Hello, Could anyone please tell me why the following code fails to compile:

inline void rmfunc(std::list<boost::function<void()> >& funcs, boost::function<void()> f) { for (std::list<boost::function<void()> >::iterator i=funcs.begin(); i!=funcs.end(); ++i) { if (boost::function_equal(*i, *f)) i = funcs.erase(i); } }

while the following does compile:

template <typename T> inline void rmfunc(std::list<boost::function<void()> >& funcs, const T& f) { for (std::list<boost::function<void()> >::iterator i=funcs.begin(); i!=funcs.end(); ++i) { if (boost::function_equal(*i, f)) i = funcs.erase(i); } }

and seemingly equivalent code, placed in-line in the calling function, also compiles?

for (std::list<boost::function<void()> >::iterator i=funcs.begin(); i!=funcs.end(); ++i) { if (boost::function_equal(*i, boost::ref(bar))) i = funcs.erase(i); }

The full code for my test program (with the non-compiling function commented out) is attached. My compiler is gcc 4.1.1; I'm using the boost 1.33.1 package from Fedora Core 5. Thanks, Rennie deGraaf #include <list> #include <algorithm> #include <boost/ref.hpp> #include <boost/function.hpp> #include <iostream> struct Foo { void operator()() {} }; /*inline void rmfunc(std::list<boost::function<void()> >& funcs, boost::function<void()> f) { for (std::list<boost::function<void()> >::iterator i=funcs.begin(); i!=funcs.end(); ++i) { if (boost::function_equal(*i, f)) i = funcs.erase(i); } }*/ template <typename T> inline void rmfunc(std::list<boost::function<void()> >& funcs, const T& f) { for (std::list<boost::function<void()> >::iterator i=funcs.begin(); i!=funcs.end(); ++i) { if (boost::function_equal(*i, f)) i = funcs.erase(i); } } int main() { std::list<boost::function<void()> > funcs; Foo foo; Foo bar; funcs.push_back(boost::ref(foo)); funcs.push_back(boost::ref(bar)); std::cout << funcs.size() << std::endl; // should be 2 rmfunc(funcs, boost::ref(foo)); std::cout << funcs.size() << std::endl; // should be 1 for (std::list<boost::function<void()> >::iterator i=funcs.begin(); i!=funcs.end(); ++i) { if (boost::function_equal(*i, boost::ref(bar))) i = funcs.erase(i); } std::cout << funcs.size() << std::endl; // should be 0 return 0; }