@ -329,13 +329,88 @@ func SliceEqualAnyOrder[T comparable](a, b Slice[T]) bool {
return true
}
// MapOf returns a view over m. It is the caller's responsibility to make sure K
// and V is immutable, if this is being used to provide a read-only view over m.
func MapOf [ K comparable , V comparable ] ( m map [ K ] V ) Map [ K , V ] {
return Map [ K , V ] { m }
// MapSlice is a view over a map whose values are slices.
type MapSlice [ K comparable , V any ] struct {
// ж is the underlying mutable value, named with a hard-to-type
// character that looks pointy like a pointer.
// It is named distinctively to make you think of how dangerous it is to escape
// to callers. You must not let callers be able to mutate it.
ж map [ K ] [ ] V
}
// MapSliceOf returns a MapSlice for the provided map. It is the caller's
// responsibility to make sure V is immutable.
func MapSliceOf [ K comparable , V any ] ( m map [ K ] [ ] V ) MapSlice [ K , V ] {
return MapSlice [ K , V ] { m }
}
// Contains reports whether k has an entry in the map.
func ( m MapSlice [ K , V ] ) Contains ( k K ) bool {
_ , ok := m . ж [ k ]
return ok
}
// IsNil reports whether the underlying map is nil.
func ( m MapSlice [ K , V ] ) IsNil ( ) bool {
return m . ж == nil
}
// Len returns the number of elements in the map.
func ( m MapSlice [ K , V ] ) Len ( ) int { return len ( m . ж ) }
// Get returns the element with key k.
func ( m MapSlice [ K , V ] ) Get ( k K ) Slice [ V ] {
return SliceOf ( m . ж [ k ] )
}
// GetOk returns the element with key k and a bool representing whether the key
// is in map.
func ( m MapSlice [ K , V ] ) GetOk ( k K ) ( Slice [ V ] , bool ) {
v , ok := m . ж [ k ]
return SliceOf ( v ) , ok
}
// MarshalJSON implements json.Marshaler.
func ( m MapSlice [ K , V ] ) MarshalJSON ( ) ( [ ] byte , error ) {
return json . Marshal ( m . ж )
}
// UnmarshalJSON implements json.Unmarshaler.
// It should only be called on an uninitialized Map.
func ( m * MapSlice [ K , V ] ) UnmarshalJSON ( b [ ] byte ) error {
if m . ж != nil {
return errors . New ( "already initialized" )
}
return json . Unmarshal ( b , & m . ж )
}
// Range calls f for every k,v pair in the underlying map.
// It stops iteration immediately if f returns false.
func ( m MapSlice [ K , V ] ) Range ( f MapRangeFn [ K , Slice [ V ] ] ) {
for k , v := range m . ж {
if ! f ( k , SliceOf ( v ) ) {
return
}
}
}
// Map is a view over a map whose values are immutable.
// AsMap returns a shallow-clone of the underlying map.
//
// If V is a pointer type, it is the caller's responsibility to make sure the
// values are immutable. The map and slices are cloned, but the values are not.
func ( m MapSlice [ K , V ] ) AsMap ( ) map [ K ] [ ] V {
if m . ж == nil {
return nil
}
out := maps . Clone ( m . ж )
for k , v := range out {
out [ k ] = slices . Clone ( v )
}
return out
}
// Map provides a read-only view of a map. It is the caller's responsibility to
// make sure V is immutable.
type Map [ K comparable , V any ] struct {
// ж is the underlying mutable value, named with a hard-to-type
// character that looks pointy like a pointer.
@ -344,8 +419,20 @@ type Map[K comparable, V any] struct {
ж map [ K ] V
}
// MapOf returns a view over m. It is the caller's responsibility to make sure V
// is immutable.
func MapOf [ K comparable , V any ] ( m map [ K ] V ) Map [ K , V ] {
return Map [ K , V ] { m }
}
// Has reports whether k has an entry in the map.
// Deprecated: use Contains instead.
func ( m Map [ K , V ] ) Has ( k K ) bool {
return m . Contains ( k )
}
// Contains reports whether k has an entry in the map.
func ( m Map [ K , V ] ) Contains ( k K ) bool {
_ , ok := m . ж [ k ]
return ok
}
@ -428,7 +515,13 @@ type MapFn[K comparable, T any, V any] struct {
}
// Has reports whether k has an entry in the map.
// Deprecated: use Contains instead.
func ( m MapFn [ K , T , V ] ) Has ( k K ) bool {
return m . Contains ( k )
}
// Contains reports whether k has an entry in the map.
func ( m MapFn [ K , T , V ] ) Contains ( k K ) bool {
_ , ok := m . ж [ k ]
return ok
}
Maisem Ali
1 week ago
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