02-move.cpp
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#include <iostream>
#include <memory>
class Example {
public:
int *val;
Example(Example &&rhs) : val(rhs.val) {
rhs.val = nullptr;
std::cout << "Example::Example(Example &&)" << std::endl;
}
Example &operator=(Example &&rhs) // buggy
{
if (&rhs == this)
return *this;
val = rhs.val;
rhs.val = nullptr;
std::cout << "Example::operator=(Example &&)" << std::endl;
return *this;
}
Example() : val(new int(0)) {
std::cout << "Example::Example()" << std::endl;
}
Example(int a) : val(new int(a)) {
std::cout << "Example::Example(" << a << ")" << std::endl;
}
~Example() {
delete val;
std::cout << "Example::~Example()" << std::endl;
}
};
int main() {
Example a(3);
Example b = std::move(a);
Example c(Example(4));
Example d;
d = std::move(b);
}