Is there a method similar to toString, equals in java?

luoyan

Ask 3 big questions:

1. Does c ++ have toString, equals, etc.?
2. Does C ++ have an orm framework? Is there a spring framework in java?
3. Is there any serialization in the standard C ++ syntax? How to use it? What is the format for serializing to a file?

superandy

C ++ is not java.

jotoos

1,
struct object
{
virtual string toString ();
};

struct car: public object
{
virtual string toString () {return "car";}
bool operator == (const car&);
};

2,
never heard of that

3.
No, there is in MFC, you can refer to it. Standard C ++ can overload ostream << and istream >> to achieve similar functions.

reekee_max

Upstairs, LZ said tostring means.
int i = 1;
i.tostring () // "1"

Every data type exists in the form of a class in java.
Just implement a method yourself!

reekee_max

This can be done.
char szBuff [128] = {0};
sprintf (szBuff, "% s% n% c", "HI", 2, 'c');

int i = 1;
sprintf (szBuff, "% n", i); // "1"
This can barely achieve the same effect as java tostring!

xwx000000

Write your own ostream&operater << (ostream&o, [object]&obj);

then
stringstream sstrm;
sstrm << obj;

xwx000000

equals is equivalent to operator ==
The standard library does not specify the serialization format
I haven't seen the C ++ ORM framework because C ++ lacks a reflection mechanism, and it is very complicated to implement. I have tried it before, and it is really difficult to use it without the reflection mechanism, and finally gave up

zjwzjw

toString can be implemented with stingstream,
Or use sprintf in C,
Or other methods, such as itoa, etc.

such as:
    ostringstream os;
    os << 100 << endl;
    string str = os.str (); // Get string
    cout << str << endl;

zjwzjw

There are equals:

#include <string>
  bool operator == (const string&c1, const string&c2);

zjwzjw

#include <string>
  bool operator == (const string&c1, const string&c2);
  bool operator! = (const string&c1, const string&c2);
  bool operator <(const string&c1, const string&c2);
  bool operator> (const string&c1, const string&c2);
  bool operator <= (const string&c1, const string&c2);
  bool operator> = (const string&c1, const string&c2);
  string operator + (const string&s1, const string&s2);
  string operator + (const char * s, const string&s2);
  string operator + (char c, const string&s2);
  string operator + (const string&s1, const char * s);
  string operator + (const string&s1, char c);
  ostream&operator << (ostream&os, const string&s);
  istream&operator >> (istream&is, string&s);
  string&operator = (const string&s);
  string&operator = (const char * s);
  string&operator = (char ch);
  char&operator [] (size_type index);