![]() ![]() This mapping occurs only in debug builds, which have _DEBUG. Including crtdbg.h maps the malloc and free functions to their debug versions, _malloc_dbg and _free_dbg, which track memory allocation and deallocation. If you leave out the #define statement, the memory leak dump will be less detailed. The #define statement maps a base version of the CRT heap functions to the corresponding debug version. ![]() To enable all the debug heap functions, include the following statements in your C++ program, in the following order: #define _CRTDBG_MAP_ALLOC ![]() The primary tools for detecting memory leaks are the C/C++ debugger and the C Run-time Library (CRT) debug heap functions. The Visual Studio debugger and C Run-time Library (CRT) can help you detect and identify memory leaks. Even harmless memory leaks might indicate other problems that should be corrected. A leaking app that uses up all available memory can cause other apps to crash, creating confusion as to which app is responsible. A small memory leak might not be noticed at first, but over time can cause symptoms ranging from poor performance to crashing when the app runs out of memory. Memory leaks result from the failure to correctly deallocate memory that was previously allocated. Memory leaks are among the most subtle and hard-to-detect bugs in C/C++ apps. ![]()
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