mirror of https://github.com/bsnes-emu/bsnes.git
54 lines
1.3 KiB
C++
54 lines
1.3 KiB
C++
#ifndef NALL_RANGE_HPP
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#define NALL_RANGE_HPP
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namespace nall {
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struct range_t {
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struct iterator {
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iterator(signed position, signed step = 0) : position(position), step(step) {}
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auto operator*() const -> signed { return position; }
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auto operator!=(const iterator& source) const -> bool { return step > 0 ? position < source.position : position > source.position; }
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auto operator++() -> iterator& { position += step; return *this; }
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private:
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signed position;
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const signed step;
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};
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auto begin() const -> const iterator { return iterator(origin, stride); }
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auto end() const -> const iterator { return iterator(target); }
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signed origin;
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signed target;
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signed stride;
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};
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inline auto range(signed size) {
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return range_t{0, size, 1};
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}
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inline auto range(signed offset, signed size) {
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return range_t{offset, size, 1};
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}
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inline auto range(signed offset, signed size, signed step) {
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return range_t{offset, size, step};
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}
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//reverse-range
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inline auto rrange(signed size) {
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return range_t{size - 1, -1, -1};
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}
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template<typename T> inline auto range(const vector<T>& container) {
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return range_t{0, (signed)container.size(), 1};
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}
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template<typename T> inline auto rrange(const vector<T>& container) {
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return range_t{(signed)container.size() - 1, -1, -1};
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}
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}
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#endif
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