Does any compiler support constexpr yet?

Question

I want to play with constexpr, does any compiler support it yet?

Answer 1

The Apache Stdcxx project has a nice table detailing which C++0x features are supported by which compilers. It's been updated on a regular basis and covers most of the modern C++ compilers.

According to that, only GCC 4.5 supports constexpr (note that that support may be experimental).

Between that list and what has been said in the comments, it appears the answer is "no."

Answer 2

As of July 2011, gcc 4.7 supports constexpr. You need to build it from svn though.