c++ - "no operator "!=" matches these operands" for Iterator comparison after migration to VS2015 -

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i upgrading vc++6 project vs2015. have if statement checking iterator against being null (actually 0). code building in vc++6 , vs2003 without error in vs2015 throws error. here code:

here type definitions:

#define null    0      typedef std::list <bsctrk *> bsctl; typedef bsctl::iterator bsctli;     // data type of iterator trunk linked list  typedef struct   {   int   tsnum;                     bsctli    tli;        // iterator of trunk reset  } tnkreset; extern tnkreset gtnkreset;

here piece code throwing error in vs2015:

if (gtnkreset.tli != null)         resetradtnk (gtnkreset.tli);

error:

severity code description project file line column suppression state detail description error (active) no operator "!=" matches these operands bscc operand types are: bsctli != int

i have tried nullptr didn't help.what problem here?

you should never compare iterators else other iterators same container. proper way initialize "empty" iterator give value of end() container.

std::list<int> list; auto itor = list.end();  // ...  if (itor == list.end())    // itor not pointing anywhere interesting

as why you're having error 2015, not 2003 or (gasp!) 6.0, implementation of iterators in visual c++'s standard library has changed on time. might have had constructor taking pointer or weird operator==, knows.


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