How to map const chat* in C for codon

[qinwf]

struct Symbol
{
    const char *symbol;
    int32_t     symbol_id = -1;
    uint8_t     RESERVED_00[3];
    char        char_ref[8];
    uint64_t    tick_size  :16;
    uint64_t    RESERVED_02:48;
    uint32_t    v1 :1;
    uint32_t    v2 :1;
    uint32_t    RESERVED_03:30;
};

for this struct, how to use it in codon. Thanks.

[arshajii]

The bitfields make this somewhat tricky but here is a Codon representation that should be compatible with that C struct:

@tuple
class Symbol:
    symbol: cobj
    symbold_id: i32
    RESERVED_00_0: u8
    RESERVED_00_1: u8
    RESERVED_00_2: u8
    char_ref0: u8
    char_ref1: u8
    char_ref2: u8
    char_ref3: u8
    char_ref4: u8
    char_ref5: u8
    char_ref6: u8
    char_ref7: u8
    _padding: u8
    _bitfields1: UInt[96]
    _bitfields2: u32

    @property
    def tick_size(self):
        return int(self._bitfields1) & 0xffff

    @property
    def v1(self):
        return bool(self._bitfields1 & (UInt[96](1) << UInt[64]))

    @property
    def v2(self):
        return bool(self._bitfields1 & (UInt[96](1) << UInt[65]))

Note that the arrays are broken up into their components and the bitfields are represented as single members with getters. The cobj type represents a generic pointer (i.e. char *).

You can see the layout of the structure in C and how the fields are accessed here: https://godbolt.org/z/EzGqn5an8