clamp.hpp

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// Copyright 2020 PAL Robotics S.L.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
#ifndef RCPPMATH__CLAMP_HPP_
#define RCPPMATH__CLAMP_HPP_
 
#include <cassert>
 
namespace rcppmath
{
//  than v, returns hi; otherwise returns v. Uses operator< to compare the values
template<class T>
constexpr const T & clamp(const T & v, const T & lo, const T & hi)
{
  assert(!(hi < lo) );
  return (v < lo) ? lo : (hi < v) ? hi : v;
}
 
 
template<class T, class Compare>
constexpr const T & clamp(const T & v, const T & lo, const T & hi, Compare comp)
{
  assert(!comp(hi, lo) );
  return comp(v, lo) ? lo : comp(hi, v) ? hi : v;
}
 
}  // namespace rcppmath
 
#endif  // RCPPMATH__CLAMP_HPP_