55 lines
1.6 KiB
C++
55 lines
1.6 KiB
C++
/*
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* Copyright (C) 2014 Cloudius Systems, Ltd.
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*/
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#ifndef UTIL_FUNCTION_INPUT_ITERATOR_HH_
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#define UTIL_FUNCTION_INPUT_ITERATOR_HH_
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template <typename Function, typename State>
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struct function_input_iterator {
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Function _func;
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State _state;
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public:
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function_input_iterator(Function func, State state)
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: _func(func), _state(state) {
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}
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function_input_iterator(const function_input_iterator&) = default;
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function_input_iterator(function_input_iterator&&) = default;
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function_input_iterator& operator=(const function_input_iterator&) = default;
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function_input_iterator& operator=(function_input_iterator&&) = default;
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auto operator*() const {
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return _func();
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}
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function_input_iterator& operator++() {
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++_state;
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return *this;
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}
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function_input_iterator operator++(int) {
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function_input_iterator ret{*this};
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++_state;
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return ret;
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}
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bool operator==(const function_input_iterator& x) const {
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return _state == x._state;
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}
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bool operator!=(const function_input_iterator& x) const {
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return !operator==(x);
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}
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};
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template <typename Function, typename State>
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inline
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function_input_iterator<Function, State>
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make_function_input_iterator(Function func, State state) {
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return function_input_iterator<Function, State>(func, state);
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}
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template <typename Function, typename State>
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inline
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function_input_iterator<Function, State>
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make_function_input_iterator(Function&& func) {
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return function_input_iterator<Function, State>(func, State{});
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}
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#endif /* UTIL_FUNCTION_INPUT_ITERATOR_HH_ */
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