due to MS platform WIN64 have sizeof(long)!=sizeof(void)
( see http://fltk.org/str.php?L2308 )
we can change long to intptr_t in callback functions or write
smth like this.
long argument() const {return (long)(intptr_t)user_data_;}
i have worked patch for current svn with conversions like
(long)(intptr_t)user_data_.
i can commit it. but it seems not very good to write many conversions.
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