secure_cast.h

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// Copyright 2002-2022 CEA LIST
// SPDX-FileCopyrightText: 2022 CEA LIST <gael.de-chalendar@cea.fr>
//
// SPDX-License-Identifier: MIT
 
#ifndef DEEPLIMA_INCLUDE_SECURE_CAST_H
#define DEEPLIMA_INCLUDE_SECURE_CAST_H
 
#include <limits>
#include <stdexcept>
 
namespace deeplima
{
namespace utils
{
 
template <typename To, typename From>
inline To cast_to_signed(const From arg)
{
  static_assert(std::numeric_limits<To>::min() < 0,
                "cast_to_signed used in incorrect context (To, min)");
 
  static_assert(std::numeric_limits<From>::min() == 0,
                "cast_to_signed used in incorrect context (From, min)");
 
  static_assert(std::numeric_limits<To>::max() < std::numeric_limits<From>::max(),
                "cast_to_signed used in incorrect context (max)");
 
  if (arg <= static_cast<From>(std::numeric_limits<To>::max()))
  {
    return static_cast<To>(arg);
  }
 
  throw std::overflow_error("cast_to_signed: argument is too big");
}
 
} // namespace utils
} // namespace deeplima
 
#endif