clang-format for Eigen matrix initialization

Question

To inialize for example Eigen::Matrix3i we can use syntax:

Eigen::Matrix3i T;
T << 1, 0, 0,
     0, 2, 0,
     0, 0, 3;

However, when using clang-format (3.6 in my case) with Google style this nice initialization turns into:

Eigen::Matrix3i T;
T << 1, 0, 0, 0, 2, 0, 0, 0, 3;

Is there an easy way to avoid this? Is there a way to tell clang-format to skip something like this?

score 7 · Accepted Answer · answered Apr 13 '16 at 11:07

7

It looks like your only option is to use a rather ugly clang-format switching syntax:

Eigen::Matrix3i T;
// clang-format off
T << 1, 0, 0,
     0, 2, 0,
     0, 0, 3;
// clang-format on

answered Apr 13 '16 at 11:07

yuyoyuppe

7

Uglifying the code so the prettifier doesn't uglify it seems to be sort of invalidating the point though. – Cubic Apr 13 '16 at 11:09
Ugh. Well, this is a solution, but yeah, I agree with @Cubic here. I will leave the question open for some time in case somebody comes up with something else. If this does not happen, I will accept this as an answer. – niosus Apr 13 '16 at 11:23
@Cubic yeah, I agree too, but this solution could be viable if you're forced to use two coding styles(e.g. for checkout and commits) and in similar situations – yuyoyuppe Apr 13 '16 at 11:26

score 2 · Answer 2 · answered May 03 '22 at 07:45

2

Did you try this?

Eigen::Matrix3i T;
T << 1, 0, 0, //
     0, 2, 0, //
     0, 0, 3; //

answered May 03 '22 at 07:45

Joan Solà

Same answer as others. – Kaveh May 03 '22 at 13:02
What do you mean? There is only one other answer and it's different than this. – Joan Solà May 04 '22 at 17:21

2 Answers2