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support for boost::python for build double object

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  support for boost::python for build double object Joseph Shen <joseph.smeng@gmail.com> - 2014-11-03 05:53 -0800
    Re: support for boost::python for build double object Skip Montanaro <skip.montanaro@gmail.com> - 2014-11-03 08:10 -0600
      Re: support for boost::python for build double object Joseph Shen <joseph.smeng@gmail.com> - 2014-11-03 06:39 -0800
    Re: support for boost::python for build double object Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-11-03 15:02 +0000

#80154 — support for boost::python for build double object

In the boost::python library there is a function

>>> boost::python::long_

and this function return a boost::python::object variable

I'm trying to wrap a double variale but I can't find 
something just like

>>  boost::python::double_

can someone help me to build a double object 

PS.
I know there are some functions in pure python c api like 

>> PyFloat_FromDouble

and after create the object I can wrap it in boost::python::object

but all I want is same api from boost::python library

I can't find what I want

tanks.

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#80155

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On Mon, Nov 3, 2014 at 7:53 AM, Joseph Shen <joseph.smeng@gmail.com> wrote:

> In the boost::python library there is a function
>
> >>> boost::python::long_
>
> and this function return a boost::python::object variable
>
> I'm trying to wrap a double variable but I can't find
> something just like
>
> >>  boost::python::double_
>
> can someone help me to build a double object
>

Is there a boost::python::float_ function? If so, does it produce a 32-bit
(C float) or 64-bit (C double) number?

Skip

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#80156

On Monday, November 3, 2014 10:11:01 PM UTC+8, Skip Montanaro wrote:
> On Mon, Nov 3, 2014 at 7:53 AM, Joseph Shen <joseph...@gmail.com> wrote:
> 
> In the boost::python library there is a function
> 
> 
> 
> >>> boost::python::long_
> 
> 
> 
> and this function return a boost::python::object variable
> 
> 
> 
> I'm trying to wrap a double variable but I can't find
> 
> something just like
> 
> 
> 
> >>  boost::python::double_
> 
> 
> 
> can someone help me to build a double object
> Is there a boost::python::float_ function? If so, does it produce a 32-bit (C float) or 64-bit (C double) number?
> 
> 
> Skip

thanks for reply,

no there is no such function like float_ or double_ or float32_ etc.

I'm reading the boost source code right now to find something

wish me good luck

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#80158

On 03/11/2014 13:53, Joseph Shen wrote:
> In the boost::python library there is a function
>
>>>> boost::python::long_
>
> and this function return a boost::python::object variable
>
> I'm trying to wrap a double variale but I can't find
> something just like
>
>>>   boost::python::double_
>
> can someone help me to build a double object
>
> PS.
> I know there are some functions in pure python c api like
>
>>> PyFloat_FromDouble
>
> and after create the object I can wrap it in boost::python::object
>
> but all I want is same api from boost::python library
>
> I can't find what I want
>
> tanks.
>

I'm sorry that I can't help directly but try here 
https://mail.python.org/mailman/listinfo/cplusplus-sig which is also 
available as gmane.comp.python.c++

-- 
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.

Mark Lawrence

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