Class CDataStream

src/streams.h:185–365

Double ended buffer combining vector and stream-like interfaces. * * >> and << read and write unformatted data using the above serialization templates. * Fills with data in linear time; some stringstream implementations take N^2 time. */

 * Fills with data in linear time; some stringstream implementations take N^2 time.
 */
class CDataStream
{
protected:
    using vector_type = SerializeData;
    vector_type vch;
    vector_type::size_type m_read_pos{0};

    int nType;
    int nVersion;

public:
    typedef vector_type::allocator_type   allocator_type;
    typedef vector_type::size_type        size_type;
    typedef vector_type::difference_type  difference_type;
    typedef vector_type::reference        reference;
    typedef vector_type::const_reference  const_reference;
    typedef vector_type::value_type       value_type;
    typedef vector_type::iterator         iterator;
    typedef vector_type::const_iterator   const_iterator;
    typedef vector_type::reverse_iterator reverse_iterator;

    explicit CDataStream(int nTypeIn, int nVersionIn)
        : nType{nTypeIn},
          nVersion{nVersionIn} {}

    explicit CDataStream(Span<const uint8_t> sp, int type, int version) : CDataStream{AsBytes(sp), type, version} {}
    explicit CDataStream(Span<const value_type> sp, int nTypeIn, int nVersionIn)
        : vch(sp.data(), sp.data() + sp.size()),
          nType{nTypeIn},
          nVersion{nVersionIn} {}

    template <typename... Args>
    CDataStream(int nTypeIn, int nVersionIn, Args&&... args)
        : nType{nTypeIn},
          nVersion{nVersionIn}
    {
        ::SerializeMany(*this, std::forward<Args>(args)...);
    }

    std::string str() const
    {
        return std::string{UCharCast(data()), UCharCast(data() + size())};
    }


    //
    // Vector subset
    //
    const_iterator begin() const                     { return vch.begin() + m_read_pos; }
    iterator begin()                                 { return vch.begin() + m_read_pos; }
    const_iterator end() const                       { return vch.end(); }
    iterator end()                                   { return vch.end(); }
    size_type size() const                           { return vch.size() - m_read_pos; }
    bool empty() const                               { return vch.size() == m_read_pos; }
    void resize(size_type n, value_type c = value_type{}) { vch.resize(n + m_read_pos, c); }
    void reserve(size_type n)                        { vch.reserve(n + m_read_pos); }
    const_reference operator[](size_type pos) const  { return vch[pos + m_read_pos]; }
    reference operator[](size_type pos)              { return vch[pos + m_read_pos]; }