boost_unordered/test/objects/test.hpp

// Copyright 2006-2009 Daniel James.
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

#if !defined(BOOST_UNORDERED_TEST_OBJECTS_HEADER)
#define BOOST_UNORDERED_TEST_OBJECTS_HEADER

#include <boost/config.hpp>
#include <boost/limits.hpp>
#include <cstddef>
#include "../helpers/fwd.hpp"
#include "../helpers/count.hpp"
#include "../helpers/memory.hpp"

namespace test
{
    // Note that the default hash function will work for any equal_to (but not
    // very well).
    class object;
    class implicitly_convertible;
    class hash;
    class less;
    class equal_to;
    template <class T> class allocator1;
    template <class T> class allocator2;
    object generate(object const*);
    implicitly_convertible generate(implicitly_convertible const*);

    inline void ignore_variable(void const*) {}

    class object : private counted_object
    {
        friend class hash;
        friend class equal_to;
        friend class less;
        int tag1_, tag2_;
    public:
        explicit object(int t1 = 0, int t2 = 0) : tag1_(t1), tag2_(t2) {}

        ~object() {
            tag1_ = -1;
            tag2_ = -1;
        }

        friend bool operator==(object const& x1, object const& x2) {
            return x1.tag1_ == x2.tag1_ && x1.tag2_ == x2.tag2_;
        }

        friend bool operator!=(object const& x1, object const& x2) {
            return x1.tag1_ != x2.tag1_ || x1.tag2_ != x2.tag2_;
        }

        friend bool operator<(object const& x1, object const& x2) {
            return x1.tag1_ < x2.tag1_ ||
                (x1.tag1_ == x2.tag1_ && x1.tag2_ < x2.tag2_);
        }

        friend object generate(object const*) {
            int* x = 0;
            return object(generate(x), generate(x));
        }

        friend std::ostream& operator<<(std::ostream& out, object const& o)
        {
            return out<<"("<<o.tag1_<<","<<o.tag2_<<")";
        }
    };

    class implicitly_convertible : private counted_object
    {
        int tag1_, tag2_;
    public:

        explicit implicitly_convertible(int t1 = 0, int t2 = 0)
            : tag1_(t1), tag2_(t2)
            {}

        operator object() const
        {
            return object(tag1_, tag2_);
        }

        friend implicitly_convertible generate(implicitly_convertible const*) {
            int* x = 0;
            return implicitly_convertible(generate(x), generate(x));
        }

        friend std::ostream& operator<<(std::ostream& out, implicitly_convertible const& o)
        {
            return out<<"("<<o.tag1_<<","<<o.tag2_<<")";
        }
    };

    class hash
    {
        int type_;
    public:
        explicit hash(int t = 0) : type_(t) {}

        std::size_t operator()(object const& x) const {
            switch(type_) {
            case 1:
                return x.tag1_;
            case 2:
                return x.tag2_;
            default:
                return x.tag1_ + x.tag2_; 
            }
        }

        std::size_t operator()(int x) const {
            return x;
        }

        friend bool operator==(hash const& x1, hash const& x2) {
            return x1.type_ == x2.type_;
        }

        friend bool operator!=(hash const& x1, hash const& x2) {
            return x1.type_ != x2.type_;
        }
    };
    
    std::size_t hash_value(test::object const& x) {
        return hash()(x);
    }

    class less
    {
        int type_;
    public:
        explicit less(int t = 0) : type_(t) {}

        bool operator()(object const& x1, object const& x2) const {
            switch(type_) {
            case 1:
                return x1.tag1_ < x2.tag1_;
            case 2:
                return x1.tag2_ < x2.tag2_;
            default:
                return x1 < x2;
            }
        }

        std::size_t operator()(int x1, int x2) const {
            return x1 < x2;
        }

        friend bool operator==(less const& x1, less const& x2) {
            return x1.type_ == x2.type_;
        }
    };

    class equal_to
    {
        int type_;
    public:
        explicit equal_to(int t = 0) : type_(t) {}

        bool operator()(object const& x1, object const& x2) const {
            switch(type_) {
            case 1:
                return x1.tag1_ == x2.tag1_;
            case 2:
                return x1.tag2_ == x2.tag2_;
            default:
                return x1 == x2;
            }
        }

        std::size_t operator()(int x1, int x2) const {
            return x1 == x2;
        }

        friend bool operator==(equal_to const& x1, equal_to const& x2) {
            return x1.type_ == x2.type_;
        }

        friend bool operator!=(equal_to const& x1, equal_to const& x2) {
            return x1.type_ != x2.type_;
        }

        friend less create_compare(equal_to x) {
            return less(x.type_);
        }
    };

    // allocator1 only has the old fashioned 'construct' method and has
    // a few less typedefs. allocator2 uses a custom pointer class.

