67 lines
1.3 KiB
C++
67 lines
1.3 KiB
C++
#pragma once
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#include "../ex_object.h"
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// 基本
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void base();
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// 自定义一个简单的智能指针
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template <typename T>
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class MSmartPointer {
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private:
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T* ptr;
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size_t* refCount;
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public:
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MSmartPointer() : ptr(nullptr), refCount(nullptr) {}
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explicit MSmartPointer(T* p) : ptr(p), refCount(new size_t(1)) {}
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// 拷贝构造函数
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MSmartPointer(const MSmartPointer& other)
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: ptr(other.ptr), refCount(other.refCount)
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{
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if (!refCount) {
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return;
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}
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++(*refCount);
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}
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// 析构函数
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~MSmartPointer()
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{
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if (refCount && --(*refCount) <= 0) {
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delete ptr;
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delete refCount;
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ptr = nullptr;
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refCount = nullptr;
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}
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}
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// 重载赋值操作符
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MSmartPointer& operator=(const MSmartPointer& other)
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{
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if (this == &other) {
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return *this;
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}
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if (refCount && --(*refCount) <= 0) {
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delete ptr;
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delete refCount;
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}
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ptr = other.ptr;
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refCount = other.refCount;
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if (refCount) {
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++(*refCount);
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}
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return *this;
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}
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T& operator*() const { return *ptr; }
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T* operator->() const { return ptr; }
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};
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// 测试用例
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void test_example(); |