C++/Class/this — различия между версиями
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Версия 14:21, 25 мая 2010
how the this class pointer works
#include <iostream>
using namespace std;
class MyClass {
int i;
public:
void load_i(int val) { this->i = val; }
int get_i(void) { return this->i; }
};
main(void){
MyClass o;
o.load_i(100);
cout << o.get_i();
return 0;
}
this points yourself
#include <iostream>
#include <string.h>
using namespace std;
class SomeClass
{
public:
void show_with_this(void)
{
cout << "Book: " << this->title << endl;
cout << "Author: " << this->author << endl;
};
void show_without_this(void)
{
cout << "Book: " << title << endl;
cout << "Author: " << author << endl;
};
SomeClass(char *title, char *author)
{
strcpy(SomeClass::title, title);
strcpy(SomeClass::author, author);
};
private:
char title[256];
char author[256];
};
int main(void)
{
SomeClass book("A", "B");
book.show_with_this();
book.show_without_this();
}
Using the this pointer to refer to object members.
#include <iostream>
using std::cout;
using std::endl;
class Test {
public:
Test( int = 0 );
void print() const;
private:
int x;
};
Test::Test( int a ) { x = a; }
void Test::print() const
{
cout << " x = " << x
<< "\n this->x = " << this->x
<< "\n(*this).x = " << ( *this ).x << endl;
}
int main()
{
Test testObject( 12 );
testObject.print();
return 0;
}