How to resolve a name collision between a C++ namespace and a global function?

if I define a namespace `log` somewhere and make it accessible in the global scope, this will clash with `double log(double)` from the standard `cmath` header. Actually, most compilers seem to go along with it -- most versions of SunCC, MSVC, GCC -- but GCC 4.1.2 doesn't. Unfortunately, there seems no way to resolve the ambiguity, as `using` declarations are not legal for namespace identifiers. Do you know any way I could write `log::Log` in the global namespace even if `cmath` is included? Thanks. EDIT: Would anybody know what the C++03 standard has to say about this? I would have thought that the scope operator sufficiently disambiguates the use of `log` in the code example below. ``` #include <cmath> namespace foo { namespace log { struct Log { }; } // namespace log } // namespace foo using namespace foo; int main() { log::Log x; return 0; } // g++ (GCC) 4.1.2 20070115 (SUSE Linux) // log.cpp: In function `int main()': // log.cpp:20: error: reference to `log' is ambiguous // /usr/include/bits/mathcalls.h:110: error: candidates are: double log(double) // log.cpp:7: error: namespace foo::log { } // log.cpp:20: error: expected `;' before `x' ```