Update Assimp from 5.2.3 to 5.2.5

Engine/lib/assimp/code/Common/Maybe.h

@@ -0,0 +1,92 @@
+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2022, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the
+following conditions are met:
+
+* Redistributions of source code must retain the above
+  copyright notice, this list of conditions and the
+  following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the
+  following disclaimer in the documentation and/or other
+  materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+  contributors may be used to endorse or promote products
+  derived from this software without specific prior
+  written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+----------------------------------------------------------------------
+*/
+#pragma once
+
+#include <assimp/ai_assert.h>
+#include <utility>
+
+namespace Assimp {
+
+/// @brief This class implements an optional type
+/// @tparam T   The type to store.
+template <typename T>
+struct Maybe {
+    /// @brief
+    Maybe() = default;
+
+    /// @brief
+    /// @param val
+    template <typename U>
+    explicit Maybe(U &&val) :
+            _val(std::forward<U>(val)), _valid(true) {}
+
+    /// @brief Validate the value
+    /// @return true if valid.
+    operator bool() const {
+        return _valid;
+    }
+
+    /// @brief Will assign a value.
+    /// @param v The new valid value.
+    template <typename U>
+    void Set(U &&v) {
+        ai_assert(!_valid);
+
+        _valid = true;
+        _val = std::forward<U>(v);
+    }
+
+    /// @brief  Will return the value when it is valid.
+    /// @return The value.
+    const T &Get() const {
+        ai_assert(_valid);
+        return _val;
+    }
+
+    Maybe &operator&() = delete;
+    Maybe(const Maybe &) = delete;
+
+private:
+    T _val;
+    bool _valid = false;
+};
+
+} // namespace Assimp