C++: How to access member variables inside a member function
Author
Hi,
I've got a little problem.
I'm coming from the Java development, and there, I'm used to create a class with a member variable. The constructor has an argument with the same name. In the constructor, I make this argument to a member variable.
Like this.
class Blabla
int variable;
void Blabla(int variable){
this.variable = variable;
}
}
Is there something similar to the "this." Keyword in C++?
I know, normally, you write m_ before the variable. But somehow, I don't like that style. I just want to point in which focus the variable is, that I address.
Quote:Original post by Felix Ullrich
Hi,
I've got a little problem.
I'm coming from the Java development, and there, I'm used to create a class with a member variable. The constructor has an argument with the same name. In the constructor, I make this argument to a member variable.
Like this.
class Blabla
int variable;
void Blabla(int variable){
this.variable = variable;
}
}
Is there something similar to the "this." Keyword in C++?
I know, normally, you write m_ before the variable. But somehow, I don't like that style. I just want to point in which focus the variable is, that I address.
Yes, there is "this" keyword in C++. However, this is a pointer, so you should use the "arrow" sign instead of the "dot" sign to access your member variables.
class Blaba {
int variable;
Blabla(int variable) {
this->variable = variable;
}
};
C++ has the this keyword, however since it's a pointer to the current object you need to do this->variable and use the '->' operator as opposed to the '.' operator, which is used for value or reference types.
EDIT: Damn ninjas [razz]
EDIT: Damn ninjas [razz]
Quote:Original post by Felix Ullrich
void Blabla(int variable){
this.variable = variable;
}
Constructors don't return anything, not even void. And the idiomatic C++ way to initialize member variables is to, well... initialize them instead of assigning them (after default initialization).
Blabla(int variable) : variable(variable) {}The thing after the colon is called an "initialization list". Google it. It's cool.
Author
Thanks a whole lot.
The arrow was what I needed. But this initialization list is just gorgeous. Thanks a lot for this.
I hope, the questions will be somewhat more advanced in time ;)
The arrow was what I needed. But this initialization list is just gorgeous. Thanks a lot for this.
I hope, the questions will be somewhat more advanced in time ;)
you dont need a pointer to the current object to get access to a member variable. also there are different ways to get an object of a class.... the simpliest way is the following...
also if you want to use your point:
(*this).bar;
i thought java has pointers too?
or maybe
foo::bar;
the best you can do, is to use seperate function arguments or "::" or to learn C.
class foo{private: int bar;public: void foobar();}void foo::foobar(){ std::cout<<bar<<std::endl;}also if you want to use your point:
(*this).bar;
i thought java has pointers too?
or maybe
foo::bar;
the best you can do, is to use seperate function arguments or "::" or to learn C.
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