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Bug 742

Summary:	Replace EIGEN_STATIC_ASSERTION by a true static assertion
Product:	Eigen	Reporter:	Christoph Hertzberg <chtz>
Component:	Core - general	Assignee:	Nobody <eigen.nobody>
Status:	RESOLVED WONTFIX
Severity:	enhancement	CC:	gael.guennebaud, jacob.benoit.1
Priority:	Normal
Version:	3.2
Hardware:	All
OS:	All
Whiteboard:
Bug Depends on:
Bug Blocks:	558

Description Christoph Hertzberg 2014-02-12 13:29:04 UTC

Currently EIGEN_STATIC_ASSERT must be placed in code which is actually executed. For some assertions such checking template parameters this makes it necessary to be called from all constructors.
BOOST_STATIC_ASSERT essentially makes a typedef which does not compile if the condition is false:
http://www.boost.org/doc/libs/1_55_0/boost/static_assert.hpp

This can be put anywhere inside a class and (I assume) it is guaranteed to not produce instructions regardless of optimization options.

Comment 1 Gael Guennebaud 2014-02-13 09:42:49 UTC

There is one advantage of our limited mechanism: we can turn static assertions to runtime ones for unit testing. It is also simpler: the boost version need a lot of tweaking for each compiler.

Comment 2 Gael Guennebaud 2014-10-20 13:54:18 UTC

Wontfix as this would break our current unit tests.

Comment 3 Nobody 2019-12-04 13:00:28 UTC

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