third_party/boost/smart_ptr/test/allocate_shared_array_esft_test.cpp

/*
Copyright 2012-2015 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/lightweight_test.hpp>
#include <boost/smart_ptr/enable_shared_from_this.hpp>
#include <boost/smart_ptr/make_shared.hpp>

template<class T = void>
struct creator {
    typedef T value_type;

    template<class U>
    struct rebind {
        typedef creator<U> other;
    };

    creator() { }

    template<class U>
    creator(const creator<U>&) { }

    T* allocate(std::size_t size) {
        return static_cast<T*>(::operator new(sizeof(T) * size));
    }

    void deallocate(T* ptr, std::size_t) {
        ::operator delete(ptr);
    }
};

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;
}

class type
    : public boost::enable_shared_from_this<type> {
public:
    static unsigned instances;

    type() {
        ++instances;
    }

    ~type() {
        --instances;
    }

private:
    type(const type&);
    type& operator=(const type&);
};

unsigned type::instances = 0;

int main()
{
    BOOST_TEST(type::instances == 0);
    {
        boost::shared_ptr<type[]> result =
            boost::allocate_shared<type[]>(creator<type>(), 3);
        try {
            result[0].shared_from_this();
            BOOST_ERROR("shared_from_this did not throw");
        } catch (...) {
            BOOST_TEST(type::instances == 3);
        }
    }
    BOOST_TEST(type::instances == 0);
    {
        boost::shared_ptr<type[]> result =
            boost::allocate_shared_noinit<type[]>(creator<>(), 3);
        try {
            result[0].shared_from_this();
            BOOST_ERROR("shared_from_this did not throw");
        } catch (...) {
            BOOST_TEST(type::instances == 3);
        }
    }
    return boost::report_errors();
}