123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158 |
- /*
- Copyright 2017-2018 Glen Joseph Fernandes
- (glenjofe@gmail.com)
- Distributed under the Boost Software License, Version 1.0.
- (http://www.boost.org/LICENSE_1_0.txt)
- */
- #include <boost/core/pointer_traits.hpp>
- #include <boost/core/lightweight_test.hpp>
- template<class T>
- class P1 {
- public:
- explicit P1(T* p)
- : p_(p) { }
- T* operator->() const BOOST_NOEXCEPT {
- return p_;
- }
- private:
- T* p_;
- };
- template<class T>
- class P2 {
- public:
- explicit P2(T* p)
- : p_(p) { }
- P1<T> operator->() const BOOST_NOEXCEPT {
- return p_;
- }
- private:
- P1<T> p_;
- };
- #if !defined(BOOST_NO_CXX14_RETURN_TYPE_DEDUCTION)
- template<class T>
- class P3 {
- public:
- explicit P3(T* p)
- : p_(p) { }
- T* get() const BOOST_NOEXCEPT {
- return p_;
- }
- private:
- T* p_;
- };
- namespace boost {
- template<class T>
- struct pointer_traits<P3<T> > {
- static T* to_address(const P3<T>& p) BOOST_NOEXCEPT {
- return p.get();
- }
- };
- } /* boost */
- template<class T>
- class P4 {
- public:
- explicit P4(T* p)
- : p_(p) { }
- T* operator->() const BOOST_NOEXCEPT {
- return 0;
- }
- T* get() const BOOST_NOEXCEPT {
- return p_;
- }
- private:
- int* p_;
- };
- namespace boost {
- template<class T>
- struct pointer_traits<P4<T> > {
- static T* to_address(const P4<T>& p) BOOST_NOEXCEPT {
- return p.get();
- }
- };
- } /* boost */
- #if !defined(BOOST_NO_CXX11_POINTER_TRAITS)
- template<class T>
- class P5 {
- public:
- explicit P5(T* p)
- : p_(p) { }
- T* get() const BOOST_NOEXCEPT {
- return p_;
- }
- private:
- T* p_;
- };
- namespace std {
- template<class T>
- struct pointer_traits<P5<T> > {
- static T* to_address(const P5<T>& p) BOOST_NOEXCEPT {
- return p.get();
- }
- };
- } /* std */
- template<class T>
- class P6 {
- public:
- explicit P6(T* p)
- : p_(p) { }
- T* get() const BOOST_NOEXCEPT {
- return p_;
- }
- private:
- T* p_;
- };
- namespace boost {
- template<class T>
- struct pointer_traits<P6<T> > {
- static T* to_address(const P6<T>& p) BOOST_NOEXCEPT {
- return p.get();
- }
- };
- } /* boost */
- namespace std {
- template<class T>
- struct pointer_traits<P6<T> > {
- static T* to_address(const P6<T>& p) BOOST_NOEXCEPT {
- return 0;
- }
- };
- } /* std */
- #endif
- #endif
- int main()
- {
- int i = 0;
- BOOST_TEST(boost::to_address(&i) == &i);
- int* p = &i;
- BOOST_TEST(boost::to_address(p) == &i);
- P1<int> p1(&i);
- BOOST_TEST(boost::to_address(p1) == &i);
- P2<int> p2(&i);
- BOOST_TEST(boost::to_address(p2) == &i);
- #if !defined(BOOST_NO_CXX14_RETURN_TYPE_DEDUCTION)
- P3<int> p3(&i);
- BOOST_TEST(boost::to_address(p3) == &i);
- P4<int> p4(&i);
- BOOST_TEST(boost::to_address(p4) == &i);
- #if !defined(BOOST_NO_CXX11_POINTER_TRAITS)
- P5<int> p5(&i);
- BOOST_TEST(boost::to_address(p5) == &i);
- P6<int> p6(&i);
- BOOST_TEST(boost::to_address(p6) == &i);
- #endif
- #endif
- return boost::report_errors();
- }
|