table3d_axes.h

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#pragma once
 
#include "table3d_typedefs.h"
 
enum axis_domain {
    axis_domain_Rpm,
    axis_domain_Load,
};
 
static inline constexpr uint16_t axis_domain_to_factor(axis_domain domain)
{
    return domain==axis_domain_Rpm ? 100U : 2U;
}
 
class table_axis_iterator
{
public:
 
    table_axis_iterator(table3d_axis_t *pStart, const table3d_axis_t *pEnd)
     : _stride(pEnd>pStart ? stride_inc : stride_dec)
     , _pStart(pStart)
     , _pEnd(pEnd + _stride)
    {
    }
 
    table_axis_iterator& advance(int8_t steps)
    {
        _pStart = _pStart + ((int16_t)_stride * steps);
        return *this;
    }
 
    table_axis_iterator& operator++(void)
    {
        return advance(1);
    }
 
    bool at_end(void) const
    {
        return _pStart == _pEnd;
    }
 
    table3d_axis_t& operator*(void)
    {
        return *_pStart;
    }
    const table3d_axis_t& operator*(void) const
    {
        return *_pStart;
    }    
    
private:
 
    static constexpr int8_t stride_inc = 1;
    static constexpr int8_t stride_dec = -1;
    int8_t _stride;
    table3d_axis_t *_pStart;
    const table3d_axis_t *_pEnd;
};
 
#define TABLE3D_TYPENAME_AXIS(size) table3d ## size ## _axis
 
#define TABLE3D_GEN_AXIS(size) \
 \
    struct TABLE3D_TYPENAME_AXIS(size) { \
 \
        static constexpr table3d_dim_t length = (size); \
 \
        table3d_axis_t axis[(size)]; \
        \
 \
        table_axis_iterator begin(void) \
        {  \
            return table_axis_iterator(axis+(size)-1, axis); \
        } \
 \
        table_axis_iterator rbegin(void) \
        {  \
            return table_axis_iterator(axis, axis+(size)-1); \
        } \
    };
 
// This generates the axis types for the following sizes & domains:
TABLE3D_GEN_AXIS(4)
TABLE3D_GEN_AXIS(6)
TABLE3D_GEN_AXIS(8)
TABLE3D_GEN_AXIS(16)