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- /*
- Copyright 2007 Tobias Schwinger
- Copyright 2019 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/functional/factory.hpp>
- #include <boost/core/lightweight_test.hpp>
- #include <boost/smart_ptr/shared_ptr.hpp>
- class sum {
- public:
- sum(int a, int b)
- : value_(a + b) { }
- int get() const {
- return value_;
- }
- private:
- int value_;
- };
- template<class T>
- class creator {
- public:
- static int count;
- typedef T value_type;
- typedef T* pointer;
- template<class U>
- struct rebind {
- typedef creator<U> other;
- };
- creator() { }
- template<class U>
- creator(const creator<U>&) { }
- T* allocate(std::size_t size) {
- ++count;
- return static_cast<T*>(::operator new(sizeof(T) * size));
- }
- void deallocate(T* ptr, std::size_t) {
- --count;
- ::operator delete(ptr);
- }
- };
- template<class T>
- int creator<T>::count = 0;
- template<class T, class U>
- inline bool
- operator==(const creator<T>&, const creator<U>&)
- {
- return true;
- }
- template<class T, class U>
- inline bool
- operator!=(const creator<T>&, const creator<U>&)
- {
- return false;
- }
- int main()
- {
- int a = 1;
- int b = 2;
- {
- boost::shared_ptr<sum> s(boost::factory<boost::shared_ptr<sum>,
- creator<void>,
- boost::factory_alloc_for_pointee_and_deleter>()(a, b));
- BOOST_TEST(creator<sum>::count == 1);
- BOOST_TEST(s->get() == 3);
- }
- BOOST_TEST(creator<sum>::count == 0);
- {
- boost::shared_ptr<sum> s(boost::factory<boost::shared_ptr<sum>,
- creator<void>,
- boost::factory_passes_alloc_to_smart_pointer>()(a, b));
- BOOST_TEST(creator<sum>::count == 1);
- BOOST_TEST(s->get() == 3);
- }
- BOOST_TEST(creator<sum>::count == 0);
- return boost::report_errors();
- }
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