whatcanGOwrong

go/pkg/mod/github.com/cilium/ebpf@v0.11.0/internal/memoize.go

@@ -0,0 +1,26 @@
+package internal
+
+import (
+	"sync"
+)
+
+type memoizedFunc[T any] struct {
+	once   sync.Once
+	fn     func() (T, error)
+	result T
+	err    error
+}
+
+func (mf *memoizedFunc[T]) do() (T, error) {
+	mf.once.Do(func() {
+		mf.result, mf.err = mf.fn()
+	})
+	return mf.result, mf.err
+}
+
+// Memoize the result of a function call.
+//
+// fn is only ever called once, even if it returns an error.
+func Memoize[T any](fn func() (T, error)) func() (T, error) {
+	return (&memoizedFunc[T]{fn: fn}).do
+}