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Clang++ 3.2 on ArchLinux (i686) is used to build the following C++11 codes #include <iostream> #include <functional> typedef std::function<void ()> Action; typedef std::function<int ()> Generator; Action act(Generator const& gen) { return [=]() { std::cout << gen() << std::endl; }; } int main() { static Generator const gen([]() { return 0; }); act(gen); return 0; } With clang++ test.cpp -std=c++0x && valgrind --leak-check=full --log-file=tmp.log.memcheck ./a.out then I get ==600== HEAP SUMMARY: ==600== in use at exit: 1 bytes in 1 blocks ==600== total heap usage: 3 allocs, 2 frees, 18 bytes allocated ==600== ==600== 1 bytes in 1 blocks are definitely lost in loss record 1 of 1 ==600== at 0x402B124: operator new(unsigned int) (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so) ==600== by 0x8048D4F: std::_Function_base::_Base_manager<main::$_1>::_M_clone(std::_Any_data&, std::_Any_data const&, std::integral_constant<bool, false>) (in /home/neuront/a.out) ==600== by 0x8048C21: std::_Function_base::_Base_manager<main::$_1>::_M_manager(std::_Any_data&, std::_Any_data const&, std::_Manager_operation) (in /home/neuront/a.out) ==600== by 0x8049455: std::function<int ()>::function(std::function<int ()> const&) (in /home/neuront/a.out) ==600== by 0x8049283: std::function<int ()>::function(std::function<int ()> const&) (in /home/neuront/a.out) ==600== by 0x80489B1: act(std::function<int ()> const&) (in /home/neuront/a.out) ==600== by 0x8048A6C: main (in /home/neuront/a.out) ==600== ==600== LEAK SUMMARY: ==600== definitely lost: 1 bytes in 1 blocks ==600== indirectly lost: 0 bytes in 0 blocks ==600== possibly lost: 0 bytes in 0 blocks ==600== still reachable: 0 bytes in 0 blocks ==600== suppressed: 0 by

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