c++ - Undefined reference to a static member -


i'm using cross compiler. code is:

class windowstimer{ public:   windowstimer(){     _frequency.quadpart = 0ull;   }  private:   static large_integer _frequency; };

i following error:

undefined reference `windowstimer::_frequency'

i tried change to

large_integer _frequency.quadpart = 0ull;

or

static large_integer _frequency.quadpart = 0ull;

but i'm still getting errors.

anyone knows why?

you need define _frequency in .cpp file.

i.e.

large_integer windowstimer::_frequency;

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