The following short program works fine for VC7.1, but for several well regarded compilers including Intel-8/9 and gcc-3.4 fails to compile due to "ambiguous overload" errors. It's causing errors in the TR1/Bind concept tests, and I'd like to figure out if it's the compiler or Boost.Bind that's at fault so I can file defect reports with the compiler vendors if necessary. Here's the test case: #include <boost/bind.hpp> template <class Functor> void consume(Functor f); double test_proc(int a, char b, long c) { return a+b+c; } struct from_double { from_double(double){} }; int main() { consume(boost::bind<double>(&test_proc, 0, 0, 0)); consume(boost::bind<float>(&test_proc, 0, 0, 0)); consume(boost::bind<long double>(&test_proc, 0, 0, 0)); consume(boost::bind<from_double>(&test_proc, 0, 0, 0)); } And a typical error message from Intel-9 is: $ icl -GX -c -Ic:\\data\\boost\\develop\\boost bind.cpp Intel(R) C++ Compiler for 32-bit applications, Version 9.0 Build 20050912Z Pa ckage ID: W_CC_C_9.0.024 Copyright (C) 1985-2005 Intel Corporation. All rights reserved. 30 DAY EVALUATION LICENSE bind.cpp bind.cpp(21): error: more than one instance of overloaded function "boost::bind" matches the argument list: function template "boost::bind<R,F,A1,A2,A3>(F, A1, A2, A3)" function template "boost::bind(R (*)(B1, B2, B3), A1, A2, A3)" argument types are: (double (*)(int, char, long), int, int, int) consume(boost::bind<double>(&test_proc, 0, 0, 0)); ^ compilation aborted for bind.cpp (code 2) Note that it's the presence of the function pointer overloads that causes the error: in other words it's an artefact of the implementation that causes the error, not the TR1 specification itself. Anyone any ideas whose at fault here? Thanks, John.