AfxDebugBreak (Debugging)
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MFC provides a special AfxDebugBreak function for hard-coding breakpoints in source code:
AfxDebugBreak( );
On Intel platforms, AfxDebugBreak produces the following code, which breaks in source code rather than kernel code:
_asm int 3
On other platforms, AfxDebugBreak merely calls DebugBreak.
Be sure to remove AfxDebugBreak statements when you create a release build or use #ifdef _DEBUG to surround them.