c++boostapply-visitor

How to convert boost::Makevariantover to vector


I have a boost::makevariantover. How can I convert that to a vector . Any samples will be helpful using boost::apply_visitor

class pixel_visitor
    : public boost::static_visitor<>
{

public:

template <typename T>
    void operator() (const ome::compat::shared_ptr<PixelBuffer<T> >& v)
    {
      std::cout << std::real(v);
    }    
};

pixelBuffer test= buf.vbuffer();    
test.apply_visitor(&pixel_visitor());

where

typedef boost::make_variant_over<pixel_buffer_types>::type     pixelBuffer;

Solution

  • We don't know what your pixelbuffer types are.

    Regardless, if you know how to convert those to vectors, you could simply return that from the visitor's call operator:

    class pixel_visitor
        : public boost::static_visitor<std::vector<WhatEverYouWant> >
    {
    
    public:
    
    template <typename T>
        result_type operator() (const ome::compat::shared_ptr<PixelBuffer<T> >& v)
        {
             std::vector<WhatEverYouWant> result;
             // do your conversion here
             return result;
        }    
    };
    

    So you can e.g.

    std::vector<WhatEverYouWant> applied;
    
    applied = boost_apply_visitor(pixel_visitor(), test);