The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.
We recommend using Visual Studio 2017



Assists in finding memory leaks.

#define new DEBUG_NEW 

You can use DEBUG_NEW everywhere in your program that you would ordinarily use the new operator to allocate heap storage.

In debug mode (when the _DEBUG symbol is defined), DEBUG_NEW keeps track of the filename and line number for each object that it allocates. Then, when you use the CMemoryState::DumpAllObjectsSince member function, each object allocated with DEBUG_NEW is shown with the filename and line number where it was allocated.

To use DEBUG_NEW, insert the following directive into your source files:

#define new DEBUG_NEW

Once you insert this directive, the preprocessor will insert DEBUG_NEW wherever you use new, and MFC does the rest. When you compile a release version of your program, DEBUG_NEW resolves to a simple new operation, and the filename and line number information are not generated.


In previous versions of MFC (4.1 and earlier) you needed to put the #define statement after all statements that called the IMPLEMENT_DYNCREATE or IMPLEMENT_SERIAL macros. This is no longer necessary.


Header: afx.h