indexedDataIterator.h

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//
// Copyright 2025 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_EXEC_VDF_INDEXED_DATA_ITERATOR_H
#define PXR_EXEC_VDF_INDEXED_DATA_ITERATOR_H
 
 
#include "pxr/pxr.h"
 
#include <iterator>
#include <vector>
 
PXR_NAMESPACE_OPEN_SCOPE
 
template <typename IteratedType>
class VdfIndexedDataIterator
{
public:
    using BaseIterator = typename std::vector<IteratedType>::const_iterator;
 
    using iterator_category = std::forward_iterator_tag;
    using value_type = typename BaseIterator::value_type;
    using reference = typename BaseIterator::reference;
    using pointer = typename BaseIterator::pointer;
    using difference_type = typename BaseIterator::difference_type;
 
    // Only default construction is publicly allowed, and the resulting
    // object is invalid.
    VdfIndexedDataIterator() = default;
 
    reference operator*() const { return *_baseIterator; }
    pointer operator->() const { return &(*_baseIterator); }
 
    VdfIndexedDataIterator &operator++() {
        ++_baseIterator;
        return *this;
    }
 
    VdfIndexedDataIterator operator++(int) {
        VdfIndexedDataIterator r(*this);
        ++_baseIterator;
        return r;
    }
 
    bool operator==(const VdfIndexedDataIterator &rhs) const {
        return _baseIterator == rhs._baseIterator;
    }
 
    bool operator!=(const VdfIndexedDataIterator &rhs) const {
        return _baseIterator != rhs._baseIterator;
    }
 
private:
    // Allow VdfIndexedData (only) to construct these.
    template <typename T>
    friend class VdfIndexedData;
 
    explicit VdfIndexedDataIterator(const BaseIterator& iter) :
        _baseIterator(iter) {}
 
    // The underlying base iterator
    BaseIterator _baseIterator;
};
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif  // #ifndef PXR_EXEC_VDF_INDEXED_DATA_ITERATOR_H