cmemleak traces malloc() and free()

http://www.flipcode.com/archives/How_To_Find_Memory_Leaks.shtml is a dated (2000) but readable and detailed treatment

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VisualStudio offers
_CrtSetDbgFlag ( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF ); // I guess there’s no such thing in Linux