## Is there a trivial way to get the 2's complement of an std::bitset<N>

trivial antonym

trivial meaning

non trivial meaning

trivial pursuit

how to pronounce trivial

trivial solution meaning

trivial noun

I was using `std::bitset<N>`

in my program and needed to find the least significant set bit and did the trivial calculation as below :

int num = 5; int res = num & (-num);

After which the least significant bit of `num`

is set in `res`

and rest all are `0`

's. This works as `-5`

is represented in 2's complement notation.

But I found `std::bitset<N>`

doesn't have any operator overload for unary `operator -`

which would have given me the 2's complement for the underlying bits. Is there a trivial way to implement the 2's complement with `std::bitset<N>`

? I could always use `operator ~`

to flip the bits and loop over them doing the sum and carry starting from LSB to MSB, but I was looking for a solution which would avoid that.

`std::bitset`

doesn't provide any complement methods. Since you would have to calculate the complement yourself with `operator~`

and an additional loop, simply skip `operator~()`

and search for the LSB directly:

template <int N> size_t least_significant_bit(const std::bitset<N> &bt){ for(size_t i = 0; i < bt.size(); ++i){ if(bt.test(i)) return i; } }

I guess it can't get more trivial than that ;).

Note that the result of `least_significant_bit`

isn't specified if there's no bit at all. One could return `N`

or change the loop in order to test `bt.test(N)`

which would throw an exception, but after all it doesn't really make sense to look for a LSB in a nulled bitset.

Further note, you can use `std::bitset<N>::operator[]`

instead of `std::bitset<N>::test`

if you're not interested in boundary checks.

**Trivial,** How to use trivial in a sentence. to the mathematically simplest case, but the rest of us tend to use it just to mean "unimportant. 1589, in the meaning defined at sense 2 of little worth or importance Don't get angry about trivial matters. Is there a trivial way to get a text-editor (like nano) on RancherOS? Ask Question Asked 1 year, 6 months ago. Active yesterday. Viewed 2k times 1. I just want to

a quite convenient method for doing two's complement is finding the least significant 0 in your bitset, setting that to 1 and setting all less significant bits to 0.

pseudocode: (assuming that set[0] is the least significant bit, if not, turn it around)

int i = 0; while (i < set.length && set[i]) { set[i] = 0; ++i; } if (i < set.length) set[i] = 1;

**Use trivial in a sentence,** How to use trivial in a sentence. It was utterly ridiculous to cry about something so trivial, and yet it felt good. misdemeanants; the second division was allotted to persons guilty of trivial offences not amounting to moral Vedius Pollio, in the time of Augustus, was said to have thrown his slaves, condemned sometimes for � There are a ton of really fun board games that can entertain groups of people. Whether it's a family game night or a group of friends getting together to have some fun, board games are the way to go for a lot of people. There are board games based around just about everything, but one of the most popular board games is Trivial Pursuit.

this should do it unless I am missing something

`std::bitset<N> twos_comp = std::bitset<N>((~input).to_ulong() + 1);`

**Trivial Pursuit Rules: How Do You Play Trivial Pursuit? – How Do ,** gameboard, 150 adult question cards, 150 children question cards, 2 card holders, If you already have the wedge offered by that space then you treat it as a� On this page you will find the solution to Trivial lie crossword clue. This clue was last seen on Daily Celebrity Crossword July 29 2020 In case the clue doesn’t fit or there’s something wrong please contact us! CROSSWORD CLUE: Trivial lie SOLUTION: FIB Done with Trivial lie? Go back and see the other crossword clues for Daily Celebrity Crossword July 29 2020. Related

**Trivial,** Trivial definition, of very little importance or value; insignificant: Don't bother me with trivial matters. to the systematic nomenclature: Picric acid is the trivial name of 2,4,6-trinitrophenol. Be adamantine, and get after that perfect score! or street corner, hence commonplace, equivalent to tri- tri- + vi(a) road + -ālis -al� Way definition is - a thoroughfare for travel or transportation from place to place. How to use way in a sentence. Synonym Discussion of way.

**Triviality (mathematics),** (October 2013) (Learn how and when to remove this template message). In mathematics, the adjective trivial is often used to refer to a claim or a case which can be "Trivial" can also be used to describe solutions to an equation that have a very For instance, proofs by mathematical induction have two parts: the "base � There are a number of very cruel and evil people which is unpleasant. As is common with TV there are just a lot of very unrealistic behavior which gets kind of frustrating to watch. Finally, the promiscuity among the, forty something, characters will practically give you whiplash.

**Trivial Pursuit,** Trivial Pursuit is a board game from Canada in which winning is determined by a player's ability to answer general knowledge and popular culture questions. Players move their pieces around a board, the squares they land on Several different general knowledge editions (such as Genus II) have followed. Other editions� I don’t think there’s a right way to remember things. I think it’s just a matter of reading stuff, and staying curious. The more curious you are, the better off you’re going to be.

##### Comments

- Certainly there are a lot of
**non-trivial**ways of doing almost anything! - I noticed I should have used
**trivial**:-p Will edit the title. - Note that looping over the flipped bitset is most-likely as fast as simply looping over the original bitset in order to find the least significant bit (which I find the trivial solution in this case ;))
- @Zeta Of-course, why didn't I think of it !! That's what I'll end up doing perhaps.
- Sorry for the index mess, I was thinking in terms of
`to_string()`

(*"The resulting string contains N characters with the first character corresponds to the last (N-1th) bit and the last character corresponding to the first bit."*) instead of using simple bit logic >.< - There is no
`operator -`

or`operator +`

, hence the inconvenience :-) - don't forget to handle the all ones case