From c41f64111f5f828697fdfa7f10a02724bdcb46cc Mon Sep 17 00:00:00 2001
From: reuk <reuk@users.noreply.github.com>
Date: Mon, 23 Aug 2021 16:45:44 +0100
Subject: [PATCH] FilterDesign:  Add assertions to catch misuse of design
 functions

---
 .../juce_dsp/filter_design/juce_FilterDesign.cpp    | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/modules/juce_dsp/filter_design/juce_FilterDesign.cpp b/modules/juce_dsp/filter_design/juce_FilterDesign.cpp
index c6a50ab091..826cba0ac1 100644
--- a/modules/juce_dsp/filter_design/juce_FilterDesign.cpp
+++ b/modules/juce_dsp/filter_design/juce_FilterDesign.cpp
@@ -386,16 +386,19 @@ ReferenceCountedArray<IIR::Coefficients<FloatType>>
                                                                      FloatType passbandAmplitudedB,
                                                                      FloatType stopbandAmplitudedB)
 {
-    jassert (sampleRate > 0);
-    jassert (frequency > 0 && frequency <= sampleRate * 0.5);
-    jassert (normalisedTransitionWidth > 0 && normalisedTransitionWidth <= 0.5);
-    jassert (passbandAmplitudedB > -20 && passbandAmplitudedB < 0);
-    jassert (stopbandAmplitudedB > -300 && stopbandAmplitudedB < -20);
+    jassert (0 < sampleRate);
+    jassert (0 < frequency && frequency <= sampleRate * 0.5);
+    jassert (0 < normalisedTransitionWidth && normalisedTransitionWidth <= 0.5);
+    jassert (-20 < passbandAmplitudedB && passbandAmplitudedB < 0);
+    jassert (-300 < stopbandAmplitudedB && stopbandAmplitudedB < -20);
 
     auto normalisedFrequency = frequency / sampleRate;
 
     auto fp = normalisedFrequency - normalisedTransitionWidth / 2;
+    jassert (0.0 < fp && fp < 0.5);
+
     auto fs = normalisedFrequency + normalisedTransitionWidth / 2;
+    jassert (0.0 < fs && fs < 0.5);
 
     double Ap = passbandAmplitudedB;
     double As = stopbandAmplitudedB;