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1 object=another_object; //赋值重载 2 Person object=another_object; //拷贝构造函数。 3 Person object(another_object);
//开辟堆空间
1 Person obj; 2 Person* p=new Person(obj); //编辑器会调用拷贝构造函数。 delete p;
3. 构造函数
1 Person(Person _p) 2 { 3 cout<<”拷贝”<<endl; 4 }//会导致程序陷入死循环。 5 修改： 6 Person(const Person& _p) 7 { 8 }
1 Vector(int*,int) 2 int a[5]={} 3 Vector(a,5);
7. 源码：
1 #include <iostream> 2 #include "cstring" 3 using namespace std; 4 5 class Vector 6 { 7 public: 8 Vector(int s=0); 9 Vector(int*,int); 10 Vector(const Vector& v); 11 ~Vector(){dispose();} 12 int get_size()const{return size;} 13 Vector& operator=(const Vector& x); 14 int & operator[](int index){return rep[index];} 15 const int & operator[](int index)const{return rep[index];} 16 friend ostream& operator<<(ostream& out,Vector& x); 17 18 private: 19 int* rep; 20 int size; 21 void clone(const Vector& a); 22 void dispose(); 23 }; 24 void Vector::clone(const Vector& a) 25 { 26 (*this).size=a.size; 27 rep=new int[a.get_size()+1]; 28 for (int i=0; i<size; i++) { 29 rep[i]=a[i]; 30 } 31 } 32 void Vector::dispose() 33 { 34 delete [] rep; 35 } 36 Vector::Vector(int s):size(s) 37 { 38 if (size<=0) { 39 rep=NULL; 40 } 41 else{ 42 rep=new int [size]; 43 for (int i=0; i<size; i++) { 44 rep[i]=0; 45 } 46 } 47 } 48 Vector::Vector(int* a,int s):rep(new int[s]),size(s) 49 { 50 for (int i=0; i<size; ++i) { 51 rep[i]=a[i]; 52 } 53 } 54 Vector::Vector (const Vector& v) 55 { 56 clone(v); 57 } 58 Vector& Vector::operator=(const Vector& x) 59 { 60 if (this!=&x) { 61 delete [] rep; 62 this->size=x.size; 63 rep=new int[size]; 64 for (int i=0; i<size; ++i) { 65 rep[i]=x[i]; 66 } 67 } 68 return *this; 69 } 70 ostream& operator<<(ostream& out,Vector& x) 71 { 72 int s=x.get_size(); 73 for (int i=0; i<s; i++) { 74 out<<x[i]<<" "; 75 } 76 out<<endl; 77 return out; 78 } 79 bool operator==(const Vector& a,const Vector & b) 80 { 81 bool yes=true; 82 if (a.get_size()!=b.get_size()) { 83 yes=false; 84 } 85 else 86 { 87 int s,index=0; 88 s=a.get_size(); 89 while (index<s&&a[index]==b[index]) { 90 ++index; 91 } 92 if (index<s) { 93 yes=false; 94 } 95 } 96 return yes; 97 } 98 int main(int argc, const char * argv[]){ 99 int a[5]={3,2,4,2,8}; 100 int b[3]={2,4,3}; 101 Vector v1(a,5); 102 cout<<v1; 103 Vector v2(b,3); 104 cout<<v2; 105 if (v1==v2) { 106 cout<<"v1,v2不等！"; 107 } 108 else 109 cout<<"v1,v2相等"; 110 cout<<endl; 111 Vector v3=v2; 112 cout<<v3; 113 return 0; 114 }
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原文地址：http://www.cnblogs.com/cai1432452416/p/5218514.html
