MRConstChildren.h

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#pragma once
 
#include "MRPch/MRBindingMacros.h"
#include "MRMeshFwd.h"
 
#include <iterator>
#include <memory>
#include <vector>
 
namespace MR
{
 

class ConstChildren
{
public:
    using Storage = std::vector<std::shared_ptr<Object>>;

    class MR_BIND_IGNORE_PY Iterator
    {
    public:
        using iterator_concept = std::forward_iterator_tag;
        using iterator_category = std::input_iterator_tag;
        using value_type = std::shared_ptr<const Object>;
        using difference_type = std::ptrdiff_t;
 
        Iterator() {}
        explicit Iterator( Storage::const_iterator it ) : it_( it ) {}
 
        [[nodiscard]] value_type operator *() const { return *it_; }
        Iterator & operator ++() { ++it_; return *this; }
        Iterator operator ++( int ) { auto res = *this; ++it_; return res; }
        [[nodiscard]] bool operator ==( const Iterator & ) const = default;
 
    private:
        Storage::const_iterator it_{};
    };
 
    explicit ConstChildren( const Storage & children ) : children_( children ) {}
 
    [[nodiscard]] MR_BIND_IGNORE_PY Iterator begin() const { return Iterator( children_.begin() ); }
    [[nodiscard]] MR_BIND_IGNORE_PY Iterator end() const { return Iterator( children_.end() ); }
 
    [[nodiscard]] bool empty() const { return children_.empty(); }
    [[nodiscard]] size_t size() const { return children_.size(); }
    [[nodiscard]] std::shared_ptr<const Object> operator []( size_t i ) const { return children_[i]; }
 
private:
    const Storage & children_;
};
 
}