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https://github.com/libretro/bsnes-libretro.git
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76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
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#pragma once
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namespace nall {
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template<typename T> struct iterator {
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iterator(T* self, uint offset) : self(self), offset(offset) {}
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auto operator*() -> T& { return self[offset]; }
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auto operator!=(const iterator& source) const -> bool { return offset != source.offset; }
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auto operator++() -> iterator& { return offset++, *this; }
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private:
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T* self;
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uint offset;
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};
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template<typename T> struct iterator_const {
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iterator_const(const T* self, uint offset) : self(self), offset(offset) {}
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auto operator*() -> const T& { return self[offset]; }
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auto operator!=(const iterator_const& source) const -> bool { return offset != source.offset; }
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auto operator++() -> iterator_const& { return offset++, *this; }
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private:
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const T* self;
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uint offset;
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};
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template<typename T> struct reverse_iterator {
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reverse_iterator(T* self, uint offset) : self(self), offset(offset) {}
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auto operator*() -> T& { return self[offset]; }
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auto operator!=(const reverse_iterator& source) const -> bool { return offset != source.offset; }
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auto operator++() -> reverse_iterator& { return offset--, *this; }
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private:
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T* self;
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uint offset;
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};
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template<typename T> struct reverse_iterator_const {
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reverse_iterator_const(const T* self, uint offset) : self(self), offset(offset) {}
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auto operator*() -> const T& { return self[offset]; }
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auto operator!=(const reverse_iterator_const& source) const -> bool { return offset != source.offset; }
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auto operator++() -> reverse_iterator_const& { return offset--, *this; }
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private:
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const T* self;
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uint offset;
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};
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//std::rbegin(), std::rend() is missing from GCC 4.9; which I still target
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template<typename T, uint Size> auto rbegin(T (&array)[Size]) { return reverse_iterator<T>{array, Size - 1}; }
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template<typename T, uint Size> auto rend(T (&array)[Size]) { return reverse_iterator<T>{array, (uint)-1}; }
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template<typename T> auto rbegin(T& self) { return self.rbegin(); }
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template<typename T> auto rend(T& self) { return self.rend(); }
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template<typename T> struct reverse_wrapper {
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T self;
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auto begin() { return rbegin(self); }
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auto end() { return rend(self); }
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auto begin() const { return rbegin(self); }
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auto end() const { return rend(self); }
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};
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template<typename T> auto reverse(T& object) -> reverse_wrapper<T&> {
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return {object};
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}
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template<typename T> auto reverse(T&& object) -> reverse_wrapper<T> {
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return {object};
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}
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}
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