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118 lines
2.6 KiB
118 lines
2.6 KiB
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#include <memory>
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#include <type_traits>
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class C {
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protected:
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struct Protected {
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private:
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Protected() {};
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public:
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static Protected make() { return { }; }
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};
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int m_x;
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private:
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struct Private {
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private:
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Private() {};
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public:
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static Private make() { return { }; }
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};
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int m_y;
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public:
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/* private constructor: */
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C(Private, int x, int y) : m_x(x), m_y(y) { }
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/* protected constructor: */
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C(Protected, int x) : C(Private::make(), x, 2*x) { }
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void leak_private_type(Private) { }
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static std::unique_ptr<C> Create(int x) {
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return std::unique_ptr<C>(new C(Private::make(), x, 2*x));
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}
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};
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class D : public C {
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private:
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struct Private { };
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public:
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D(Private&, int x) : C(Protected::make(), x) { }
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static std::shared_ptr<D> Create(int x) {
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Private p;
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return std::make_shared<D>(p, 4*x);
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}
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};
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class A {
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struct this_is_private {
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};
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public:
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explicit A(const this_is_private &, int) {}
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static ::std::shared_ptr<A> create(int x) {
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return ::std::make_shared<A>(this_is_private{}, x);
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}
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protected:
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A(const A &) = delete;
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const A &operator =(const A &) = delete;
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};
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::std::shared_ptr<A> foo(int x)
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{
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return A::create(x);
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}
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/* usage: decltype(return_args(&Class::memberfunction)) */
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template<typename Base, typename Result, typename... Args>
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std::tuple<Args...> return_args(Result (Base::*func)(Args...));
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/* usage: decltype(result_of(&Class::memberfunction)) */
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template<typename Base, typename Result, typename... Args>
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Result result_of(Result (Base::*func)(Args...));
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/* usage: decay_tuple_element<0, decltype(return_args(&Class::memberfunction))> */
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template <size_t i, typename Tuple>
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using decay_tuple_element = typename std::decay<typename std::tuple_element<i, Tuple>::type>::type;
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struct _is_static_castable_impl
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{
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template<typename _From, typename _To, typename = decltype(static_cast<_To>(std::declval<_From>()))>
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static std::true_type __test(int);
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template<typename, typename>
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static std::false_type __test(...);
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};
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template<typename _From, typename _To>
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struct is_static_castable
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: public _is_static_castable_impl
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{
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typedef decltype(__test<_From, _To>(0)) type;
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};
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template<typename _From, typename _To>
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using is_static_castable_t = typename is_static_castable<_From, _To>::type;
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int main() {
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auto c = C::Create(0);
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auto d = D::Create(0);
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typedef decay_tuple_element<0, decltype(return_args(&C::leak_private_type))> Private;
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Private::make();
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auto a1 = foo(0);
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auto a2 = std::shared_ptr<A>(new A({}, 0));
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// C c1({}, 0, 0);
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}
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