const つけた

functiontest.cpp

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



class Test
{
public:
    explicit Test(const int x): v(x)
    {}

    int add(const int x) const
    {
        return this->v + x;
    }

    int operator ()(const int x, const int y) const
    {
        return this->v + x + y;
    }

private:
    const int v;
};


int add(const int x, const int y)
{
    return x + y;
}


int main(const int argc, const char* const args[])
{
    const auto x = boost::function<int(const int, const int)>(add);
    const auto y = boost::function<int(const Test&, const int)>(&Test::add);
    const auto z = boost::function<int(const int, const int)>(Test(10));

    std::cout << sizeof(x) << std::endl;
    std::cout << sizeof(y) << std::endl;
    std::cout << sizeof(z) << std::endl;

    std::cout << x(10, 20) << std::endl;
    std::cout << y(Test(10), 20) << std::endl;
    std::cout << z(10, 20) << std::endl;

    return 0;
}