template for c++ interface with swig

HySoP/CMakeLists.txt

@@ -82,6 +82,13 @@ set(PACKAGE_NAME HySoP)
 # - Global setup (interp and lib) -
 find_package(PythonFull REQUIRED)
 include(FindPythonModule)
+find_package(SWIG 2.0.7 REQUIRED)
+# WARNING FP : for cmake < 3.0 UseSWIG.cmake
+# does not work properly (bug for swig outdir)
+if(CMAKE_VERSION VERSION_LESS 3.0.0)
+  set(SWIG_USE_FILE ${CMAKE_SOURCE_DIR}/cmake/UseSWIG.cmake)
+endif()
+include(${SWIG_USE_FILE})
 
 # - python packages -
 find_python_module(numpy REQUIRED)

HySoP/setup.py.in

@@ -7,6 +7,42 @@ setup.py file for @PYPACKAGE_NAME@
 from numpy.distutils.core import setup, Extension
 from numpy.distutils.misc_util import Configuration
 import os
+import glob
+
+
+def create_swig_extension(name, src_dirs=None, sources=None):
+    """Create a python module from C++ files, using swig
+    """
+    if sources is None:
+        sources = []
+        assert src_dirs is not None
+        for sdir in src_dirs:
+            #sources += glob.glob(os.path.join(sdir, '*.i'))
+            sources += glob.glob(os.path.join(sdir, '*.cpp'))
+    swig_dir = os.path.join('@CMAKE_SOURCE_DIR@', 'swig')
+    sources.insert(0, os.path.join(swig_dir, 'cpp2hysop.i'))
+    inc_dirs = set([])
+    for f in sources:
+        inc_dirs.add(os.path.dirname(f))
+    inc_dirs = list(inc_dirs)
+    #  To avoid -I -I in compiler call, which results in a bug:
+    #while inc_dir.count('') > 0:
+    #    inc_dir.remove('')
+    #inc_dir.append('@CMAKE_BINARY_DIR@/Modules')
+    swig_opts = ['-I' + swig_dir,
+                 #-outdir', '/Users/Franck/toto',
+                 '-c++', '-modern',
+                 ]
+    extra_link_args = []  # ['-lopenblas', '-lgomp']
+    name = 'hysop._' + name
+    swig_ext = Extension(name, sources=sources, language='c++',
+                         swig_opts=swig_opts,
+                         extra_link_args=extra_link_args,
+                         include_dirs=inc_dirs,
+                         extra_compile_args=[''])
+
+    return swig_ext
+
 
 # Full package name
 name = '@PYPACKAGE_NAME@'
@@ -50,6 +86,7 @@ ext_modules = []
 # Check if libhysop was created
 enable_fortran = "@WITH_LIB_FORTRAN@"
 
+
 if enable_fortran is "ON":
     inc_dir = '@MPI_Fortran_INCLUDE_PATH@'.split(';')
     #  To avoid -I -I in compiler call. Result in a bug:
@@ -104,6 +141,21 @@ else:
 
 data_files = []
 
+# --- C++ files and swig interface --
+# path to .i files
+swig_dirs = [os.path.join('@CMAKE_SOURCE_DIR@','swig')]
+
+# C++ files and swig interface
+cpp_src_dirs = ['src/fftw']
+for sd in cpp_src_dirs:
+    swig_dirs.append(os.path.join('@CMAKE_SOURCE_DIR@', sd))
+ext = {}
+ext['cpp2hysop'] = create_swig_extension(
+    name='cpp2hysop', src_dirs=swig_dirs)
+for ex in ext:
+    ext_modules.append(ext[ex])
+
+
 if "@WITH_GPU@" is "ON":
     cl_src_dirs = ["cl_src", "cl_src/kernels",
                    "cl_src/advection", "cl_src/remeshing"]

HySoP/src/fftw/fftw.cpp

+#include "fftw.hpp"
+#include <iostream>
+
+
+namespace fftw
+{
+
+  FFTW_solver::FFTW_solver(int d):_dimension(d)
+  {
+    std::cout << "init fftw c++, dim =" << _dimension <<  std::endl;
+  }
+
+  int FFTW_solver::run()
+  {
+    std::cout << "run fftw c++" << std::endl;
+    return 1;
+  }
+ 
+  
+}

HySoP/src/fftw/fftw.hpp

+#ifndef FFTW_HPP
+#define FFTW_HPP
+
+namespace fftw
+{
+
+  /** */
+  class FFTW_solver
+  {
+  private:
+
+    /** */
+    int _dimension;
+    
+  public:
+
+    FFTW_solver(int d);
+
+    int run();
+
+  };
+  
+}
+
+
+#endif

HySoP/swig/cpp2hysop.i

+// -*- C++ -*-
+%module cpp2hysop
+
+%include start.i
+
+%include fftw.i

HySoP/swig/fftw.i

+// -*- C++ -*-
+%{
+  #include "fftw.hpp"
+%}
+
+%include "fftw.hpp"

HySoP/swig/start.i

+%{
+#define SWIG_FILE_WITH_INIT
+#include <assert.h>
+%}
+// numpy macros
+%include numpy.i 	
+
+%init %{
+  import_array();
+%}