I have some code that uses pointers to member functions (not boost.function). It compiles and works fine. But when I tried to convert the code to use boost.function, I got a mess of errors. I know I'm doing something wrong, but I have no idea what it is. A clue would be greatly appreciated. Here's a reduced test case. #include struct X { double f(double x) { return x; } double g(double x) { return -x; } //typedef boost::function ftype; typedef double (X::*ftype)(double); double call(ftype func, double x) { //return func(x); return (this->*func)(x); } }; int main(int argc, char *argv[]) { X x; x.call(&X::f, 1.0); // Error occurs here x.call(&X::g, 2.0); } It compiles as it appears above, but if I switch the typedef and return statements to their commented versions, I get the following errors: if g++ -DHAVE_CONFIG_H -I. -I/home/kohler/Projects/test/trunk/src -I.. -O0 -Wall -g3 -MT test.0 -MD -MP -MF ".deps/test.Tpo" -c -o test.o /home/kohler/Projects/test/trunk/src/test.cpp; then mv -f ".deps/test.Tpo" ".deps/test.Po"; else rm -f ".deps/test.Tpo"; exit 1; fi /usr/include/boost/function/function_template.hpp: In static member function 'static R boost::detail::function::function_obj_invoker1::invoke(boost::detail::function::function_buffer&, T0) [with FunctionObj = boost::_mfi::mf1, R = double, T0 = double]': /usr/include/boost/function/function_template.hpp:368: instantiated from 'void boost::detail::function::basic_vtable1::init(FunctionObj, boost::detail::function::function_obj_tag) [with FunctionObj = boost::_mfi::mf1, R = double, T0 = double, Allocator = std::allocator<void>]' /usr/include/boost/function/function_template.hpp:298: instantiated from 'void boost::detail::function::basic_vtable1::init(F) [with F = boost::_mfi::mf1, R = double, T0 = double, Allocator = std::allocator<void>]' /usr/include/boost/function/function_template.hpp:339: instantiated from 'void boost::detail::function::basic_vtable1::init(MemberPtr, boost::detail::function::member_ptr_tag) [with MemberPtr = double (X::*)(double), R = double, T0 = double, Allocator = std::allocator<void>]' /usr/include/boost/function/function_template.hpp:298: instantiated from 'void boost::detail::function::basic_vtable1::init(F) [with F = double (X::*)(double), R = double, T0 = double, Allocator = std::allocator<void>]' /usr/include/boost/function/function_template.hpp:277: instantiated from 'boost::detail::function::basic_vtable1::basic_vtable1(F) [with F = double (X::*)(double), R = double, T0 = double, Allocator = std::allocator<void>]' /usr/include/boost/function/function_template.hpp:655: instantiated from 'void boost::function1::assign_to(Functor) [with Functor = double (X::*)(double), R = double, T0 = double, Allocator = std::allocator<void>]' /usr/include/boost/function/function_template.hpp:513: instantiated from 'boost::function1::function1(Functor, typename boost::enable_if_c::value, int>::type) [with Functor = double (X::*)(double), R = double, T0 = double, Allocator = std::allocator<void>]' /usr/include/boost/function/function_template.hpp:753: instantiated from 'boost::function::function(Functor, typename boost::enable_if_c::value, int>::type) [with Functor = double (X::*)(double), R = double, T0 = double, Allocator = std::allocator<void>]' /home/kohler/Projects/test/trunk/src/test.cpp:21: instantiated from here /usr/include/boost/function/function_template.hpp:134: error: no match for call to '(boost::_mfi::mf1) (double&)' /usr/include/boost/bind/mem_fn_template.hpp:160: note: candidates are: R boost::_mfi::mf1::operator()(T*, A1) const [with R = double, T = X, A1 = double] /usr/include/boost/bind/mem_fn_template.hpp:179: note: R boost::_mfi::mf1::operator()(T&, A1) const [with R = double, T = X, A1 = double] g++ -v Using built-in specs. Target: i486-linux-gnu Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.2 --program-suffix=-4.2 --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-mpfr --enable-targets=all --enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu Thread model: posix gcc version 4.2.3 (Ubuntu 4.2.3-2ubuntu7)