Program Listing for File tokenlist.h

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#ifndef TOKENLIST_H
#define TOKENLIST_H

#include "token.h"
#include <list>

class CTokenList : public std::list<CToken>
{
public:
    CTokenList();

    CTokenList(const CTokenList& rlstTokens);

    CTokenList(CTokenList&& rlstTokens) noexcept;

    CTokenList& operator=(const CTokenList& rlstTokens);

    CTokenList& operator=(CTokenList&& rlstTokens) noexcept;

    const CToken& Current(size_t nIndex = 0) const;

    const CToken& LastValid() const;

    CTokenList operator++(int) const;

    const CTokenList& operator++() const;

    bool End() const;

    void push_front(const CToken& rToken);
    void push_front(CToken&& rToken);
    void pop_front();

    void push_back(const CToken& rToken);
    void push_back(CToken&& rToken);
    void pop_back();

    void insert(const CToken& rToken);
    void insert(CToken&& rToken);
    template<class... Args>
    CToken& emplace_back(Args&&... args);

private:
    mutable std::list<CToken>::iterator     m_itCurrent;
};

template<class... Args>
CToken& CTokenList::emplace_back(Args&&... args)
{
    bool bEmpty = empty();
    bool bEnd = bEmpty || m_itCurrent == end();
    CToken& rToken = std::list<CToken>::emplace_back(args...);
    if (bEmpty) m_itCurrent = begin();
    else if (bEnd)
    {
        m_itCurrent = end();
        --m_itCurrent;
    }
    return rToken;
}

#endif // !defined(TOKENLIST_H)