重载下标运算符

来源：互联网发布：同花顺软件加盟编辑：程序博客网时间：2024/05/16 19:39

自己实现一个动态分配的数组类。

代码如下：

class Array{public:Array();virtual ~Array();int & operator[](size_t x);const int& operator[](size_t x) const;protected:static const size_t kAllocSize = 4;void resize(size_t newSize);void initializeElements();int *mElems;size_t mSize;private:Array(const Array& src);Array& operator=(const Array& rhs);};

#include "Array.h"#include <stdexcept>using namespace std;Array::Array(){mSize = kAllocSize;mElems = new int[mSize];initializeElements();}Array::~Array(){delete[] mElems;mElems = nullptr;}void Array::resize(size_t newSize){int *oldElems = mElems;size_t oldSize = mSize;mSize = newSize;mElems = new int[newSize];initializeElements();for (size_t i = 0; i < oldSize; ++i) {mElems[i] = oldElems[i];}delete [] oldElems;}int &Array::operator[](size_t x){if (x < 0) {throw out_of_range("");}if (x >= mSize) {resize(x + kAllocSize);}return mElems[x];}const int &Array::operator[](size_t x) const{if (x < 0 || x >= mSize) {throw out_of_range("");}return mElems[x];}

0 0