what is this pointer in c++
Every object in C++ has access to its own address through an important pointer called this pointer.
The this pointer is an implicit parameter to all member functions.
Therefore, inside a member function, this may be used to refer to the invoking object.
Example:
#include <iostream>
using namespace std;
class Demo {
private:
int num;
char ch;
public:
void setMyValues(int num, char ch){
this->num =num;
this->ch=ch;
}
void displayMyValues(){
cout<<num<<endl;
cout<<ch;
}
};
int main(){
Demo obj;
obj.setMyValues(100, 'A');
obj.displayMyValues();
return 0;
}
4.33
3
#include <iostream>
using namespace std;
// isualize this on http://pythontutor.com/cpp.html#mode=edit
int main()
{
double* account_pointer = new double;
*account_pointer = 1000;
cout << "Allocated one new variable containing " << *account_pointer
<< endl;
cout << endl;
int n = 10;
double* account_array = new double[n];
for (int i = 0; i < n; i++)
{
account_array[i] = 1000 * i;
}
cout << "Allocated an array of size " << n << endl;
for (int i = 0; i < n; i++)
{
cout << i << ": " << account_array[i] << endl;
}
cout << endl;
// Doubling the array capacity
double* bigger_array = new double[2 * n];
for (int i = 0; i < n; i++)
{
bigger_array[i] = account_array[i];
}
delete[] account_array; // Deleting smaller array
account_array = bigger_array;
n = 2 * n;
cout << "Now there is room for an additional element:" << endl;
account_array[10] = 10000;
cout << 10 << ": " << account_array[10] << endl;
delete account_pointer;
delete[] account_array; // Deleting larger array
return 0;
}
Thank you!
3
0
4.1
10
#include <iostream>
using namespace std;
int main () {
int var = 20; // actual variable declaration.
int *ip; // pointer variable
ip = &var; // store address of var in pointer variable
cout << "Value of var variable: ";
cout << var << endl; //Prints "20"
// print the address stored in ip pointer variable
cout << "Address stored in ip variable: ";
cout << ip << endl; //Prints "b7f8yufs78fds"
// access the value at the address available in pointer
cout << "Value of *ip variable: ";
cout << *ip << endl; //Prints "20"
return 0;
}
Thank you!
10
0
4.2
5
// my first pointer
#include <iostream>
using namespace std;
int main ()
{
int firstvalue, secondvalue;
int * mypointer; //creates pointer variable of type int
mypointer = &firstvalue;
*mypointer = 10;
mypointer = &secondvalue;
*mypointer = 20;
cout << "firstvalue is " << firstvalue << '\n'; //firstvalue is 10
cout << "secondvalue is " << secondvalue << '\n'; //secondvalue is 20
return 0;
}
Thank you!
5
0
0
0
Every object in C++ has access to its own address through an important pointer called this pointer.
The this pointer is an implicit parameter to all member functions.
Therefore, inside a member function,
this may be used to refer to the invoking object.
Friend functions do not have a this pointer,
because friends are not members of a class.
Only member functions have a this pointer.
Thank you!
0
0
3
1
void one() { cout << "One\n"; }
void two() { cout << "Two\n"; }
int main()
{
void (*fptr)(); //Declare a function pointer to voids with no params
fptr = &one; //fptr -> one
*fptr(); //=> one()
fptr = &two; //fptr -> two
*fptr(); //=> two()
return 0;
}
Thank you!
1
0
Are there any code examples left?
New code examples in category C++