93 lines
2.7 KiB
C++
93 lines
2.7 KiB
C++
/*
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Open Asset Import Library (assimp)
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----------------------------------------------------------------------
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Copyright (c) 2006-2022, assimp team
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All rights reserved.
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Redistribution and use of this software in source and binary forms,
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with or without modification, are permitted provided that the
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following conditions are met:
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* Redistributions of source code must retain the above
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copyright notice, this list of conditions and the
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following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the
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following disclaimer in the documentation and/or other
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materials provided with the distribution.
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* Neither the name of the assimp team, nor the names of its
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contributors may be used to endorse or promote products
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derived from this software without specific prior
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written permission of the assimp team.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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----------------------------------------------------------------------
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*/
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#pragma once
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#include <assimp/ai_assert.h>
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#include <utility>
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namespace Assimp {
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/// @brief This class implements an optional type
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/// @tparam T The type to store.
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template <typename T>
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struct Maybe {
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/// @brief
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Maybe() = default;
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/// @brief
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/// @param val
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template <typename U>
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explicit Maybe(U &&val) :
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_val(std::forward<U>(val)), _valid(true) {}
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/// @brief Validate the value
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/// @return true if valid.
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operator bool() const {
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return _valid;
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}
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/// @brief Will assign a value.
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/// @param v The new valid value.
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template <typename U>
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void Set(U &&v) {
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ai_assert(!_valid);
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_valid = true;
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_val = std::forward<U>(v);
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}
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/// @brief Will return the value when it is valid.
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/// @return The value.
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const T &Get() const {
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ai_assert(_valid);
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return _val;
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}
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Maybe &operator&() = delete;
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Maybe(const Maybe &) = delete;
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private:
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T _val;
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bool _valid = false;
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};
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} // namespace Assimp
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