    template <class T>
    class allocator1
    {
    public:
        int tag_;

        typedef T value_type;

        template <class U> struct rebind { typedef allocator1<U> other; };

        explicit allocator1(int t = 0) : tag_(t)
        {
            detail::tracker.allocator_ref();
        }

        template <class Y> allocator1(allocator1<Y> const& x)
            : tag_(x.tag_)
        {
            detail::tracker.allocator_ref();
        }

        allocator1(allocator1 const& x)
            : tag_(x.tag_)
        {
            detail::tracker.allocator_ref();
        }

        ~allocator1()
        {
            detail::tracker.allocator_unref();
        }

        T* allocate(std::size_t n) {
            T* ptr(static_cast<T*>(::operator new(n * sizeof(T))));
            detail::tracker.track_allocate((void*) ptr, n, sizeof(T), tag_);
            return ptr;
        }

        T* allocate(std::size_t n, void const* u)
        {
            T* ptr(static_cast<T*>(::operator new(n * sizeof(T))));
            detail::tracker.track_allocate((void*) ptr, n, sizeof(T), tag_);
            return ptr;
        }

        void deallocate(T* p, std::size_t n)
        {
            detail::tracker.track_deallocate((void*) p, n, sizeof(T), tag_);
            ::operator delete((void*) p);
        }

        void construct(T* p, T const& t) {
            // Don't count constructions here as it isn't always called.
            //detail::tracker.track_construct((void*) p, sizeof(T), tag_);
            new(p) T(t);
        }

        void destroy(T* p) {
            //detail::tracker.track_destroy((void*) p, sizeof(T), tag_);
            p->~T();

            // Work around MSVC buggy unused parameter warning.
            ignore_variable(&p);
        }

        bool operator==(allocator1 const& x) const
        {
            return tag_ == x.tag_;
        }

        bool operator!=(allocator1 const& x) const
        {
            return tag_ != x.tag_;
        }

        enum {
            is_select_on_copy = false,
            is_propagate_on_swap = false,
            is_propagate_on_assign = false,
            is_propagate_on_move = false
        };
    };

    template <class T> class ptr;
    template <class T> class const_ptr;

    struct void_ptr
    {
#if !defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)
        template <typename T>
        friend class ptr;
    private:
#endif

        void* ptr_;

    public:
        void_ptr() : ptr_(0) {}

        template <typename T>
        explicit void_ptr(ptr<T> const& x) : ptr_(x.ptr_) {}

        // I'm not using the safe bool idiom because the containers should be
        // able to cope with bool conversions.
        operator bool() const { return !!ptr_; }

        bool operator==(void_ptr const& x) const { return ptr_ == x.ptr_; }
        bool operator!=(void_ptr const& x) const { return ptr_ != x.ptr_; }
    };

    class void_const_ptr
    {
#if !defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)
        template <typename T>
        friend class const_ptr;
    private:
#endif

        void* ptr_;

    public:
        void_const_ptr() : ptr_(0) {}

        template <typename T>
        explicit void_const_ptr(const_ptr<T> const& x) : ptr_(x.ptr_) {}

        // I'm not using the safe bool idiom because the containers should be
        // able to cope with bool conversions.
        operator bool() const { return !!ptr_; }

        bool operator==(void_const_ptr const& x) const { return ptr_ == x.ptr_; }
        bool operator!=(void_const_ptr const& x) const { return ptr_ != x.ptr_; }
    };

    template <class T>
    class ptr
    {
        friend class allocator2<T>;
        friend class const_ptr<T>;
        friend struct void_ptr;

        T* ptr_;

        ptr(T* x) : ptr_(x) {}
    public:
        ptr() : ptr_(0) {}
        explicit ptr(void_ptr const& x) : ptr_((T*) x.ptr_) {}

        T& operator*() const { return *ptr_; }
        T* operator->() const { return ptr_; }
        ptr& operator++() { ++ptr_; return *this; }
        ptr operator++(int) { ptr tmp(*this); ++ptr_; return tmp; }
        ptr operator+(std::ptrdiff_t s) const { return ptr<T>(ptr_ + s); }
        friend ptr operator+(std::ptrdiff_t s, ptr p)
            { return ptr<T>(s + p.ptr_); }
        T& operator[](std::ptrdiff_t s) const { return ptr_[s]; }
        bool operator!() const { return !ptr_; }

        // I'm not using the safe bool idiom because the containers should be
        // able to cope with bool conversions.
        operator bool() const { return !!ptr_; }

        bool operator==(ptr const& x) const { return ptr_ == x.ptr_; }
        bool operator!=(ptr const& x) const { return ptr_ != x.ptr_; }
        bool operator<(ptr const& x) const { return ptr_ < x.ptr_; }
        bool operator>(ptr const& x) const { return ptr_ > x.ptr_; }
        bool operator<=(ptr const& x) const { return ptr_ <= x.ptr_; }
        bool operator>=(ptr const& x) const { return ptr_ >= x.ptr_; }
    };

    template <class T>
    class const_ptr
    {
        friend class allocator2<T>;
        friend struct const_void_ptr;

