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  1. #include <iostream>
  2.  
  3. struct B;
  4.  
  5. struct A
  6. {
  7.   operator B();  
  8. };
  9.  
  10. struct B
  11. {
  12.     B(A  &) { std::cout << "conversion constructor" << std::endl; }
  13. };
  14.  
  15. A::operator B() { std::cout << "conversion operator" << std::endl; }
  16.  
  17. int main() 
  18. {
  19.     A a;
  20.     B b = a;
  21.     return 0;
  22. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In function ‘int main()’:
prog.cpp:20: error: conversion from ‘A’ to ‘B’ is ambiguous
prog.cpp:15: note: candidates are: A::operator B()
prog.cpp:12: note:                 B::B(A&)
stdout
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Standard output is empty
https://ideone.com/Z8WqtR
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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