simplify length()

9 jobs for halfedge-vector-and-length in 6 minutes and 16 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed clang-c++11 #77849
Linux

00:04:08

passed cppcheck #77851
Linux

00:06:16

passed doc #77856
Linux

00:00:32

passed gcc-c++11 #77848
Linux

00:02:19

passed macos-c++11 #77850
Apple

00:01:52

passed VS2015-32-bit #77855
VS2015

00:01:18

passed VS2015-64-bit #77854
VS2015

00:01:26

passed VS2017-32-bit #77853
VS2017

00:01:18

passed VS2017-64-bit #77852
VS2015

00:01:33