isnan in C++ compilation

[Francisco Lahuerta Calahorra]

When cython is compile in C, in order to use isnan extern function I use the following

cdef extern from "math.h" nogil:
    bint isnan(DTYPE_t x)

however when the same code is compile in C++ with language='c++' in the setup script

I get the following error 

error: 'isnan' was not declared in this scope

how can I declare a new definition for isnan with C++ compilation

thanks

[Robert Bradshaw]

cdef extern from "<cmath>" namespace "std":
bint isnan(DTYPE_t x) nogil

[Francisco Lahuerta Calahorra]

That works, thanks

[Stefan Behnel]

Robert Bradshaw, 25.10.2013 07:00:

> On Thu, Oct 24, 2013 at 4:31 AM, Francisco Lahuerta Calahorra wrote:
>> When cython is compile in C, in order to use isnan extern function I use the
>> following
>>
>>> cdef extern from "math.h" nogil:
>>> bint isnan(DTYPE_t x)
>>
>>
>> however when the same code is compile in C++ with language='c++' in the
>> setup script
>> I get the following error
>>
>>> error: 'isnan' was not declared in this scope
>>
>>
>> how can I declare a new definition for isnan with C++ compilation
>
> cdef extern from "<cmath>" namespace "std":
> bint isnan(DTYPE_t x) nogil

Would it be worth adding this as

libcpp.cmath

.pxd module ?

Stefan

[Lisandro Dalcin]

What about all the others pxds in libc/* ? Too bad we cannot "include"
on a cdef block, this would let us easily expose all of libc in libcpp
without duplicating the declarations:

# libc/math.pxd

cdef extern from "math.h" nogil:

include "./math.pxd.in"

# libcpp/cmath.pxd
cdef extern from "cmath" namespace "std" nogil:
include "../libc/math.pxd.in"



--
Lisandro Dalcin
---------------
CIMEC (UNL/CONICET)
Predio CONICET-Santa Fe
Colectora RN 168 Km 472, Paraje El Pozo
3000 Santa Fe, Argentina
Tel: +54-342-4511594 (ext 1016)
Tel/Fax: +54-342-4511169