asio_test.cpp

#include <iostream>

#include <boost/asio.hpp>

class Contextable {
public:
    Contextable(boost::asio::io_context& ctx) : m_ioContext(ctx) {}
protected:
    boost::asio::io_context& m_ioContext;
};

class Consumer : public Contextable{
public:
    Consumer(boost::asio::io_context& ctx) : Contextable(ctx) {}

    void completion(std::string str) {
        std::cout << "Received " << str << std::endl;
    }
};

int main() {
    boost::asio::io_context ctx;
    Consumer c(ctx);
    ctx.post([&]() { c.completion("foo"); });
    ctx.run();
    return 0;
}