This bugzilla service is closed. All entries have been migrated to https://gitlab.com/libeigen/eigen
Bug 1143 - Parsing error with template in Eigen_Colamd.h
Summary: Parsing error with template in Eigen_Colamd.h
Status: RESOLVED FIXED
Alias: None
Product: Eigen
Classification: Unclassified
Component: Sparse (show other bugs)
Version: 3.2
Hardware: All All
: Normal Unknown
Assignee: Nobody
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-01-05 09:49 UTC by Jérémie
Modified: 2019-12-04 15:18 UTC (History)
2 users (show)



Attachments
Minimal example code to reproduce the bug. (676 bytes, text/x-c++src)
2016-01-05 09:49 UTC, Jérémie
no flags Details

Description Jérémie 2016-01-05 09:49:53 UTC
Created attachment 643 [details]
Minimal example code to reproduce the bug.

In the file Eigen_Colamd.h, the line 519 "if (Col [col].length < 0)" can sometimes lead to compilation errors depending on the surrounding user code.

A seemingly benign minimal example is given in attachment, where the user creates a templated "length" function, included in a header before Eigen. This leads to compilation errors "Eigen_Colamd.h:519:19: error: parse error in template argument list" and "Eigen_Colamd.h:519:5: error: ‘length’ is not a member template function".

Using > instead of < for the comparison does the trick here, but there might be some other places where such an issue can arise.
Comment 1 Christoph Hertzberg 2016-01-06 11:04:38 UTC
Thanks for the report. This is likely caused by a gcc bug:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=10200

I worked-around using parentheses (for devel and 3.2):
https://bitbucket.org/eigen/eigen/commits/667570c89d3
https://bitbucket.org/eigen/eigen/commits/56ce6e48d77
Comment 2 Nobody 2019-12-04 15:18:57 UTC
-- GitLab Migration Automatic Message --

This bug has been migrated to gitlab.com's GitLab instance and has been closed from further activity.

You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.com/libeigen/eigen/issues/1143.

Note You need to log in before you can comment on or make changes to this bug.