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Bug 1282

Summary:	Type conversion warning
Product:	Eigen	Reporter:	ian.h.bell <ian.h.bell>
Component:	Core - general	Assignee:	Nobody <eigen.nobody>
Status:	RESOLVED FIXED
Severity:	Compilation Problem	CC:	chtz, gael.guennebaud, jacob.benoit.1
Priority:	Normal
Version:	3.3 (current stable)
Hardware:	All
OS:	Windows
Whiteboard:

Description ian.h.bell@gmail.com 2016-08-28 06:48:27 UTC

In tippy Eigen, in Visual Studio 2015 I get lots of warnings like these

2>c:\users\belli\documents\code\coolprop-v5-new\externals\eigen\eigen\src/Core/MathFunctionsImpl.h(36): warning C4305: 'argument': truncation from 'double' to 'const float'

The offending lines seem to be of the type:

const T alpha_1 = pset1<T>(4.89352455891786e-03);

Comment 1 ian.h.bell@gmail.com 2016-08-28 06:57:53 UTC

Which in turn arrives from this warning:

2>  c:\users\belli\documents\code\coolprop-v5-new\externals\eigen\eigen\src/Core/MathFunctions.h(1196): note: see reference to function template instantiation 'T Eigen::internal::generic_fast_tanh_float<float>(const T &)' being compiled
2>          with
2>          [
2>              T=float
2>          ]

caused by this function in MathFunctions.h

#if (!defined(__CUDACC__)) && EIGEN_FAST_MATH
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE
float tanh(float x) { return internal::generic_fast_tanh_float(x); }
#endif

Comment 2 Gael Guennebaud 2016-08-28 20:49:56 UTC

Thank you for the report, fixed: https://bitbucket.org/eigen/eigen/commits/2feb669163

Comment 3 Nobody 2019-12-04 16:09:11 UTC

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