Any implementations of C++0x out there?

Other than开发者_如何学运维 Microsoft's upcoming VC10?

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here is a good breakdown of c++0x support in several major compilers

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You can run g++ -std=c++0x for mostly-compatible C++0x implementation.

From the manual:

 c++0x
   The working draft of the upcoming ISO C++0x standard. This option enables experimental features that are
   likely to be included in C++0x. The working draft is constantly changing, and any feature that is enabled
   by this flag may be removed from future versions of GCC if it is not part of the C++0x standard.

As a stupid little example of it in action:

$ cat a.cpp    
const int FOO_VERSION = 2;

int main() {
    static_assert(FOO_VERSION >= 3, "Your version of Foo doesn't contain the necessary bugfixes to run this program correctly.");
    return 0;
}

$ g++ -std=c++0x a.cpp
a.cpp:1:17: error: stdio: No such file or directory
a.cpp: In function ‘int main()’:
a.cpp:6: error: static assertion failed: "Your version of Foo doesn\'t contain the necessary bugfixes to run this program correctly."

Also, as @GMan mentioned in a comment, GCC's list of C++0x compatibility can be found online.

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Comeau -- try it out here. And no, I don't work for/affiliated with them ;) But they do a good job of compliance.

Intel also supports some C++0x starting with 11.0. (The current version is 11.1)