Boost multiprecision fails because the implementation of complex tries to cast to double in internal functions like _Isinf or _Isnan

Question

I need a BSD-like licensed C(++) multiprecision library with complex numbers support so I tried boost.

The following code fails:

#include <boost/multiprecision/cpp_dec_float.hpp>
#include <complex>

using namespace boost::multiprecision;    
std::complex<cpp_dec_float_50>(1.0, 2.0) / std::complex<cpp_dec_float_50>(1.0, 2.0)

in Visual Studio 2012 with an error C2440 because the implementation of complex tries to cast to double in internal functions like _Isinf or _Isnan.

Is this an error on my part? How can I fix this? Are there better libraries?

score 3 · Answer 1 · answered May 31 '13 at 17:12

3

From C++11 26.4/2:

The effect of instantiating the template complex for any type other than float, double, or long double is unspecified.

So you can't reliably use std::complex with other types, but perhaps boost has a complex type that works with cpp_dec_float_50.

answered May 31 '13 at 17:12

Mark B

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Afaik boost only has some extensions to std::complex in tr1/complex.hpp but no replacement. – xnor May 31 '13 at 18:26

score 1 · Answer 2 · edited Jul 29 '13 at 19:54

1

GCC 4.7 will allow you to use boost multiprecision floats with std::complex<>.

edited Jul 29 '13 at 19:54

bensiu

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answered Jul 29 '13 at 19:32

user6552

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Boost multiprecision fails because the implementation of complex tries to cast to double in internal functions like _Isinf or _Isnan

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