Unit tests failed with the copy operation as the pointer is used.

Reverted back to providing the pointer to the coefficients.
Added a unit test to check if the coeffs are properly returned.

iir/Cascade.h

@@ -59,10 +59,7 @@ namespace Iir {
         struct IIR_EXPORT Storage
         {
 	    Storage() = delete;
-	    Storage(const int maxNumBiquads, const Biquad* const biquadArray) : maxStages(maxNumBiquads), stageArray(new Biquad[maxNumBiquads]) {
-		std::copy(biquadArray,biquadArray+maxNumBiquads,stageArray);
-	    }
-	    ~Storage() { delete [] stageArray; }
+	    Storage(const int maxNumBiquads, Biquad* const biquadArray) : maxStages(maxNumBiquads), stageArray(biquadArray) {}
 	    const int maxStages = 0;
 	    Biquad* const stageArray = nullptr;
         };
@@ -169,7 +166,7 @@ namespace Iir {
 	/**
 	 * Returns the coefficients of the entire Biquad chain
 	 **/
-        const Cascade::Storage getCascadeStorage() const
+        const Cascade::Storage getCascadeStorage()
         {
 	    const Cascade::Storage s(MaxStages, m_stages);
 	    return s;

test/custom.cpp

@@ -23,6 +23,16 @@ int main (int,char**)
 
 	Iir::Custom::SOSCascade<2> f(coeff);
 
+	auto coeffRet = f.getCascadeStorage();
+	for(int i = 0; i < 2; i++) {
+	    assert_print(coeffRet.stageArray[i].m_a0 == coeff[i][3],"m_a0 mismatch.\n");
+	    assert_print(coeffRet.stageArray[i].m_a1 == coeff[i][4],"m_a1 mismatch.\n");
+	    assert_print(coeffRet.stageArray[i].m_a2 == coeff[i][5],"m_a2 mismatch.\n");
+	    assert_print(coeffRet.stageArray[i].m_b0 == coeff[i][3],"m_b0 mismatch.\n");
+	    assert_print(coeffRet.stageArray[i].m_b1 == coeff[i][4],"m_b1 mismatch.\n");
+	    assert_print(coeffRet.stageArray[i].m_b2 == coeff[i][5],"m_b2 mismatch.\n");
+	}
+
 	double b = 0;
 	double b2 = 0;
 	for(int i=0;i<10000;i++)