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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. struct From;
  5.  
  6. struct By{
  7.     By(const From& f){}
  8. };
  9.  
  10. struct From{
  11.     int i;
  12.     From(){}
  13.     //operator By() {}
  14. };
  15.  
  16. struct To{
  17.     To(const By& b){}
  18. };
  19.  
  20. int main() {
  21.     From f;
  22.     To to {f};  // works w/o conversion operator
  23.     //To to = f;  // error: conversion from 'From' to non-scalar type 'To' requested
  24.     return 0;
  25. }
Success #stdin #stdout 0s 3136KB
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https://ideone.com/vyz2VA
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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