path: root/src/generic/dumb_ptr.hpp

#pragma once
//    dumb_ptr.hpp - temporary new/delete wrappers
//
//    Copyright © 2013 Ben Longbons <b.r.longbons@gmail.com>
//
//    This file is part of The Mana World (Athena server)
//
//    This program is free software: you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation, either version 3 of the License, or
//    (at your option) any later version.
//
//    This program is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//    GNU General Public License for more details.
//
//    You should have received a copy of the GNU General Public License
//    along with this program.  If not, see <http://www.gnu.org/licenses/>.

#include "fwd.hpp"

#include <algorithm>
#include <utility>


namespace tmwa
{
// unmanaged new/delete-able pointer
// should be replaced by std::unique_ptr<T>
template<class T>
class dumb_ptr
{
    template<class U>
    friend class dumb_ptr;
    T *impl;
public:
    dumb_ptr() noexcept
    : impl(nullptr)
    {}
    explicit
    dumb_ptr(T *p) noexcept
    : impl(p)
    {}
    template<class U>
    dumb_ptr(dumb_ptr<U> p)
    : impl(p.impl)
    {}
    dumb_ptr(std::nullptr_t)
    : impl(nullptr)
    {}

    void delete_()
    {
        delete impl;
        *this = nullptr;
    }
    template<class... A>
    void new_(A&&... a)
    {
        impl = new T(std::forward<A>(a)...);
    }
    template<class... A>
    static
    dumb_ptr<T> make(A&&... a)
    {
        return dumb_ptr<T>(new T(std::forward<A>(a)...));
    }
    dumb_ptr& operator = (std::nullptr_t)
    {
        impl = nullptr;
        return *this;
    }

    T& operator *() const
    {
        return *impl;
    }
    T *operator->() const
    {
        return impl;
    }

    explicit
    operator bool() const
    {
        return impl;
    }
    bool operator !() const
    {
        return !impl;
    }

    friend bool operator == (dumb_ptr l, dumb_ptr r)
    {
        return l.impl == r.impl;
    }
    friend bool operator != (dumb_ptr l, dumb_ptr r)
    {
        return !(l == r);
    }
};

// unmanaged new/delete-able pointer
// should be replaced by std::unique_ptr<T[]> or std::vector<T>
template<class T>
class dumb_ptr<T[]>
{
    T *impl;
    size_t sz;
public:
    dumb_ptr() noexcept : impl(), sz() {}
    dumb_ptr(std::nullptr_t)
    : impl(nullptr), sz(0) {}
    dumb_ptr(T *p, size_t z)
    : impl(p)
    , sz(z)
    {}

    void delete_()
    {
        delete[] impl;
        *this = nullptr;
    }
    void new_(size_t z)
    {
        impl = new T[z]();
        sz = z;
    }
    static
    dumb_ptr<T[]> make(size_t z)
    {
        return dumb_ptr<T[]>(new T[z](), z);
    }
    dumb_ptr& operator = (std::nullptr_t)
    {
        impl = nullptr;
        sz = 0;
        return *this;
    }

    size_t size() const
    {
        return sz;
    }
    void resize(size_t z)
    {
        if (z == sz)
            return;
        T *np = new T[z]();
        // not exception-safe, but we don't have a dtor anyway
        size_t i = std::min(z, sz);
        while (i-->0)
            np[i] = std::move(impl[i]);
        delete[] impl;
        impl = np;
        sz = z;
    }

    T& operator[](size_t i) const
    {
        return impl[i];
    }

    explicit
    operator bool() const
    {
        return impl;
    }
    bool operator !() const
    {
        return !impl;
    }

    friend bool operator == (dumb_ptr l, dumb_ptr r)
    {
        return l.impl == r.impl;
    }
    friend bool operator != (dumb_ptr l, dumb_ptr r)
    {
        return !(l == r);
    }
};
} // namespace tmwa