test_bss.cxx

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#include <boost/signals2.hpp>
#include <iostream>

struct CountOutLoud
{
    int count;
    CountOutLoud(int c=0) : count(c) {}
    
    void operator()() {
        std::cout << "count: " << count << std::endl;
        ++count;
    }
};

int main()
{
    // Signal with no arguments and a void return value
    boost::signals2::signal<void ()> sig;

    CountOutLoud col;
    sig.connect(col);

    sig();
    sig();
    sig();
}