错误 C2280 “CRectGraph &CRectGraph::operator =(const CRectGraph &)”: 尝试引用已删除的函数
时间: 2024-05-17 21:13:02 浏览: 21
这个错误通常是由于类中包含了禁止复制的成员(例如指针)而导致的。在这种情况下,编译器会自动生成一个默认的复制构造函数和赋值运算符重载函数,但是由于该类中包含了禁止复制的成员,所以这些默认函数会被删除。为了解决这个问题,你需要自己实现复制构造函数和赋值运算符重载函数,以便在复制对象时正确地处理这些成员。另外,你也可以考虑使用智能指针等工具来避免这个问题。
相关问题
填充下面这个程序中所有出现// TODO: fill the code这个任务的地方#include <iostream> #include <cstring> #include "ourstring.h" #include "strlib.h" using namespace std; OurString::OurString(){ // TODO: fill the code } OurString::OurString(const char *str){ // TODO: fill the code } OurString::OurString(const OurString &dstr){ // TODO: fill the code } OurString::~OurString(){ // TODO: fill the code } string OurString::toString() const{ // TODO: fill the code } OurString OurString::subStr(unsigned int start, unsigned int n) const{ // TODO: fill the code } bool OurString::operator > (const OurString &dstr) const{ // TODO: fill the code } bool OurString::operator < (const OurString &dstr) const{ // TODO: fill the code } bool OurString::operator == (const OurString &dstr) const{ // TODO: fill the code } unsigned int OurString::length () const{ // TODO: fill the code } const OurString& OurString::operator = (const OurString &dstr){ // TODO: fill the code } const OurString& OurString::operator = (const char *str){ // TODO: fill the code } char& OurString::operator[](int index){ // TODO: fill the code } const OurString OurString::operator + (const OurString &dstr) const{ // TODO: fill the code } const OurString OurString::operator + (const char *str) const{ // TODO: fill the code } const OurString& OurString::operator += (const OurString &dstr){ // TODO: fill the code } const OurString& OurString::operator += (const char *str){ // TODO: fill the code } ostream & operator<<(ostream &os, const OurString &dstr){ // TODO: fill the code } istream & operator>>(istream &is, OurString &dstr){ // TODO: fill the code }
好的,下面是填充后的代码,每个 TODO 已经被替换成相应的实现:
```c++
#include <iostream>
#include <cstring>
#include "ourstring.h"
#include "strlib.h"
using namespace std;
OurString::OurString(){
str = new char[1];
str[0] = '\0';
}
OurString::OurString(const char *str){
this->str = new char[strlen(str)+1];
strcpy(this->str, str);
}
OurString::OurString(const OurString &dstr){
this->str = new char[dstr.length()+1];
strcpy(this->str, dstr.str);
}
OurString::~OurString(){
delete [] str;
}
string OurString::toString() const{
return string(str);
}
OurString OurString::subStr(unsigned int start, unsigned int n) const{
if (start >= length()) return OurString();
n = (n > length() - start) ? length() - start : n;
return OurString(str + start, str + start + n);
}
bool OurString::operator > (const OurString &dstr) const{
return strcmp(str, dstr.str) > 0;
}
bool OurString::operator < (const OurString &dstr) const{
return strcmp(str, dstr.str) < 0;
}
bool OurString::operator == (const OurString &dstr) const{
return strcmp(str, dstr.str) == 0;
}
unsigned int OurString::length () const{
return strlen(str);
}
const OurString& OurString::operator = (const OurString &dstr){
if (this != &dstr) {
delete [] str;
str = new char[dstr.length()+1];
strcpy(str, dstr.str);
}
return *this;
}
const OurString& OurString::operator = (const char *str){
if (this->str != str) {
delete [] this->str;
this->str = new char[strlen(str)+1];
strcpy(this->str, str);
}
return *this;
}
char& OurString::operator[](int index){
return str[index];
}
const OurString OurString::operator + (const OurString &dstr) const{
OurString s;
s.str = new char[length() + dstr.length() + 1];
strcpy(s.str, str);
strcat(s.str, dstr.str);
return s;
}
const OurString OurString::operator + (const char *str) const{
OurString s;
s.str = new char[length() + strlen(str) + 1];
strcpy(s.str, this->str);
strcat(s.str, str);
return s;
}
const OurString& OurString::operator += (const OurString &dstr){
*this = *this + dstr;
return *this;
}
const OurString& OurString::operator += (const char *str){
*this = *this + str;
return *this;
}
ostream & operator<<(ostream &os, const OurString &dstr){
os << dstr.str;
return os;
}
istream & operator>>(istream &is, OurString &dstr){
string s;
is >> s;
dstr = s.c_str();
return is;
}
```
std::ostream& A::operator<<
这是C++中的一个运算符重载函数,用于将对象A插入到输出流中。该函数应该返回一个std::ostream类型的引用,以便可以使用链式语法进行输出。例如:
```
A a;
std::cout << a << std::endl;
```
在这个例子中,运算符<<被重载为A类的成员函数,返回std::ostream类型的引用,使得可以将对象a输出到标准输出流中,并在最后加上一个换行符。
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