//
// 5.2.unique.ptr.cpp
// chapter 05 start pointers and memory management
// modern c++ tutorial
//
// created by changkun at changkun.de
// https://github.com/changkun/modern-cpp-tutorial
//
#include
#include
struct Foo {
Foo() { std::cout << "Foo::Foo" << std::endl; }
~Foo() { std::cout << "Foo::~Foo" << std::endl; }
void foo() { std::cout << "Foo::foo" << std::endl; }
};
void f(const Foo &) {
std::cout << "f(const Foo&)" << std::endl;
}
int main() {
std::unique_ptr p1(std::make_unique());
// p1 is not empty, prints
if (p1) p1->foo();
{
std::unique_ptr p2(std::move(p1));
// p2 is not empty, prints
f(*p2);
// p2 is not empty, prints
if(p2) p2->foo();
// p1 is empty, no prints
if(p1) p1->foo();
p1 = std::move(p2);
// p2 is empty, no prints
if(p2) p2->foo();
std::cout << "p2 was destroied" << std::endl;
}
// p1 is not empty, prints
if (p1) p1->foo();
// Foo instance will be destroied when leaving the scope
}