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Bug 910

Summary: Provide Ref<SparseMatrix>/Ref<const SparseMatrix>
Product: Eigen Reporter: Christoph Hertzberg <chtz>
Component: SparseAssignee: Nobody <eigen.nobody>
Status: DECISIONNEEDED ---    
Severity: Feature Request CC: chtz, gael.guennebaud
Priority: Normal    
Version: 3.3 (current stable)   
Hardware: All   
OS: All   
Bug Depends on:    
Bug Blocks: 897    

Description Christoph Hertzberg 2014-12-01 15:27:17 UTC
Storing references to sparse matrices is not directly possible at the moment but it would help solving Bug 897.
A question is whether Block<SparseMatrix> objects shall be storeable into a Ref object.

Similar to Ref<const Matrix<...> >, a Ref<const SparseMatrix> can hold a temporary if the passed matrix is not storage compatible with the Ref object.
Similar to Bug 884, we can think about a Ref<const SparseMatrix&> variant.
Comment 1 Christoph Hertzberg 2014-12-02 14:50:36 UTC
To efficiently solve bug 897 we need some kind of ForceCompressed flag. 
And I guess storing Block<SparseMatrix> directly has rather limited use (at least I would not enable it by default).
Comment 2 Gael Guennebaud 2015-02-09 11:42:45 UTC
Almost done:

Still have to add an option to enforce compressed storage.
Comment 3 Gael Guennebaud 2015-06-09 21:11:44 UTC
Changeset:   284bd8c6daa2
User:        ggael
Date:        2015-06-09 21:11:24+00:00
Summary:     Bug 910: add a StandardCompressedFormat option to Ref<SparseMatrix> to enforce standard compressed storage format.
If the input is not compressed, then this trigger a copy for a const Ref, and a runtime assert for non-const Ref.
Comment 4 Nobody 2019-12-04 13:55:46 UTC
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