75 lines
1.9 KiB
C++
75 lines
1.9 KiB
C++
#ifndef __LIST_INCLUDE_H_
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#define __LIST_INCLUDE_H_
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#include "lib/OutStream.h"
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// Define the list interface for ArrayList/LinkedList implementations with support for Iterators/ranged based for loops
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// TODO: Does it only work on lists?
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// This iterator works for structures where the elements are adjacent in memory.
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// For things like LinkedList, the operator++ has to be overriden to implement the traversal.
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template<typename T>
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class ListIterator {
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private:
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T* ptr;
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public:
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ListIterator(T* ptr) : ptr(ptr) {}
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// I only implement the least necessary operators
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ListIterator& operator++() {
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this->ptr = this->ptr + 1;
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return *this;
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}
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T* operator->() {
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return this->ptr;
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}
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T& operator*() {
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return *this->ptr;
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}
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bool operator==(const ListIterator& other) const {
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return this->ptr == other.ptr;
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}
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bool operator!=(const ListIterator& other) const {
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return !(*this == other); // Use our == implementation
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}
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};
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template<typename T, typename I = ListIterator<T>>
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class List {
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public:
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using Type = T; // We make the template argument accessible from the subclasses
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using Iterator = I; // Needed for range based for loop
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protected:
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virtual Type* begin_ptr() = 0;
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virtual Type* end_ptr() = 0;
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public:
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Iterator begin() { return Iterator(this->begin_ptr()); }
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Iterator end() { return Iterator(this->end_ptr()); }
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virtual unsigned int insert(Type e) = 0;
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virtual unsigned int insert_at(Type e, unsigned int i) = 0;
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virtual Type remove_at(unsigned int i) = 0;
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virtual Type remove_first() = 0;
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virtual Type remove_last() = 0;
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virtual bool remove(Type e) = 0;
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virtual Type get(unsigned int i) const = 0;
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virtual Type first() const = 0;
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virtual Type last() const = 0;
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virtual bool empty() const = 0;
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virtual unsigned int size() const = 0;
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virtual void print(OutStream& out) const = 0;
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};
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#endif
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