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Bug 1143 - Parsing error with template in Eigen_Colamd.h
Summary: Parsing error with template in Eigen_Colamd.h
Alias: None
Product: Eigen
Classification: Unclassified
Component: Sparse (show other bugs)
Version: 3.2
Hardware: All All
: Normal Unknown
Assignee: Nobody
Depends on:
Reported: 2016-01-05 09:49 UTC by Jérémie
Modified: 2016-01-06 11:04 UTC (History)
2 users (show)

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:

I worked-around using parentheses (for devel and 3.2):

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