From b0069010f86dcc071fa6863a433a04d38126cfb5 Mon Sep 17 00:00:00 2001
From: LiviaSun <33578456+ChuyueSun@users.noreply.github.com>
Date: Mon, 15 Jul 2024 13:07:12 -0700
Subject: [PATCH] add new ema invariant (#7288)

---
 src/util/ema.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/util/ema.h b/src/util/ema.h
index 9e18fb98f..99491bc72 100644
--- a/src/util/ema.h
+++ b/src/util/ema.h
@@ -23,7 +23,7 @@ Revision History:
 class ema {
     double m_alpha, m_beta, m_value;
     unsigned m_period, m_wait;
-    bool invariant() const { return 0 <= m_alpha && m_alpha <= m_beta && m_beta <= 1; }
+    bool invariant() const { return 0 <= m_alpha && m_alpha <= m_beta && m_beta <= 1 && m_wait <= m_period; }
  public:
     ema(): m_alpha(0), m_beta(1), m_value(0), m_period(0), m_wait(0) {
         SASSERT(invariant());