modernize C++: use nullptr

src/App/ElementMap.h

@@ -122,7 +122,7 @@ public:
                            std::ostringstream& ss,
                            ElementIDRefs* sids,
                            long masterTag,
-                           const char* postfix = 0,
+                           const char* postfix = nullptr,
                            long tag = 0,
                            bool forceTag = false) const;
 
@@ -183,7 +183,7 @@ public:
 
     long getElementHistory(const MappedName & name,
                            long masterTag,
-                           MappedName *original=0, std::vector<MappedName> *history=0) const;
+                           MappedName *original=nullptr, std::vector<MappedName> *history=nullptr) const;
 
 private:
     /** Serialize this map

src/App/StringHasherPyImp.cpp

@@ -63,12 +63,12 @@ PyObject* StringHasherPy::getID(PyObject *args)
 {
    long id = -1;
    int index = 0;
-   PyObject *value = 0;
+   PyObject *value = nullptr;
    PyObject *base64 = Py_False;
    if (!PyArg_ParseTuple(args, "l|i",&id,&index)) {
        PyErr_Clear();
        if (!PyArg_ParseTuple(args, "O|O",&value,&base64))
-           return NULL;    // NULL triggers exception
+           return nullptr;
    }
    if(id>0) {
        PY_TRY {
@@ -139,7 +139,7 @@ Py::Dict StringHasherPy::getTable() const {
 
 PyObject *StringHasherPy::getCustomAttributes(const char* /*attr*/) const
 {
-   return 0;
+   return nullptr;
 }
 
 int StringHasherPy::setCustomAttributes(const char* /*attr*/, PyObject* /*obj*/)