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Use bit manipulation techniques to optimize memory usage and computational efficiency in data structures and enums. For flag enums, consistently use bit-shift notation (1 << n) to make bit positions explicit and enable efficient bitwise operations. For compact data representation, leverage bitfields within unions to pack multiple boolean flags into minimal memory space.

Example of bit-shift enum notation:

enum eRectCorner {
    CORNER_NONE        = 0,
    CORNER_TOPLEFT     = 1 << 0,
    CORNER_TOPRIGHT    = 1 << 1,
    CORNER_BOTTOMRIGHT = 1 << 2,
    CORNER_BOTTOMLEFT  = 1 << 3
};

Example of bitfield optimization:

union {
    uint16_t all = 0;
    struct {
        bool buffer : 1;
        bool damage : 1;
        bool scale : 1;
        // ... more flags
    };
};

This approach reduces memory footprint, enables efficient bitwise operations for flag combinations, and leverages compiler optimizations for bit manipulation algorithms.