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generics/impl.md: follow rustfmt style #1236

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Aug 6, 2019
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generics/impl.md: follow rustfmt style #1236

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22 changes: 13 additions & 9 deletions src/generics/impl.md
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Original file line number Diff line number Diff line change
Expand Up @@ -4,39 +4,43 @@ Similar to functions, implementations require care to remain generic.

```rust
struct S; // Concrete type `S`
struct GenericVal<T>(T,); // Generic type `GenericVal`
struct GenericVal<T>(T); // Generic type `GenericVal`

// impl of GenericVal where we explicitly specify type parameters:
impl GenericVal<f32> {} // Specify `f32`
impl GenericVal<S> {} // Specify `S` as defined above

// `<T>` Must precede the type to remain generic
impl <T> GenericVal<T> {}
impl<T> GenericVal<T> {}
```

```rust,editable
struct Val {
val: f64
val: f64,
}

struct GenVal<T>{
gen_val: T
struct GenVal<T> {
gen_val: T,
}

// impl of Val
impl Val {
fn value(&self) -> &f64 { &self.val }
fn value(&self) -> &f64 {
&self.val
}
}

// impl of GenVal for a generic type `T`
impl <T> GenVal<T> {
fn value(&self) -> &T { &self.gen_val }
impl<T> GenVal<T> {
fn value(&self) -> &T {
&self.gen_val
}
}

fn main() {
let x = Val { val: 3.0 };
let y = GenVal { gen_val: 3i32 };

println!("{}, {}", x.value(), y.value());
}
```
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