132 lines
2.9 KiB
C++
132 lines
2.9 KiB
C++
/*
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Copyright 2017 Glen Joseph Fernandes
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(glenjofe@gmail.com)
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Distributed under the Boost Software License, Version 1.0.
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(http://www.boost.org/LICENSE_1_0.txt)
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*/
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#include <boost/core/pointer_traits.hpp>
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#include <boost/core/lightweight_test.hpp>
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template<class T>
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class pointer {
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public:
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typedef typename boost::pointer_traits<T>::element_type element_type;
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pointer(T value)
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: value_(value) { }
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T operator->() const BOOST_NOEXCEPT {
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return value_;
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}
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private:
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T value_;
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};
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template<class T>
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class special {
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public:
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special(T* value)
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: value_(value) { }
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T* get() const BOOST_NOEXCEPT {
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return value_;
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}
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private:
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T* value_;
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};
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namespace boost {
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template<class T>
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struct pointer_traits<special<T> > {
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typedef special<T> pointer;
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typedef T element_type;
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typedef std::ptrdiff_t difference_type;
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template<class U>
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struct rebind_to {
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typedef special<U> type;
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};
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#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
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template<class U>
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using rebind = typename rebind_to<U>::type;
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#endif
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template<class U>
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static pointer pointer_to(U& v) BOOST_NOEXCEPT {
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return pointer(&v);
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}
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static element_type* to_address(const pointer& v) BOOST_NOEXCEPT {
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return v.get();
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}
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};
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} /* boost */
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int main()
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{
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int i = 0;
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{
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typedef int* type;
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type p = &i;
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BOOST_TEST(boost::to_address(p) == &i);
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}
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{
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typedef pointer<int*> type;
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type p(&i);
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BOOST_TEST(boost::to_address(p) == &i);
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}
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{
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typedef pointer<pointer<int*> > type;
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type p(&i);
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BOOST_TEST(boost::to_address(p) == &i);
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}
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{
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typedef void* type;
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type p = &i;
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BOOST_TEST(boost::to_address(p) == &i);
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}
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{
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typedef pointer<void*> type;
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type p(&i);
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BOOST_TEST(boost::to_address(p) == &i);
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}
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{
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typedef const int* type;
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type p = &i;
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BOOST_TEST(boost::to_address(p) == &i);
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}
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{
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typedef pointer<const int*> type;
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type p(&i);
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BOOST_TEST(boost::to_address(p) == &i);
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}
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{
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typedef special<int> type;
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type p(&i);
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BOOST_TEST(boost::to_address(p) == &i);
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}
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{
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typedef special<void> type;
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type p(&i);
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BOOST_TEST(boost::to_address(p) == &i);
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}
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{
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typedef special<const int> type;
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type p(&i);
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BOOST_TEST(boost::to_address(p) == &i);
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}
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{
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typedef pointer<special<int> > type;
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type p(&i);
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BOOST_TEST(boost::to_address(p) == &i);
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}
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{
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typedef pointer<special<void> > type;
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type p(&i);
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BOOST_TEST(boost::to_address(p) == &i);
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}
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{
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typedef pointer<special<const int> > type;
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type p(&i);
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BOOST_TEST(boost::to_address(p) == &i);
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}
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return boost::report_errors();
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}
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