ArchLinux (i686) 上的 Clang++ 3.2 用于构建以下 C++11 代码
#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;
}
clang++ test.cpp -std=c++0x && valgrind --leak-check=full --log-file=tmp.log.memcheck ./a.out
然后我得到
==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 bytes in 0 blocks
==600==
==600== For counts of detected and suppressed errors, rerun with: -v
==600== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
我不确定该代码是否有任何问题(并且只导致一个字节泄漏),但如果使用 g++ 4.7 编译,则不会有内存泄漏。对此有何建议?