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#include <iostream>
 
class Foo
{
private:
	int m_data;
 
public:
	Foo(int data)
	: m_data(data)
	{
 
	}
 
	void operator=(const Foo& other)
	{
		m_data = other.m_data;
	}
 
	int GetData()
	{
		return m_data;
	}
};
 
int main() 
{
	auto a = Foo(42);
	auto b = Foo(24);
	auto c = Foo(10);
 
	a = b = c;
 
	std::cout << &a << ": " << a.GetData() << std::endl;
	std::cout << &b << ": " << b.GetData() << std::endl;
	std::cout << &c << ": " << c.GetData() << std::endl;
 
	return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:32:4: error: no match for 'operator=' (operand types are 'Foo' and 'void')
  a = b = c;
    ^
prog.cpp:15:7: note: candidate: void Foo::operator=(const Foo&)
  void operator=(const Foo& other)
       ^
prog.cpp:15:7: note:   no known conversion for argument 1 from 'void' to 'const Foo&'

Standard output is empty