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/*
* Copyright (C) 2005-2022 Centre National d'Etudes Spatiales (CNES)
*
* This file is part of Orfeo Toolbox
*
* https://www.orfeo-toolbox.org/
*
* 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 otbNotNull_h
#define otbNotNull_h
#include <cstddef>
#include <cassert>
namespace otb
{
/**
* Simplified version of `GSL::not_null`.
*
* Permits to holds pointers that shall never be null.
*
* `GSL::not_null` is under MIT licence
*/
template <typename T>
class NotNull
{
public:
constexpr NotNull(T p) : m_p(p) { assert(p); }
NotNull (std::nullptr_t) = delete;
NotNull& operator=(std::nullptr_t) = delete;
constexpr T get() const
{
assert(m_p);
return m_p;
}
constexpr operator T() const { return get(); }
constexpr T operator->() const { return get(); }
constexpr decltype(auto) operator*() const { return *get(); }
// unwanted operators...pointers only point to single objects!
NotNull& operator++() = delete;
NotNull& operator--() = delete;
NotNull operator++(int) = delete;
NotNull operator--(int) = delete;
NotNull& operator+=(std::ptrdiff_t) = delete;
NotNull& operator-=(std::ptrdiff_t) = delete;
void operator[](std::ptrdiff_t) const = delete;
private:
T m_p;
};
} // otb namespace
#endif // otbNotNull_h
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