在程式測驗程序中，發現有記憶體泄漏，通過valgrind定位，發現是CMapStringToPtr.SetAt使用時造成的記憶體泄漏，他底層好像呼叫的是CString類。請問有誰知道到CMapStringToPtr.SetAt底層的作業原理或者代碼嗎。或者解決記憶體泄漏的辦法，謝謝大家。以下是valgtind的日志。
==20058== 290 bytes in 20 blocks are definitely lost in loss record 1 of 1
==20058== at 0x40288F6: operator new[](unsigned int) (vg_replace_malloc.c:357)
==20058== by 0x804C46F: CString::AllocBuffer(int) (in /root/valgrind/SsiMemoryTest.exe)
==20058== by 0x804C753: CString::AllocBeforeWrite(int) (in /root/valgrind/SsiMemoryTest.exe)
==20058== by 0x804C89D: CString::AssignCopy(int, char const*) (in /root/valgrind/SsiMemoryTest.exe)
==20058== by 0x804CA7A: CString::operator=(char const*) (in /root/valgrind/SsiMemoryTest.exe)
==20058== by 0x804AE6C: CMapStringToPtr::SetAt(char const*, void*) (in /root/valgrind/SsiMemoryTest.exe)
==20058== by 0x8049440: main (SsiMemoryTest.cpp:25)
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