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From: Michael Goldshteyn (mgoldshteyn_at_[hidden])
Date: 2008-07-14 17:27:04
Sorry, post got garbled, here it is again:
#include <boost/bind.hpp>
#include <boost/ref.hpp>
#include <string>
// Define a simple class for our example class Crayon {
public:
explicit Crayon(const std::string &color=std::string()):m_color(color) {}
const std::string &GetColor() const {return m_color;}
private:
std::string m_color;
};
int main(int argc, char *argv[])
{
using namespace std;
using namespace boost;
Crayon cr("blue");
boost::reference_wrapper<const Crayon> crefCr(cr);
// This compiles
std::string color(boost::bind(&Crayon::GetColor,_1)(cr));
// This also compiles, using an explicit get on crefCr
std::string
colorFromConstRef(boost::bind(&Crayon::GetColor,boost::bind(&boost::referenc
e_wrapper<const Crayon>::get,_1))(crefCr));
// This doesn't compile, however, even though the reference_wrapper class
template has
// an overloaded operator T& () const function
std::string colorFromConstRef2(boost::bind(&Crayon::GetColor,_1)(crefCr));
}
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