julianwogersien / fast-add-one

can add 1 to any integer fast

fast add one

can add one to any integer fast

how to use?

copy fast_add.h into your project and include whereever you need it and use the fast_add_one function if you want to add one to anything but its fast
theres functions for different lengths of integer, they all use a suffix of the first letter of their name for example the function for short is fast_add_ones

how does it work?

it uses the bitwise not operator and then negates that the reason this works is because of how two's complement works lets say we have 1 which is 0000 0001 in binary
then we bitwise not that which is 1111 1110 which is -2 in decimal
then we negate that so we get 2

why is this code shit?

this code is shit because i wrote this in like 5 minutes and then decided to put it on github
i might improve upon this in the future but for now it is how it is