Base: modernize C++11

* remove redundant void-arg
* use nullptr
* replace deprecated headers

src/Base/PersistencePyImp.cpp

@@ -34,13 +34,13 @@
 using namespace Base;
 
 // returns a string which represent the object e.g. when printed in python
-std::string PersistencePy::representation(void) const
+std::string PersistencePy::representation() const
 {
     return std::string("<persistence object>");
 }
 
 
-Py::String PersistencePy::getContent(void) const
+Py::String PersistencePy::getContent() const
 {
     Base::StringWriter writer;
     // force all objects to write pure XML without files
@@ -50,7 +50,7 @@ Py::String PersistencePy::getContent(void) const
     return  Py::String (writer.getString());
 }
 
-Py::Int PersistencePy::getMemSize(void) const
+Py::Int PersistencePy::getMemSize() const
 {
     return Py::Int((long)getPersistencePtr()->getMemSize());
 }
@@ -58,10 +58,10 @@ Py::Int PersistencePy::getMemSize(void) const
 PyObject* PersistencePy::dumpContent(PyObject *args, PyObject *kwds)
 {
     int compression = 3;
-    static char* kwds_def[] = {"Compression",NULL};
+    static char* kwds_def[] = {"Compression",nullptr};
     PyErr_Clear();
     if (!PyArg_ParseTupleAndKeywords(args, kwds, "|i", kwds_def, &compression)) {
-        return NULL;
+        return nullptr;
     }
 
     //setup the stream. the in flag is needed to make "read" work
@@ -71,22 +71,22 @@ PyObject* PersistencePy::dumpContent(PyObject *args, PyObject *kwds)
     }
     catch (...) {
        PyErr_SetString(PyExc_IOError, "Unable parse content into binary representation");
-       return NULL;
+       return nullptr;
     }
 
     //build the byte array with correct size
     if(!stream.seekp(0, stream.end)) {
         PyErr_SetString(PyExc_IOError, "Unable to find end of stream");
-        return NULL;
+        return nullptr;
     }
 
     std::stringstream::pos_type offset = stream.tellp();
     if (!stream.seekg(0, stream.beg)) {
         PyErr_SetString(PyExc_IOError, "Unable to find begin of stream");
-        return NULL;
+        return nullptr;
     }
 
-    PyObject* ba = PyByteArray_FromStringAndSize(NULL, offset);
+    PyObject* ba = PyByteArray_FromStringAndSize(nullptr, offset);
 
     //use the buffer protocol to access the underlying array and write into it
     Py_buffer buf = Py_buffer();
@@ -94,14 +94,14 @@ PyObject* PersistencePy::dumpContent(PyObject *args, PyObject *kwds)
     try {
         if(!stream.read((char*)buf.buf, offset)) {
             PyErr_SetString(PyExc_IOError, "Error copying data into byte array");
-            return NULL;
+            return nullptr;
         }
         PyBuffer_Release(&buf);
     }
     catch(...) {
         PyBuffer_Release(&buf);
         PyErr_SetString(PyExc_IOError, "Error copying data into byte array");
-        return NULL;
+        return nullptr;
     }
 
     return ba;
@@ -111,21 +111,21 @@ PyObject* PersistencePy::restoreContent(PyObject *args)
 {
     PyObject* buffer;
     if( !PyArg_ParseTuple(args, "O", &buffer) )
-        return NULL;
+        return nullptr;
 
     //check if it really is a buffer
     if( !PyObject_CheckBuffer(buffer) ) {
         PyErr_SetString(PyExc_TypeError, "Must be a buffer object");
-        return NULL;
+        return nullptr;
     }
 
     Py_buffer buf;
     if(PyObject_GetBuffer(buffer, &buf, PyBUF_SIMPLE) < 0)
-        return NULL;
+        return nullptr;
 
     if(!PyBuffer_IsContiguous(&buf, 'C')) {
         PyErr_SetString(PyExc_TypeError, "Buffer must be contiguous");
-        return NULL;
+        return nullptr;
     }
 
     //check if it really is a buffer
@@ -136,7 +136,7 @@ PyObject* PersistencePy::restoreContent(PyObject *args)
     }
     catch (...) {
         PyErr_SetString(PyExc_IOError, "Unable to restore content");
-        return NULL;
+        return nullptr;
     }
 
     Py_Return;
@@ -144,7 +144,7 @@ PyObject* PersistencePy::restoreContent(PyObject *args)
 
 PyObject *PersistencePy::getCustomAttributes(const char*) const
 {
-    return 0;
+    return nullptr;
 }
 
 int PersistencePy::setCustomAttributes(const char*,PyObject*)