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50 lines
1.9 KiB
50 lines
1.9 KiB
#pragma once
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#include <cassert>
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#include <vector>
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#include <string>
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namespace eth
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{
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template <class _T>
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class foreign
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{
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public:
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typedef _T value_type;
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typedef _T element_type;
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foreign(): m_data(nullptr), m_count(0) {}
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foreign(std::vector<typename std::remove_const<_T>::type>* _data): m_data(_data->data()), m_count(_data->size()) {}
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foreign(_T* _data, unsigned _count): m_data(_data), m_count(_count) {}
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explicit operator bool() const { return m_data && m_count; }
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std::vector<_T> toVector() const { return std::vector<_T>(m_data, m_data + m_count); }
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std::string toString() const { return std::string((char const*)m_data, ((char const*)m_data) + m_count); }
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template <class _T2> operator foreign<_T2>() const { assert(m_count * sizeof(_T) / sizeof(_T2) * sizeof(_T2) / sizeof(_T) == m_count); return foreign<_T2>((_T2*)m_data, m_count * sizeof(_T) / sizeof(_T2)); }
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_T* data() const { return m_data; }
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unsigned count() const { return m_count; }
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unsigned size() const { return m_count; }
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foreign<_T> next() const { return foreign<_T>(m_data + m_count, m_count); }
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foreign<_T> cropped(unsigned _begin, int _count = -1) const { if (m_data && _begin + std::max(0, _count) <= m_count) return foreign<_T>(m_data + _begin, _count < 0 ? m_count - _begin : _count); else return foreign<_T>(); }
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void retarget(_T const* _d, size_t _s) { m_data = _d; m_count = _s; }
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void retarget(std::vector<_T> const& _t) { m_data = _t.data(); m_count = _t.size(); }
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_T* begin() { return m_data; }
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_T* end() { return m_data + m_count; }
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_T const* begin() const { return m_data; }
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_T const* end() const { return m_data + m_count; }
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_T& operator[](unsigned _i) { assert(m_data); assert(_i < m_count); return m_data[_i]; }
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_T const& operator[](unsigned _i) const { assert(m_data); assert(_i < m_count); return m_data[_i]; }
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void reset() { m_data = nullptr; m_count = 0; }
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private:
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_T* m_data;
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unsigned m_count;
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};
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}
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