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#pragma once
// cmp.hpp - comparison related operations
//
// Copyright © 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 <limits>
#include "../diagnostics.hpp"
namespace tmwa
{
namespace ints
{
DIAG_PUSH();
DIAG_I(type_limits);
template<class T, class U>
T saturate(const U& v)
{
typedef std::numeric_limits<T> Tlim;
typedef std::numeric_limits<U> Ulim;
if (Tlim::is_signed == Ulim::is_signed)
{
if (v > Tlim::max())
return Tlim::max();
if (v < Tlim::min())
return Tlim::min();
return v;
}
else if (Ulim::is_signed)
{
// from signed to unsigned
// Not like v < Tlim::min(), even though Tlim::min() == 0
if (v < 0)
return 0;
if (v > Tlim::max())
return Tlim::max();
return v;
}
else // Tlim::is_signed
{
// from unsigned to signed
if (v > Tlim::max())
return Tlim::max();
return v;
}
}
DIAG_POP();
} // namespace ints
using ints::saturate;
} // namespace tmwa
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