CODEWITHSUNDEEP
pythonc++boost
kkprime
kkprime

Reputation: 138

python float to c++ double using BOOST

I am new to python c++ interface. I have a dictionary of list and float variables in a python file. Am extracting this python objects into c++ variables. Am able to extract the lists into the vector variables. but am unable to do the same for float type.

this is my dict in dict.py

ATM__INTERPOLATION_CUBE = {
   "xOrigin": xOrigin,

   "yOrigin": yOrigin,

    "zOrigin": zOrigin,

    "xEnd"   : xEnd,

    "yEnd"   : yEnd,

    "zEnd"   : zEnd,

    "point_xdensity":point_xdensity,

    "point_ydensity":point_ydensity,

    "point_zdensity":point_zdensity,

    "short_Space_x" : 0.25,

    "short_Space_y" : 0.25,

    "short_Space_z" : 0.25}

ATM__TYPE = "3D_CUBE"

In my c++ script, I create an object myconfig of python dict type.

python::dict myconfig = ctl->scanConfig("ATM__INTERPOLATION_CUBE", python::dict(), True);

then I create a python list and store each list into a new python list

>

python::list xOrigin_list(myconfig["xOrigin"]);
>python::list yOrigin_list(myconfig["yOrigin"]);

then I extract the python list into my c++ vector variable using loop

> for(init;condt;incr)
   > xOrigin.push_back(python::extract <double>(xOrigin_list[i]));
   > yOrigin.push_back(python::extract<double>(yOrigin_list[i]));

but the above procedure doesnt work for float or long :(

python::long short_Space_x_fl(myconfig["short_Space_x"]);

> short_Space_x = python::extract<double>(short_Space_x_fl);

it gives me an error. can someone please tell me how to extract the value of type float/long from python and store in c++ double variable?

var.cc:18:11: error: expected unqualified-id before ‘long’

thanks in advance

Upvotes: 2

Views: 1844

Answers (1)

kkprime
kkprime

Reputation: 138

Only when a list is to be extracted into a vector the above usage works. But for extracting a single data (int, float, long) the extraction syntax is straight forward,

double var_name = python::extract<double>(python_dict_obj["python_key"]);

this will store the float value in dictionary at the given key into the variable of c++

Upvotes: 2

Related Questions