I was pretty surprised when I found that the following code actually works:

std::vector<int> list /*= ...*/;
std::tr1::function<void(int)> func = ^(int i) {
  return i + 1;
};

std::for_each(list.begin(), list.end(), func);

Seems like std::tr1::function is capable of being constructed from an Objective-C block, but I'm not sure quite how, since (last I checked), its implementation doesn't specifically handle blocks. Is it somehow implicitly sucking out the underlying function pointer? Also, is this behavior undefined and likely to change?

c++ objective-c++ objective-c-blocks
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