Question

I have a problem with boost::program_options

i have a class

namespace po = boost::program_options;
class imageProcess{
private:
    po::options_description options;
public:
    imageProcess(int argc,char** argv){
        po::options_description desc("Allowed options");
        this->options = desc;

It gives me these errors:

non-static const member ‘const unsigned int
boost::program_options::options_description::m_min_description_length’,
can’t use default assignment operator imgproc line 163, external
location:
/usr/include/boost/program_options/options_description.hpp C/C++
Problem non-static const member ‘const unsigned int
boost::program_options::options_description::m_line_length’, can’t use
default assignment operator imgproc line 163, external location:
/usr/include/boost/program_options/options_description.hpp C/C++
Problem use of deleted function
‘boost::program_options::options_description&
boost::program_options::options_description::operator=(const
boost::program_options::options_description&)’ imageProcess.cpp /imgproc/src line
20 C/C++ Problem

What should i do to make options field instance of po::options_description?

EDIT:
I know options field is already an instance but is there a way to set the description “Allowed options” after defining this field(po::options_description options(“allowed options”); doesnt work too)? And how i should store previously created instances of object into class fields?

Answer 1

Read your errors:

non-static const member ‘const unsigned int boost::program_options::options_description::m_min_description_length’, can’t use default assignment operator

non-static const member ‘const unsigned int boost::program_options::options_description::m_line_length’, can’t use default assignment operator

use of deleted function ‘boost::program_options::options_description& boost::program_options::options_description::operator=(const boost::program_options::options_description&)’

They indicate that boost::program_options::options_description does not support the assignment operator operator= in your version of Boost (actually since v1.33), due to the const member within options_description.

You’ll have to — and anyway should — initialise your options_description instance using the ctor-initializer:

namespace po = boost::program_options;
class imageProcess{
private:
    po::options_description options;
public:
    imageProcess(int argc, char** argv);
};

imageProcess::imageProcess(int argc, char** argv)
   : options("Allowed options")
{}

The line starting : is where your constructor arguments for the member options go.