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https://github.com/OpenVPN/openvpn3.git
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f25c9b37ef
Misc cleanup.
101 lines
1.9 KiB
C++
101 lines
1.9 KiB
C++
#ifndef OPENVPN_COMMON_CIRC_LIST_H
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#define OPENVPN_COMMON_CIRC_LIST_H
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#include <vector>
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#include <openvpn/common/types.hpp>
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#include <openvpn/common/exception.hpp>
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namespace openvpn {
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template <typename T>
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class CircList
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{
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public:
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OPENVPN_SIMPLE_EXCEPTION(circ_list_reset);
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OPENVPN_SIMPLE_EXCEPTION(circ_list_index);
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OPENVPN_SIMPLE_EXCEPTION(circ_list_const_index);
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OPENVPN_SIMPLE_EXCEPTION(circ_list_push);
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CircList() { init(0); }
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explicit CircList(const size_t capacity) { init(capacity); }
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void init(const size_t capacity)
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{
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if (capacity)
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{
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data_.reserve(capacity);
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capacity_ = capacity;
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reset();
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}
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else
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{
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head_ = capacity_ = 0;
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data_.clear();
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}
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}
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void reset()
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{
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if (capacity_)
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{
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head_ = capacity_ - 1;
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data_.clear();
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}
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else
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throw circ_list_reset();
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}
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size_t size() const
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{
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return data_.size();
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}
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bool defined() const
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{
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return capacity_ > 0;
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}
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void push(const T& item)
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{
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if (++head_ >= capacity_)
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head_ = 0;
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if (head_ < data_.size())
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data_[head_] = item;
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else if (head_ == data_.size() && data_.size() < capacity_)
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data_.push_back(item);
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else
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throw circ_list_push(); // could occur if object isn't properly initialized
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}
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T& operator[](const size_t index)
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{
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if (index >= data_.size())
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throw circ_list_index();
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else if (index <= head_)
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return data_[head_-index];
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else
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return data_[head_+capacity_-index];
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}
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const T& operator[](const size_t index) const
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{
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if (index >= data_.size())
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throw circ_list_const_index();
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else if (index <= head_)
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return data_[head_-index];
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else
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return data_[head_+capacity_-index];
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}
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private:
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size_t capacity_;
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size_t head_;
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std::vector<T> data_;
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};
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} // namespace openvpn
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#endif // OPENVPN_COMMON_CIRC_LIST_H
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