GCD relies on Blocks (closures) for ergonomics, and Blocks have been proposed to WG14, for example N1451: http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1451.

GCD relies on Blocks (closures) for ergonomics, and Blocks have been proposed to WG14, for example N1451: http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1451.pdf http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1451.pdf