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I was just playing around with the new std::function from C++11, and I wrote an example that compiles with clang++ 3.2 and the Intel C++ compiler 13.1 but not with g++ 4.8. Before I report this as a bug, I thought I'd check that I'm not doing something really stupid and that this should actually compile. So, is the following code valid c++11? template <typename C> void map(C& c, std::function<typename C::value_type(typename C::value_type)> f) { for(auto& x : c) { x = f(x); } } int main() { std::vector<int> v; v.push_back(1); v.push_back(2); v.push_back(3); map(v, [](int x) { return x+2; }); for(auto x : v) { std::cout << x << std::endl; } } I realise that this code isn't very useful but it struck me as odd that clang and Intel C++ compiled it and gcc didn't. EDIT: gcc will also not compile the same code when passing map a functor or function pointer: struct { int operator() (int a) { return a+2; } } add2s; map(v, add2s); int add2 (int a) { return a+2; } map(v,add2); clang and icpc also compile both of these.

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