clang-extensions

http://clang.llvm.org/docs/BlockLanguageSpec.txt Looks really cool. However, I don't understand it. I don't see examples it. I don't see examples of ideas hard to express in C++ as is, but trivial to express in blocks. Can anyone enlighten me on this? Blocks are, essentially, a way to pass code and scope around as data. They're known in some other languages as closures and anonymous functions. Here's an article with more details and code examples. NanoTech already linked to an explanation of blocks. As for how this relates to C++ let me state my personal opinion: This extension is not useful

I had always thought that variable length arrays were not allowed in c++(Refer : Why aren't variable-length arrays part of the C++ standard? ) .But than why does this code compile and work? #include <iostream> using namespace std; int main () { int n; cin >> n; int a[n]; for (int i=0; i<n; i++) { a[i] = i; } for (int i=0; i<n; i++) { cout << a[i] << endl; } } David Heffernan The current C++ standard does not require that compilers VLAs. However, compiler vendors are permitted to support VLAs as an extension. It was originally proposed that VLAs would appear in C++14, however the proposal did