c++ - Can I convert a pointer to my class? -

i'm refactoring class project adapt int data. code quite complicated, try give simple example below:

struct {   a(int a):a_(a) {}  // supports implicit conversion int   int a_; };  void print(a a) { cout<<a.a_<<endl; }  void x2(a *a) {   // change a's value   a->a_ *= 2; }  int main() {   int b = 2;   print(b);      // pass int without problem   x2(&b);        // pass int* a* - failed   cout<<b<<endl; // b supposed changed x2() } 

in case maybe template choice, i'm afraid rewritting whole class template huge effort , little harm readablity colleagues.

is there other way use "int*" "a*"?

no, there's no "way". trying here violating contract on x2, a valid pointer a.

the simplest change change x2 to: (there's no need use pointer here)

void x2 (a& a) {     a.a_ *= 2; } 

and call value that's wrapped around int (like @jrok suggested):

a a(2); x2(a); 

if conderned printing, provide operator<< a.