        T const* ptr_;

        const_ptr(T const* ptr) : ptr_(ptr) {}
    public:
        const_ptr() : ptr_(0) {}
        const_ptr(ptr<T> const& x) : ptr_(x.ptr_) {}
        explicit const_ptr(void_const_ptr const& x) : ptr_((T const*) x.ptr_) {}

        T const& operator*() const { return *ptr_; }
        T const* operator->() const { return ptr_; }
        const_ptr& operator++() { ++ptr_; return *this; }
        const_ptr operator++(int) { const_ptr tmp(*this); ++ptr_; return tmp; }
        const_ptr operator+(std::ptrdiff_t s) const
            { return const_ptr(ptr_ + s); }
        friend const_ptr operator+(std::ptrdiff_t s, const_ptr p)
            { return ptr<T>(s + p.ptr_); }
        T const& operator[](int s) const { return ptr_[s]; }
        bool operator!() const { return !ptr_; }
        operator bool() const { return !!ptr_; }

        bool operator==(const_ptr const& x) const { return ptr_ == x.ptr_; }
        bool operator!=(const_ptr const& x) const { return ptr_ != x.ptr_; }
        bool operator<(const_ptr const& x) const { return ptr_ < x.ptr_; }
        bool operator>(const_ptr const& x) const { return ptr_ > x.ptr_; }
        bool operator<=(const_ptr const& x) const { return ptr_ <= x.ptr_; }
        bool operator>=(const_ptr const& x) const { return ptr_ >= x.ptr_; }
    };

    template <class T>
    class allocator2
    {
# ifdef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
    public:
# else
        template <class> friend class allocator2;
# endif
        int tag_;
    public:
        typedef std::size_t size_type;
        typedef std::ptrdiff_t difference_type;
        typedef void_ptr void_pointer;
        typedef void_const_ptr const_void_pointer;
        typedef ptr<T> pointer;
        typedef const_ptr<T> const_pointer;
        typedef T& reference;
        typedef T const& const_reference;
        typedef T value_type;

        template <class U> struct rebind { typedef allocator2<U> other; };

        explicit allocator2(int t = 0) : tag_(t)
        {
            detail::tracker.allocator_ref();
        }
        
        template <class Y> allocator2(allocator2<Y> const& x)
            : tag_(x.tag_)
        {
            detail::tracker.allocator_ref();
        }

        allocator2(allocator2 const& x)
            : tag_(x.tag_)
        {
            detail::tracker.allocator_ref();
        }

        ~allocator2()
        {
            detail::tracker.allocator_unref();
        }

        pointer address(reference r)
        {
            return pointer(&r);
        }

        const_pointer address(const_reference r)
        {
            return const_pointer(&r);
        }

        pointer allocate(size_type n) {
            pointer p(static_cast<T*>(::operator new(n * sizeof(T))));
            detail::tracker.track_allocate((void*) p.ptr_, n, sizeof(T), tag_);
            return p;
        }

        pointer allocate(size_type n, void const* u)
        {
            pointer ptr(static_cast<T*>(::operator new(n * sizeof(T))));
            detail::tracker.track_allocate((void*) ptr, n, sizeof(T), tag_);
            return ptr;
        }

        void deallocate(pointer p, size_type n)
        {
            detail::tracker.track_deallocate((void*) p.ptr_, n, sizeof(T), tag_);
            ::operator delete((void*) p.ptr_);
        }

        void construct(T* p, T const& t) {
            detail::tracker.track_construct((void*) p, sizeof(T), tag_);
            new(p) T(t);
        }

#if !defined(BOOST_NO_VARIADIC_TEMPLATES)
        template<class... Args> void construct(T* p, BOOST_FWD_REF(Args)... args) {
            detail::tracker.track_construct((void*) p, sizeof(T), tag_);
            new(p) T(boost::forward<Args>(args)...);
        }
#endif

        void destroy(T* p) {
            detail::tracker.track_destroy((void*) p, sizeof(T), tag_);
            p->~T();
        }

        size_type max_size() const {
            return (std::numeric_limits<size_type>::max)();
        }

        bool operator==(allocator2 const& x) const
        {
            return tag_ == x.tag_;
        }

        bool operator!=(allocator2 const& x) const
        {
            return tag_ != x.tag_;
        }

        enum {
            is_select_on_copy = false,
            is_propagate_on_swap = false,
            is_propagate_on_assign = false,
            is_propagate_on_move = false
        };
    };

    template <class T>
    bool equivalent_impl(allocator1<T> const& x, allocator1<T> const& y,
        test::derived_type)
    {
        return x == y;
    }

    template <class T>
    bool equivalent_impl(allocator2<T> const& x, allocator2<T> const& y,
        test::derived_type)
    {
        return x == y;
    }
}

#endif