129 lines
2.9 KiB
C++
129 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/lightweight_test.hpp>
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#include <boost/make_shared.hpp>
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#if !defined(BOOST_NO_CXX11_ALLOCATOR)
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struct counters {
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unsigned allocate;
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unsigned construct;
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};
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template<class T = void>
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class creator {
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public:
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typedef T value_type;
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creator(counters* state)
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: state_(state) { }
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template<class U>
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creator(const creator<U>& other)
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: state_(other.state()) { }
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T* allocate(std::size_t size) {
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void* ptr = ::operator new(sizeof(T) * size);
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++state_->allocate;
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return static_cast<T*>(ptr);
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}
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void deallocate(T* ptr, std::size_t) {
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::operator delete(ptr);
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--state_->allocate;
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}
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template<class... Args>
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void construct(T* ptr, Args&&... args) {
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::new(static_cast<void*>(ptr)) T(std::forward<Args>(args)...);
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++state_->construct;
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}
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void destroy(T* ptr) {
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ptr->~T();
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--state_->construct;
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}
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counters* state() const {
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return state_;
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}
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private:
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counters* state_;
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};
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template<class T, class U>
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inline bool
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operator==(const creator<T>& lhs, const creator<U>& rhs)
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{
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return lhs.state() == rhs.state();
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}
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template<class T, class U>
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inline bool
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operator!=(const creator<T>& lhs, const creator<U>& rhs)
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{
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return !(lhs == rhs);
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}
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struct deleter {
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template<class U>
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void operator()(U ptr) const {
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delete ptr;
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}
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};
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int main()
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{
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{
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counters state = { };
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boost::shared_ptr<int> pointer(new int(), deleter(),
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creator<int>(&state));
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BOOST_TEST(state.allocate == 1);
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BOOST_TEST(state.construct == 0);
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pointer.reset();
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BOOST_TEST(state.allocate == 0);
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}
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{
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counters state = { };
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boost::shared_ptr<int> pointer =
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boost::allocate_shared<int>(creator<int>(&state));
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BOOST_TEST(state.allocate == 1);
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BOOST_TEST(state.construct == 1);
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pointer.reset();
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BOOST_TEST(state.allocate == 0);
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BOOST_TEST(state.construct == 0);
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}
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{
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counters state = { };
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boost::shared_ptr<int[]> pointer =
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boost::allocate_shared<int[]>(creator<>(&state), 5);
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BOOST_TEST(state.allocate == 1);
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BOOST_TEST(state.construct == 5);
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pointer.reset();
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BOOST_TEST(state.allocate == 0);
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BOOST_TEST(state.construct == 0);
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}
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{
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counters state = { };
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boost::shared_ptr<int[5]> pointer =
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boost::allocate_shared<int[5]>(creator<>(&state));
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BOOST_TEST(state.allocate == 1);
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BOOST_TEST(state.construct == 5);
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pointer.reset();
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BOOST_TEST(state.allocate == 0);
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BOOST_TEST(state.construct == 0);
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}
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return boost::report_errors();
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}
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#else
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int main()
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{
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return 0;
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}
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#endif
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