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Message: [QUOTE="Jeff Schwab, post: 3451700"] The proposal: [URL]http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2215.pdf[/URL] I didn't know about that. Very neat. I'm not thrilled with g++ warning me about: std::tr1::array<int, 42> = { 0 }; // g++ wants { { 0 } } It would bother me less if there were consistent syntax for primitive and UD types. That's a very good point, and is the reason my "not really initialization" solutions are inferior. Is the key stored as a char const* so that construction of the initializers does not require any run-time overhead? Does MapInit count as a POD type, and is there benefit to using POD initializers? [/QUOTE]