,));
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println!("just an integer: {:?}", (5u32));
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//tuples can be destructured to create bindings
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let tuple = (1, "hello", 4.5, true);
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let (a, b, c, d) = tuple;
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println!("{:?}, {:?}, {:?}, {:?}", a, b, c, d);
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let matrix = Matrix(1.1, 1.2, 2.1, 2.2);
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println!("{:?}", matrix);
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}
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