forked from OctaForge/libostd
110 lines
2.8 KiB
C++
110 lines
2.8 KiB
C++
/* Ranges for OctaSTD.
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*
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* This file is part of OctaSTD. See COPYING.md for futher information.
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*/
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#ifndef OCTA_RANGE_H
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#define OCTA_RANGE_H
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#include <stddef.h>
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#include "octa/types.h"
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namespace octa {
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template<typename T>
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struct RangeTraits {
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typedef typename T::type::difference difference;
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typedef typename T::type::value value;
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typedef typename T::type::pointer pointer;
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typedef typename T::type::reference reference;
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};
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template<typename T>
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struct RangeTraits<T *> {
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typedef ptrdiff_t difference;
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typedef T value;
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typedef T *pointer;
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typedef T &reference;
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};
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template<typename T>
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struct RangeTraits<const T *> {
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typedef ptrdiff_t difference;
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typedef T value;
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typedef const T *pointer;
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typedef const T &reference;
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};
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template<>
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struct RangeTraits<void *> {
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typedef ptrdiff_t difference;
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typedef uchar value;
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typedef void *pointer;
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typedef uchar &reference;
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};
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template<>
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struct RangeTraits<const void *> {
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typedef ptrdiff_t difference;
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typedef uchar value;
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typedef const void *pointer;
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typedef const uchar &reference;
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};
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template<typename T>
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class RangeIterator {
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T p_range;
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public:
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struct type {
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typedef typename RangeTraits<T>::difference difference;
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typedef typename RangeTraits<T>::value value;
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typedef typename RangeTraits<T>::pointer pointer;
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typedef typename RangeTraits<T>::reference reference;
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};
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RangeIterator(): p_range() {}
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RangeIterator(const T &range): p_range(range) {}
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template<typename U>
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RangeIterator(const RangeIterator<U> &it): p_range(it.range()) {}
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T range() const { return p_range; }
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RangeIterator &operator++() {
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p_range.pop_first();
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return *this;
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}
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typename type::reference operator*() {
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return p_range.first();
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}
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template<typename U>
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friend bool operator!=(const RangeIterator &a, const RangeIterator<U> &b) {
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return a.range() != b.range();
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}
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};
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template<template<typename> class T, typename U>
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struct Range {
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RangeIterator<T<U>> begin() {
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return RangeIterator<T<U>>((const T<U> &)*this);
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}
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RangeIterator<T<U>> end() {
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return RangeIterator<T<U>>();
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}
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template<typename V>
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friend bool operator==(const T<U> &a, const T<V> &b) {
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return a.equals(b);
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}
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template<typename V>
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friend bool operator!=(const T<U> &a, const T<V> &b) {
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return !a.equals(b);
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}
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};
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}
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#endif |