I need an efficient method with low complexity to change the values of a range of bits in the bitset :
bitset<1000000> bs;
and I need to set values from 100 to 500 to TRUE for example .
what is the fastest method to accomplish this in the lowest complexity ?
using a loop wouldn't suffice for sure .
An ordinary for-loop is the easiest and fastest way:
Unfortunately:
bs
, working with masks / shifting isn't an option (e.g. see in bitset, can i use "to_ulong" for a specific range of bits?)bitset
doesn't support ranges / sub-blocks (e.g. What is the performance of std::bitset?). The same limitation is present in boost::dynamic_bitset.Also consider that
std::bitset
doesn't come with iterators, so it cannot be used with the functions in<algorithm>
library.If performance really matters you could consider an ad-hoc implementation.