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The "C++0xCompilerSupport" page has been changed by SethCantrell: http://wiki.apache.org/stdcxx/C%2B%2B0xCompilerSupport?action=diff&rev1=85&rev2=86 Comment: neither gcc 4.5. nor clang 3.1 implement constexpr. currently it's treated just like const ||<style="text-align:left;">`auto` ||v0.9: [[http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1984.pdf|N1984]], v1.0: [[http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2546.htm|N2546]] || ||4.1(v0.9) ||4.4(v1.0) ||11.0(v0.9) ||10.0(v0.9) ||11.1 (V1.0) || || || ||Yes || ||<style="text-align:left;">C99 preprocessor ||[[http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1653.htm|N1653]] || || ||4.3 ||11.1 || ||10.1 ||5.9 || ||Yes ||Yes || ||<rowbgcolor="lightgray"style="text-align:left;">''Concepts ^[removed]^'' ||[[http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2617.pdf|N2617]] || || ||ConceptGcc ||<<BR>> || || || || || || || - ||<style="text-align:left;">`constexpr` ||[[http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2235.pdf|N2235]] || || ||4.5 ||<<BR>> || || || || || ||3.1|| + ||<style="text-align:left;">`constexpr` ||[[http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2235.pdf|N2235]] || || || ||<<BR>> || || || || || || || ||<style="text-align:left;">`decltype` ||v1.0: [[http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2343.pdf|N2343]], v1.1: [[http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3276.pdf|N3276]] || ||4.1(v1.0) ||4.3(v1.0) ||11.0(v1.0) ||10.0(v1.0), 11.0(v1.1) ||11.1 (V1.0) || ||Yes || ||2.9 || ||<style="text-align:left;">Defaulted And Deleted Functions ||[[http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm|N2346]] || ||4.1 ||4.4 ||12.0 || || || || || ||3.0 || ||<style="text-align:left;">Delegating Constructors ||[[http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1986.pdf|N1986]] || || ||4.7 ||<<BR>> || ||11.1 || || || ||3.0 ||
