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| // main.cpp (C++11 unique_ptr, shared_ptr, weak_ptr) | |
| // main code from http://www.gisdeveloper.co.kr/?p=2094 | |
| #include <memory> | |
| #include <iostream> | |
| using namespace std; | |
| void test_unique_ptr(); | |
| void test_unique_ptr2(); | |
| void test_shared_ptr(); | |
| void test_move(); | |
| void test_weak_ptr(); | |
| void test_shared_weak_ptr(); | |
| int main(int argc, char *argv[]) | |
| { | |
| test_unique_ptr(); | |
| test_unique_ptr2(); | |
| test_shared_ptr(); | |
| test_move(); | |
| test_weak_ptr(); | |
| test_shared_weak_ptr(); | |
| return 0; | |
| } | |
| void test_unique_ptr() | |
| { | |
| cout << __FUNCTION__ << endl; | |
| unique_ptr<int> p1(new int(10)); // making unique pointer | |
| cout << *p1 << endl; // 10 | |
| } | |
| void test_unique_ptr2() | |
| { | |
| cout << __FUNCTION__ << endl; | |
| unique_ptr<int> p1(new int(10)); | |
| cout << *p1 << endl; // 10 | |
| // sharing unique pointer. | |
| // unique_ptr<int> p2 = p1; // error: use of deleted function 'std::unique_ptr<_Tp, _Dp>::unique_ptr(const std::unique_ptr<_Tp, _Dp>&) [with _Tp = int; _Dp = std::default_delete<int>]' | |
| } | |
| void test_shared_ptr() | |
| { | |
| cout << __FUNCTION__ << endl; | |
| shared_ptr<int> p1(new int(10)); // making shared pointer | |
| shared_ptr<int> p2 = p1; // sharing shared pointer | |
| cout << *p1 << endl; // 10 | |
| cout << *p2 << endl; // 10 | |
| cout << p2.use_count() << endl; // 2 (it's a reference count) | |
| p1.reset(); | |
| cout << p2.use_count() << endl; // 1 | |
| p2.reset(); | |
| cout << p2.use_count() << endl; // 0 | |
| } | |
| void test_move() | |
| { | |
| cout << __FUNCTION__ << endl; | |
| unique_ptr<int> p1(new int(10)); // making unique pointer | |
| cout << *p1 << endl; // 10 | |
| unique_ptr<int> p3 = move(p1); // moving unique pointer (it is not sharing) | |
| // cout << *p1 << endl; | |
| cout << p1.get() << endl; // 0 | |
| cout << p3.get() << endl; // pointer | |
| } | |
| void test_weak_ptr() | |
| { | |
| cout << __FUNCTION__ << endl; | |
| shared_ptr<int> sp1(new int(10)); // making shared pointer | |
| weak_ptr<int> wp1 = sp1; // sharing weak pointer | |
| cout << sp1.use_count() << endl; // 1 | |
| cout << wp1.use_count() << endl; // 1 | |
| } | |
| void test_shared_weak_ptr() | |
| { | |
| cout << __FUNCTION__ << endl; | |
| shared_ptr<int> sp1(new int(10)); | |
| weak_ptr<int> wp1 = sp1; | |
| cout << sp1.use_count() << endl; // 1 | |
| cout << wp1.use_count() << endl; // 1 | |
| { | |
| shared_ptr<int> sp2 = wp1.lock(); | |
| cout << sp1.use_count() << endl; // 2 | |
| cout << wp1.use_count() << endl; // 2 | |
| } | |
| cout << sp1.use_count() << endl; // 1 | |
| cout << wp1.use_count() << endl; // 1 | |
| } |
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