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also be able to use 32 or 64 bits bitmaps very efficiently
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#include <mysys/my_bitmap.h>
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template <uint32_t default_width> class Bitmap
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uint32_t buffer[(default_width+31)/32];
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void init() { bitmap_init(&map, buffer, default_width, 0); }
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void init(uint32_t prefix_to_set) { init(); set_prefix(prefix_to_set); }
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uint32_t length() const { return default_width; }