custom_component_vector_handle.h

/*****************************************************************************
 * VCLib                                                                     *
 * Visual Computing Library                                                  *
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 * Copyright(C) 2021-2025                                                    *
 * Visual Computing Lab                                                      *
 * ISTI - Italian National Research Council                                  *
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 * it under the terms of the Mozilla Public License Version 2.0 as published *
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 * This program is distributed in the hope that it will be useful,           *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the              *
 * Mozilla Public License Version 2.0                                        *
 * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
 ****************************************************************************/
 
#ifndef VCL_MESH_CONTAINERS_BASE_CUSTOM_COMPONENT_VECTOR_HANDLE_H
#define VCL_MESH_CONTAINERS_BASE_CUSTOM_COMPONENT_VECTOR_HANDLE_H
 
#include <vclib/base.h>
 
#include <any>
#include <vector>
 
namespace vcl {
 
template<typename T>
class CustomComponentVectorHandle
{
    std::vector<std::reference_wrapper<T>> mVec;
 
public:
    class Iterator : public std::vector<std::reference_wrapper<T>>::iterator
    {
        using Base = std::vector<std::reference_wrapper<T>>::iterator;
 
    public:
        using value_type = T;
        using reference  = value_type&;
        using pointer    = value_type*;
 
        using Base::Base;
 
        Iterator(Base it) : Base(it) {}
 
        reference operator*() const { return Base::operator*().get(); }
 
        pointer operator->() const { return &(Base::operator*().get()); }
    };
 
    class ConstIterator :
            public std::vector<std::reference_wrapper<T>>::const_iterator
    {
        using Base = std::vector<std::reference_wrapper<T>>::const_iterator;
 
    public:
        using value_type = T;
        using reference  = const value_type&;
        using pointer    = const value_type*;
 
        using Base::Base;
 
        ConstIterator(Base it) : Base(it) {}
 
        reference operator*() const { return Base::operator*().get(); }
 
        pointer operator->() const { return &(Base::operator*().get()); }
    };
 
    CustomComponentVectorHandle() {}
 
    CustomComponentVectorHandle(std::vector<std::any>& cc)
    {
        mVec.reserve(cc.size());
        for (uint i = 0; i < cc.size(); ++i) {
            mVec.push_back(std::any_cast<T&>(cc[i]));
        }
    }
 
    T& at(uint i) { return mVec[i].get(); }
 
    const T& at(uint i) const { return mVec[i].get(); }
 
    T& front() { return mVec.begin()->get(); }
 
    const T& front() const { return mVec.begin()->get(); }
 
    T& back() { return std::prev(mVec.end())->get(); }
 
    const T& back() const { return std::prev(mVec.end())->get(); }
 
    uint size() const { return mVec.size(); }
 
    T& operator[](uint i) { return mVec[i].get(); }
 
    const T& operator[](uint i) const { return mVec[i].get(); }
 
    Iterator begin() { return Iterator(mVec.begin()); }
 
    Iterator end() { return Iterator(mVec.end()); }
 
    ConstIterator begin() const { return ConstIterator(mVec.begin()); }
 
    ConstIterator end() const { return ConstIterator(mVec.end()); }
};
 
template<typename T>
using ConstCustomComponentVectorHandle = CustomComponentVectorHandle<const T>;
 
} // namespace vcl
 
#endif // VCL_MESH_CONTAINERS_BASE_CUSTOM_COMPONENT_VECTOR_HANDLE_H