Lib.rs

Utility library to work with tuples.

Features:

• Test if all elements are Ok: all_ok()

  assert_eq!(
      all_ok((good(1), good(2), good(3))),
      Ok((1, 2, 3)),
  );
  assert_eq!(
      all_ok((good(1), bad(2), good(3))),
      Err((Ok(1), Err(2), Ok(3)))
  );
  

• Test if all elements are Some: all_some()

  assert_eq!(
      all_some((Some(1), Some(2), Some(3))),
      Ok((1, 2, 3))
  );
  assert_eq!(
      all_some((Some(1), Option::<()>::None, Some(3))),
      Err((Some(1), None, Some(3)))
  );
  

• Prepend an element to a tuple: prepend()

  assert_eq!(
      prepend(1, (2, 3, 4)),
      (1, 2, 3, 4)
  );
  

• Append an element to a tuple: append()

  assert_eq!(
      append((1, 2, 3), 4),
      (1, 2, 3, 4)
  );
  

• Concatenate two tuples: concat_tuples()

  assert_eq!(
      concat_tuples((1, 2), (3, 4, 5)),
      (1, 2, 3, 4, 5)
  );
  

• Concatenate multiple tuples: concat_many()

  assert_eq!(
      concat_many(((), (1,), (2, 3,), (4, 5, 6))),
      (1, 2, 3, 4, 5, 6)
  );
  

• Turn a reference to a tuple to a tuple of references: ref_tuple()

  assert_eq!(
      ref_tuple(&(1, 2, 3)),
      (&1, &2, &3)
  );
  

• Turn a reference to a mutable tuple to a tuple of mutable references: tuple_ref_mut()

  assert_eq!(
      tuple_ref_mut(&mut (1, 2, 3)),
      (&mut 1, &mut 2, &mut 3)
  );
  

• Extract the first element of a tuple: unprepend()

  assert_eq!(
      unprepend((1, 2, 3, 4)),
      (1, (2, 3, 4))
  );
  

• Extract the last element of a tuple: unappend()

  assert_eq!(
      unappend((1, 2, 3, 4)),
      ((1, 2, 3), 4)
  );
  

• Call a function with the tuple members as arguments: apply()

  fn add3(a: u32, b: u32, c: u32) -> u32 { a + b + c }
  
  let tpl3 = (1, 2, 3);
  assert_eq!(
      apply(&add3, tpl3),
      6
  );
  

• Element-wise wrap the element of a tuple in Option: option_tuple()

  assert_eq!(
      option_tuple(Some((1, 2, 3))),
      (Some(1), Some(2), Some(3))
  );
  

• Get the length of a tuple: length()

  assert_eq!(<(u8, u16, u32) as TupleLength>::LENGTH, 3);
  

• Map a tuple: map_tuple()

  struct MyTupleEnum(usize);
  
  impl TupleMapper for MyTupleEnum {
      type MapElem<Type> = (usize, Type);
  
      fn map_elem<Elem>(&mut self, elem: Elem) -> Self::MapElem<Elem> {
          let index = self.0;
          self.0 += 1;
          (index, elem)
      }
  }
  
  assert_eq!(
      map_tuple(MyTupleEnum(1), ("hello", "world", "!")),
      ((1, "hello"), (2, "world"), (3, "!")),
  )
  

Supported tuple lengths:

By default the selected operations are implemented to tuples upto a length of 16 elements (features = ["default-len"]).

You can specify a higher limit by using feature = ["X"], where X can be 8, 16, 32, 64, 96, 128, 160, 192, 224, or 256. A higher number includes all lower numbers.