Utility.h

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#ifndef CPYCPPYY_UTILITY_H
#define CPYCPPYY_UTILITY_H
 
// Standard
#include <string>
#include <vector>
 
 
namespace CPyCppyy {
 
class PyCallable;
 
extern dict_lookup_func gDictLookupOrg;
extern bool gDictLookupActive;
 
// additional converter functions
unsigned long PyLongOrInt_AsULong(PyObject* pyobject);
ULong64_t     PyLongOrInt_AsULong64(PyObject* pyobject);
 
namespace Utility {
 
// convenience functions for adding methods to classes
bool AddToClass(PyObject* pyclass, const char* label, PyCFunction cfunc,
    int flags = METH_VARARGS);
bool AddToClass(PyObject* pyclass, const char* label, const char* func);
bool AddToClass(PyObject* pyclass, const char* label, PyCallable* pyfunc);
 
// helpers for dynamically constructing operators
PyCallable* FindUnaryOperator(PyObject* pyclass, const char* op);
PyCallable* FindBinaryOperator(PyObject* left, PyObject* right,
    const char* op, Cppyy::TCppScope_t scope = 0);
PyCallable* FindBinaryOperator(const std::string& lcname, const std::string& rcname,
    const char* op, Cppyy::TCppScope_t scope = 0, bool reverse = false);
 
// helper for template classes and methods
enum ArgPreference { kNone, kPointer, kReference, kValue };
std::string ConstructTemplateArgs(
    PyObject* pyname, PyObject* tpArgs, PyObject* args = nullptr, ArgPreference = kNone, int argoff = 0, int* pcnt = nullptr);
 
// helper for generating callbacks
void ConstructCallbackPreamble(const std::string& retType,
    const std::vector<std::string>& argtypes, std::ostringstream& code);
void ConstructCallbackReturn(const std::string& retType, int nArgs, std::ostringstream& code);
 
// initialize proxy type objects
bool InitProxy(PyObject* module, PyTypeObject* pytype, const char* name);
 
// retrieve the memory buffer from pyobject, return buflength, tc (optional) is python
// array.array type code, size is type size, buf will point to buffer, and if check is
// true, some heuristics will be applied to check buffer compatibility with the type
Py_ssize_t GetBuffer(PyObject* pyobject, char tc, int size, void*& buf, bool check = true);
 
// data/operator mappings
std::string MapOperatorName(const std::string& name, bool bTakesParames);
 
struct PyOperators {
    PyOperators() : fEq(nullptr), fNe(nullptr), fLAdd(nullptr), fRAdd(nullptr),
        fSub(nullptr), fLMul(nullptr), fRMul(nullptr), fDiv(nullptr), fHash(nullptr) {}
    ~PyOperators();
 
    PyObject* fEq;
    PyObject* fNe;
    PyObject *fLAdd, *fRAdd;
    PyObject* fSub;
    PyObject *fLMul, *fRMul;
    PyObject* fDiv;
    PyObject* fHash;
};
 
// meta information
const std::string Compound(const std::string& name);
Py_ssize_t ArraySize(const std::string& name);
std::string ClassName(PyObject* pyobj);
 
// for threading: save call to PyErr_Occurred()
PyObject* PyErr_Occurred_WithGIL();
 
// helpers for collecting/maintaining python exception data
struct PyError_t {
    PyError_t() { fType = fValue = fTrace = 0; }
 
    static void Clear(PyError_t& e)
    {
    // Remove exception information.
        Py_XDECREF(e.fType); Py_XDECREF(e.fValue); Py_XDECREF(e.fTrace);
        e.fType = e.fValue = e.fTrace = 0;
    }
 
    PyObject *fType, *fValue, *fTrace;
};
 
size_t FetchError(std::vector<PyError_t>&);
void SetDetailedException(
    std::vector<PyError_t>& errors /* clears */, PyObject* topmsg /* steals ref */, PyObject* defexc);
 
// setup Python API for callbacks
bool IncludePython();
 
} // namespace Utility
 
} // namespace CPyCppyy
 
#endif // !CPYCPPYY_UTILITY_H