first cmake draft, source relocation, not working

lib/LatAnalyze/Numerical/GslFFT.cpp

@@ -0,0 +1,90 @@
+/*
+ * GslFFT.cpp, part of LatAnalyze
+ *
+ * Copyright (C) 2013 - 2020 Antonin Portelli
+ *
+ * LatAnalyze is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LatAnalyze is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with LatAnalyze.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <LatAnalyze/Numerical/GslFFT.hpp>
+#include <LatAnalyze/includes.hpp>
+
+using namespace std;
+using namespace Latan;
+
+/******************************************************************************
+ *                           GslFFT implementation                            *
+ ******************************************************************************/
+// constructor /////////////////////////////////////////////////////////////////
+GslFFT::GslFFT(const Index size)
+{
+    resize(size);
+}
+
+// destructor //////////////////////////////////////////////////////////////////
+GslFFT::~GslFFT(void)
+{
+    clear();
+}
+
+// size ////////////////////////////////////////////////////////////////////////
+void GslFFT::resize(const Index size)
+{
+    if (size_ != size)
+    {
+        clear();
+        size_      = size;
+        wavetable_ = gsl_fft_complex_wavetable_alloc(size_);
+        workspace_ = gsl_fft_complex_workspace_alloc(size_);
+    }
+}
+
+// fft /////////////////////////////////////////////////////////////////////////
+void GslFFT::operator()(CMat &x, const unsigned int dir)
+{
+    if (x.size() != size_)
+    {
+        LATAN_ERROR(Size, "wrong input vector size");
+    }
+    else
+    {
+        switch (dir)
+        {
+            case FFT::Forward:
+                gsl_fft_complex_forward((double *)x.data(), 1, size_,
+                                        wavetable_, workspace_);
+                break;
+            case FFT::Backward:
+                gsl_fft_complex_backward((double *)x.data(), 1, size_,
+                                         wavetable_, workspace_);
+                break;
+            default:
+                LATAN_ERROR(Argument, "invalid FT direction");
+                break;
+        }
+    }
+}
+
+// destroy GSL objects /////////////////////////////////////////////////////////
+void GslFFT::clear(void)
+{
+    if (!wavetable_)
+    {
+        gsl_fft_complex_wavetable_free(wavetable_);
+    }
+    if (!workspace_)
+    {
+        gsl_fft_complex_workspace_free(workspace_);
+    }
+}