나는 다음과 같은 코드의 작은 조각을 썼다 : T는 [INT] 또는 [푸] 인 경우C++ 메모리 오류 사용의 malloc 표준에/realloc을/무료 : 문자열
template <class T>
void
test()
{
T* ptr = nullptr;
ptr = (T*)malloc(1 * sizeof(T));
new ((void*)ptr) T(T());
ptr = (T*)realloc(ptr, 2 * sizeof(T));
new ((void*)(ptr + 1)) T(T());
(ptr)->~T();
(ptr + 1)->~T();
free(ptr);
}
struct foo
{
foo() : ptr(malloc(10)) {}
~foo() { free(ptr); }
void* ptr;
};
int
main()
{
test<int>(); // this is ok
test<foo>(); // this is ok
test<std::string>(); // memory error :(
return 0;
};
은 모든 것이 잘 작동합니다. [푸] 또한 모두의 ctor에서의 malloc/무료 [표준 : : 문자열] 동안 메모리 문제로 연결 왜에만
==18184== Memcheck, a memory error detector
==18184== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==18184== Using Valgrind-3.12.0 and LibVEX; rerun with -h for copyright info
==18184== Command: ./a.out
==18184==
==18184== Invalid free()/delete/delete[]/realloc()
==18184== at 0x4C2C20A: operator delete(void*) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==18184== by 0x401074: void test<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >() (tmp.cpp:26)
==18184== by 0x400CFC: main (tmp.cpp:44)
==18184== Address 0x5a89e70 is 16 bytes inside a block of size 32 free'd
==18184== at 0x4C2CC37: realloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==18184== by 0x401042: void test<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >() (tmp.cpp:22)
==18184== by 0x400CFC: main (tmp.cpp:44)
==18184== Block was alloc'd at
==18184== at 0x4C2AB8D: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==18184== by 0x40100F: void test<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >() (tmp.cpp:18)
==18184== by 0x400CFC: main (tmp.cpp:44)
==18184==
==18184==
==18184== HEAP SUMMARY:
==18184== in use at exit: 0 bytes in 0 blocks
==18184== total heap usage: 9 allocs, 10 frees, 72,856 bytes allocated
==18184==
==18184== All heap blocks were freed -- no leaks are possible
==18184==
==18184== For counts of detected and suppressed errors, rerun with: -v
==18184== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
있다
: 그러나 [표준 : : 문자열] T는 다음과 같이 메모리 오류를보고 Valgrind의 원인으로를 사용하여 & dtor?나는 ++ 3.12.0