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Constrained genericity: Difference between revisions
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→{{header|Rust}}
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Line 1,263:
// This declares the generic "FoodBox" type,
// whose parameter must satisfy the "Eatable" constraint.
// The objects of this type contain a vector of eatable objects.
struct FoodBox<T: Eatable> {
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}
// This implements the functions associated
//
// to declare a handy "new" constructor.
impl<T: Eatable> FoodBox<T> {
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}
// This makes also the primitive "char" type satisfy the "Eatable" constraint.
impl Eatable for char {
fn eat() {}
Line 1,299:
// This instantiate a "FoodBox" parameterized by the "char" type.
// It is allowed, as "char" implements "Eatable".
let _fb2 = FoodBox::<char>::new();
// This instantiate a "FoodBox" parameterized by the "bool" type.
// It is NOT allowed, as "bool" does not implement "Eatable".
//let _fb3 = FoodBox::<bool>::new();
}
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