go-generics/codes/type_sets.go

package main

// TYPE OMIT
type Integer interface {
	int
}

// TYPE OMIT

// INVALID OMIT
// EmbeddedParameter is INVALID.
type EmbeddedParameter[T any] interface {
	T // INVALID: may not list a plain type parameter
}
// INVALID OMIT


// APPRO OMIT
type MyInt int 

type AnyInteger interface {
	~int 
}
// APPRO OMIT


// ALL INVALID OMIT

type MyString string 

// ApproximateMyString is INVALID.
type ApproximateMyString interface {
	~MyString // INVALID: underlying type of MyString is not MyString
}

// ApproximateParameter is INVALID.
type ApproximateParameter[T any] interface {
	~T // INVALID: T is a type parameter
}

type MyInterface {}

// ApproximateInterface is INVALID.
type ApproximateInterface interface {
	~MyInterface // INVALID: T is an interface type
}

// ALL INVALID OMIT




// ONION EXAMPLE OMIT

// PredeclaredSignedInteger is a constraint that matches the
// five predeclared signed integer types.
type PredeclaredSignedInteger interface {
	int | int8 | int16 | int32 | int64
}

// SignedInteger is a constraint that matches any signed integer type.
type SignedInteger interface {
	~int | ~int8 | ~int16 | ~int32 | ~int64
}

// ONION EXAMPLE OMIT


// StringableSignedInteger OMIT
type StringableSignedInteger interface {
	~int | ~int8 | ~int16 | ~int32 | ~int64
	String() string
}
// StringableSignedInteger OMIT