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Add empty structs #2569

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Jan 22, 2025
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Add empty structs #2569

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10 changes: 6 additions & 4 deletions src/user-defined-types/tuple-structs.md
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minutes: 10
---

<!-- NOTES:
Tuple structs, newtype wrappers, unit-like structs, including initialization syntax
-->

# Tuple Structs

If the field names are unimportant, you can use a tuple struct:
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- Rust generally doesn’t like inexplicit things, like automatic unwrapping or
for instance using booleans as integers.
- Operator overloading is discussed on Day 3 (generics).
- When a tuple struct has zero fields, the `()` can be omitted. The result is a
zero-sized type (ZST), of which there is only one value (the name of the
type).
- This is common for types that implement some behavior but have no data
(imagine a `NullReader` that implements some reader behavior by always
returning EOF).
- The example is a subtle reference to the
[Mars Climate Orbiter](https://en.wikipedia.org/wiki/Mars_Climate_Orbiter)
failure.
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