LowLevelViews.h

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#ifndef CPYCPPYY_LOWLEVELVIEWS_H
#define CPYCPPYY_LOWLEVELVIEWS_H
 
// Bindings
#include "Dimensions.h"
 
// Standard
#include <complex>
#include <stddef.h>
#if (__cplusplus > 201402L) || (defined(_MSC_VER) && _MSVC_LANG > 201402L)
#include <cstddef>
#endif
 
 
namespace CPyCppyy {
 
class Converter;
 
class LowLevelView {
public:
    enum EFlags {
        kDefault     = 0x0000,
        kIsCppArray  = 0x0001,    // allocated with new[]
        kIsFixed     = 0x0002,    // fixed size array (assumed flat)
        kIsOwner     = 0x0004 };  // Python owns
 
public:
    PyObject_HEAD
    Py_buffer   fBufInfo;
    void**      fBuf;
    Converter*  fConverter;
    Converter*  fElemCnv;
 
    typedef LowLevelView* (*Creator_t)(void*, cdims_t);
    Creator_t   fCreator;    // for slicing, which requires copying
 
public:
    void* get_buf() { return fBuf ? *fBuf : fBufInfo.buf; }
    void  set_buf(void** buf) { fBuf = buf; fBufInfo.buf = get_buf(); }
 
    bool resize(size_t sz);
};
 
#define CPPYY_DECL_VIEW_CREATOR(type)                                        \
    PyObject* CreateLowLevelView(type*,  cdims_t shape);                     \
    PyObject* CreateLowLevelView(type**, cdims_t shape)
 
CPPYY_DECL_VIEW_CREATOR(bool);
CPPYY_DECL_VIEW_CREATOR(char);
CPPYY_DECL_VIEW_CREATOR(signed char);
CPPYY_DECL_VIEW_CREATOR(unsigned char);
#if (__cplusplus > 201402L) || (defined(_MSC_VER) && _MSVC_LANG > 201402L)
CPPYY_DECL_VIEW_CREATOR(std::byte);
#endif
PyObject* CreateLowLevelView_i8(int8_t*,  cdims_t shape);
PyObject* CreateLowLevelView_i8(int8_t**, cdims_t shape);
PyObject* CreateLowLevelView_i8(uint8_t*,  cdims_t shape);
PyObject* CreateLowLevelView_i8(uint8_t**, cdims_t shape);
PyObject* CreateLowLevelView_i16(int16_t*,  cdims_t shape);
PyObject* CreateLowLevelView_i16(int16_t**, cdims_t shape);
PyObject* CreateLowLevelView_i16(uint16_t*,  cdims_t shape);
PyObject* CreateLowLevelView_i16(uint16_t**, cdims_t shape);
PyObject* CreateLowLevelView_i32(int32_t*,  cdims_t shape);
PyObject* CreateLowLevelView_i32(int32_t**, cdims_t shape);
PyObject* CreateLowLevelView_i32(uint32_t*,  cdims_t shape);
PyObject* CreateLowLevelView_i32(uint32_t**, cdims_t shape);
 
CPPYY_DECL_VIEW_CREATOR(short);
CPPYY_DECL_VIEW_CREATOR(unsigned short);
CPPYY_DECL_VIEW_CREATOR(int);
CPPYY_DECL_VIEW_CREATOR(unsigned int);
CPPYY_DECL_VIEW_CREATOR(long);
CPPYY_DECL_VIEW_CREATOR(unsigned long);
CPPYY_DECL_VIEW_CREATOR(long long);
CPPYY_DECL_VIEW_CREATOR(unsigned long long);
CPPYY_DECL_VIEW_CREATOR(float);
CPPYY_DECL_VIEW_CREATOR(double);
CPPYY_DECL_VIEW_CREATOR(long double);
CPPYY_DECL_VIEW_CREATOR(std::complex<float>);
CPPYY_DECL_VIEW_CREATOR(std::complex<double>);
CPPYY_DECL_VIEW_CREATOR(std::complex<int>);
CPPYY_DECL_VIEW_CREATOR(std::complex<long>);
 
PyObject* CreateLowLevelViewString(char**, cdims_t shape);
PyObject* CreateLowLevelViewString(const char**, cdims_t shape);
 
inline PyObject* CreatePointerView(void* ptr, cdims_t shape = 0) {
    return CreateLowLevelView((uintptr_t*)ptr, shape);
}
 
//- low level view type and type verification --------------------------------
extern PyTypeObject LowLevelView_Type;
 
template<typename T>
inline bool LowLevelView_Check(T* object)
{
    return object && PyObject_TypeCheck(object, &LowLevelView_Type);
}
 
template<typename T>
inline bool LowLevelView_CheckExact(T* object)
{
    return object && Py_TYPE(object) == &LowLevelView_Type;
}
 
} // namespace CPyCppyy
 
#endif // !CPYCPPYY_LOWLEVELVIEWS_H