In another thread I introduced some techniques we would use for Model-Driven-Development in C++ once C++11 features, in particular user-defined literals, are available. I just revised the plans for GCC 4.5 and even 4.6 and it shows that this particular feature is not supported.
Anyway, do you know if I even have any compiler to test that feature to start designing/implementing the algorithms till the C++11 is approved and implemented in mainstream free compilers (LLVM, GCC)?
Not yet, although patches for both Clang and GCC have been submitted and rejected for reworking, so you should see something soon.