From b02dfe41b255ac663c3ac3a4475a4933186de1e7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Roman=20Smr=C5=BE?= <roman.smrz@seznam.cz>
Date: Sat, 8 May 2021 13:37:31 +0200
Subject: FRP: use BhvComp memoized value only if not dirty

---
 include/erebos/frp.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/erebos/frp.h b/include/erebos/frp.h
index 466da33..8014536 100644
--- a/include/erebos/frp.h
+++ b/include/erebos/frp.h
@@ -87,6 +87,8 @@ protected:
 	virtual bool needsUpdate(const BhvCurTime &) const;
 	virtual void doUpdate(const BhvCurTime &);
 
+	bool isDirty(const BhvCurTime &) const { return dirty; }
+
 	vector<weak_ptr<function<void(const BhvCurTime &)>>> watchers;
 private:
 	void markDirty(const BhvCurTime &, vector<shared_ptr<BhvImplBase>> &);
@@ -222,7 +224,7 @@ public:
 	{ x = g.impl->get(ctime, f.impl->get(ctime, monostate())); }
 
 	C get(const BhvCurTime & ctime, const monostate & m) const override
-	{ return x ? x.value() : g.impl->get(ctime, f.impl->get(ctime, m)); }
+	{ return x && !BhvImplBase::isDirty(ctime) ? x.value() : g.impl->get(ctime, f.impl->get(ctime, m)); }
 
 private:
 	BhvFun<monostate, B> f;
-- 
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