Make Vector and Region constexpr

[Matt Williams]

There are times where the size of Vectors or Regions are used to iterate over loops. In those cases, having the option to make them constexpr can allow the compiler to unroll the loops etc.

Worth looking into anyway.

[David Williams]

You can consider deferring this to 0.4 if you think dropping VS2008 support will help?

[Matt Williams]

Well constexpr still isn't in even as of the latest 2013 preview so it won't help but I think it makes sense to defer it for now. It isn't a priority.