Use constexpr if in FFTWBuffer memory helper functions

Source/PS_Source/Stretch.h

@@ -27,6 +27,7 @@
 
 #include "../JuceLibraryCode/JuceHeader.h"
 #include <random>
+#include <type_traits>
 
 template<typename T>
 class FFTWBuffer
@@ -91,26 +92,20 @@ public:
 private:
     T* m_buf = nullptr;
     int m_size = 0;
-    void mallocimpl(float*& buf,int size)
+    void mallocimpl(T*& buf,int size)
     {
+        if constexpr (std::is_same<T,float>::value)
 			buf = (float*)fftwf_malloc(size*sizeof(float));
-    }
-    void mallocimpl(double*& buf,int size)
-    {
+		else
 			buf = (double*)fftw_malloc(size * sizeof(double));
     }
-    void freeimpl(float*& buf)
+	void freeimpl(T*& buf)
     {
         if (buf!=nullptr)
         {
+			if constexpr (std::is_same<T, float>::value)
 				fftwf_free(buf);
-            buf = nullptr;
-        }
-    }
-    void freeimpl(double*& buf)
-    {
-        if (buf!=nullptr)
-        {
+			else
 				fftw_free(buf);
 			buf = nullptr;
         }