[.net] This?
Author
I feel a little stupid posting this here, but I can't seem to find out what the "this" statement does in c++;
Can anyone tell me ??
Thanx in advance
this is a pointer to the instance of the class it's used in.
EDIT: Also, what does this have to do with .NET?
EDIT: Also, what does this have to do with .NET?
this is a pointer to class object. For example:
Class Foo {
int a;
int b;
int c;
Foo(int a);
~Foo();
}
Foo::Foo(int a) {
this->a = 0;
this->b = a;
this->c = this->a;
}
The Foo constructor initializes its members a to 0, b to the value passed to it and c to 0. Hope the above helps.
Class Foo {
int a;
int b;
int c;
Foo(int a);
~Foo();
}
Foo::Foo(int a) {
this->a = 0;
this->b = a;
this->c = this->a;
}
The Foo constructor initializes its members a to 0, b to the value passed to it and c to 0. Hope the above helps.
'this' is a language keyword that resolves to the pointer of the current object. It is espeecially useful when resolving variables that have name collisions. Example:
Note however that the above example *SHOULD* not happen in real scenarios because variable names should be decided carefully to avoid ambiguous clashes.
class Foo{ private: int value; public: void ChangeValue( int value );};void Foo::Changevalue( int value ){ //value = value; <-- Which 'value' is assigned to which? // In the above, the function local scope takes precedence. So you're // only manipulating (pointlessly) the function parameter. this->value = value; // By using the 'this' reference, you specifically resolve to use the // class member and assign it the value of the incoming parameter.}Note however that the above example *SHOULD* not happen in real scenarios because variable names should be decided carefully to avoid ambiguous clashes.
Using this-> is pretty much redundant, unless you're using it to resolve ambiguities. Although I think that resolving ambiguities is done better by using different variable names to the class member names. e.g. appending m_ to the member variable name.
However using *this is often very useful. e.g.
Oh, and if you've ever used Pascal or Delphi, it's the same thing as self.
However using *this is often very useful. e.g.
inline bool operator > (const ubigint& q) const { return q < *this; }Oh, and if you've ever used Pascal or Delphi, it's the same thing as self.
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