Mat, Mat Marcus wrote:
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In one of our projects, the following code produces some strange compilation errors under VC 7.1/boost 1.33.0. Can anyone suggest a workaround?
- Mat
#include <sstream> #include "boost/type_traits.hpp" #include "boost/utility/enable_if.hpp"
template <typename EnumType> typename boost::enable_if<boost::is_enum<EnumType>, EnumType>::type operator ~ (EnumType a);
I can't say whether that is your problem, but code like this is potentially dangerous. It'll break whenever you happen to "suck" in a use of operator~ on an unnamed enum. And yes it tends to generate weird error messages. Looking at the errors the unknown type in the is_enum instantiation looks suspicious to me. I only have apples gcc 4 currently. A slightly modified example gives this: enum { foo, bar }; template <typename EnumType> typename boost::enable_if<boost::is_enum<EnumType>, EnumType>::type operator ~ (EnumType a); int main() { int i = ~bar; std::stringstream t; } mat.cpp: In function 'int main()': mat.cpp:14: error: '<anonymous enum>' is/uses anonymous type mat.cpp:14: error: trying to instantiate 'template<class T> struct boost::is_enum' Thomas
std::stringstream t;
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