typeconversionambiguity.cpp

来自「ThinkingC++中文版」· C++ 代码 · 共 35 行

//: C12:TypeConversionAmbiguity.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 2000
// Copyright notice in Copyright.txt
class Orange; // Class declaration

class Apple {
public:
  operator Orange() const; // Convert Apple to Orange
};


class Orange {
public:
	Orange(){}
    Orange(Apple) // Convert Apple to Orange
	{
	}
};

Apple::operator Orange() const
{
	return Orange();
}

void f(Orange) {}

int main() {
  Apple a;
  f(a); // Error: ambiguous conversion  Apple to Orangle have to ways:
 //(1)Apple::Orange()  (2)Orangle::Orangle(Apple)
} ///:~