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#pragma once
// cast.hpp - Change the type of a variable.
//
// Copyright © 2011-2014 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 <utility>
#include <type_traits>
namespace tmwa
{
template<class T>
const T& const_(T& t)
{
return t;
}
template<class T, class U>
T no_cast(U&& u)
{
typedef typename std::remove_reference<T>::type Ti;
typedef typename std::remove_reference<U>::type Ui;
typedef typename std::remove_cv<Ti>::type Tb;
typedef typename std::remove_cv<Ui>::type Ub;
static_assert(std::is_same<Tb, Ub>::value, "not no cast");
return std::forward<U>(u);
}
template<class T, class U>
T base_cast(U&& u)
{
static_assert(std::is_reference<T>::value, "must base cast with references");
typedef typename std::remove_reference<T>::type Ti;
typedef typename std::remove_reference<U>::type Ui;
typedef typename std::remove_cv<Ti>::type Tb;
typedef typename std::remove_cv<Ui>::type Ub;
static_assert(std::is_base_of<Tb, Ub>::value, "not base cast");
return std::forward<U>(u);
}
// use this when e.g. U is an int of unknown size
template<class T, class U>
T maybe_cast(U u)
{
return u;
}
template<class T, class U>
typename std::remove_pointer<T>::type *sign_cast(U *u)
{
typedef typename std::remove_pointer<T>::type T_;
static_assert(sizeof(T_) == sizeof(U), "sign cast must be same size");
return reinterpret_cast<T_ *>(u);
}
} // namespace tmwa
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