1 files changed, 23 insertions, 0 deletions
diff --git a/src/gobang.go b/src/gobang.go
index 38ae50a..a75688d 100644
--- a/src/gobang.go
+++ b/src/gobang.go
@@ -32,6 +32,10 @@ const (
 )
 
 
+type SetT[T comparable] struct{
+	data map[T]struct{}
+}
+
 type PairT[A any, B any] struct{
 	L A
 	R B
@@ -54,6 +58,7 @@ const (
 	SQLiteNow = "strftime('%Y-%m-%dT%H:%M:%f000000Z', 'now')"
 )
 
+
 var (
 	level LogLevel = LevelInfo
 	emitMetric = true
@@ -70,6 +75,24 @@ var (
 
 
 
+func SetOf[T comparable](values ...T) SetT[T] {
+	s := SetT[T]{
+		data: map[T]struct{}{
+		},
+	}
+
+	for _, value := range values {
+		s.data[value] = struct{}{}
+	}
+
+	return s
+}
+
+func Contains[T comparable](set SetT[T], value T) bool {
+	_, ok := set.data[value]
+	return ok
+}
+
 func MapIndexed[A any, B any](fn func(A, int) B, coll []A) []B {
 	out := make([]B, len(coll))
 	for i, x := range coll {