Add/remove necessary special member functions

Quite surprising to find the PFFFT C++ class had a non-deleted
copy constructor. Add move/move assignment to make this a little
nicer to work with.

pffft/pffft.hpp

@@ -167,7 +167,18 @@ public:
    */
   Fft( int length, int stackThresholdLen = 4096 );
 
-
+  Fft(const Fft&) = delete;
+  Fft& operator=(const Fft&) = delete;
+  Fft(Fft&& other) : setup(std::move(other.setup)), work(other.work),
+                     length(other.length), stackThresholdLen(other.stackThresholdLen) {
+      other.work = nullptr;
+      other.length = 0;
+  };
+  Fft& operator=(Fft&& other) {
+      std::swap(setup, other.setup);
+      std::swap(work, other.work);
+      return *this;
+  };
   /*
    * constructor or prepareLength() produced a valid FFT instance?
    * delivers false for invalid FFT sizes
@@ -388,7 +399,7 @@ public:
 
 private:
   detail::Setup<T> setup;
-  Scalar* work;
+  Scalar* work{};
   int length;
   int stackThresholdLen;
 };
@@ -439,6 +450,15 @@ public:
   Setup()
     : self(NULL)
   {}
+  Setup(const Setup&) = delete;
+  Setup& operator=(const Setup&) = delete;
+  Setup(Setup&& other) : self(other.self) {
+    other.self = nullptr;
+  }
+  Setup& operator=(Setup&& other) {
+    std::swap(self, other.self);
+    return *this;
+  }
 
   ~Setup() { pffft_destroy_setup(self); }
 
@@ -503,6 +523,15 @@ public:
   Setup()
     : self(NULL)
   {}
+  Setup(const Setup&) = delete;
+  Setup& operator=(const Setup&) = delete;
+  Setup(Setup&& other) : self(other.self) {
+    other.self = nullptr;
+  }
+  Setup& operator=(Setup&& other) {
+    std::swap(self, other.self);
+    return *this;
+  }
 
   ~Setup() { pffft_destroy_setup(self); }
 
@@ -563,6 +592,15 @@ public:
   Setup()
     : self(NULL)
   {}
+  Setup(const Setup&) = delete;
+  Setup& operator=(const Setup&) = delete;
+  Setup(Setup&& other) : self(other.self) {
+    other.self = nullptr;
+  }
+  Setup& operator=(Setup&& other) {
+    std::swap(self, other.self);
+    return *this;
+  }
 
   ~Setup() { pffftd_destroy_setup(self); }
 
@@ -629,6 +667,15 @@ public:
   Setup()
     : self(NULL)
   {}
+  Setup(const Setup&) = delete;
+  Setup& operator=(const Setup&) = delete;
+  Setup(Setup&& other) : self(other.self) {
+    other.self = nullptr;
+  }
+  Setup& operator=(Setup&& other) {
+    std::swap(self, other.self);
+    return *this;
+  }
 
   ~Setup() { pffftd_destroy_setup(self); }
 
@@ -687,8 +734,7 @@ public:
 
 template<typename T>
 inline Fft<T>::Fft(int length, int stackThresholdLen)
-  : work(NULL)
-  , length(0)
+  : length(0)
   , stackThresholdLen(stackThresholdLen)
 {
 #if (__cplusplus >= 201103L || (defined(_MSC_VER) && _MSC_VER >= 1900))