use of ' this() ' keyword in ctor design

  • Thread starter Thread starter hazz
  • Start date Start date
H

hazz

will the third ctor in this class call the first two or just the null ctor?

public class B {
public B() { ... }
public B(string str) {.....}
public B(Token tkn, string str, int int_var) : this() { ... }
}

can I add an argument to this(str) and do the following so that ctor #3 does
call ctor#2 ?

public class B {
public B() { ... }
public B(string str) {.....}
public B(Token tkn, string str, int int_var) : this(str) { ... }
}

thank you, -greg
 
hazz said:
will the third ctor in this class call the first two or just the null
ctor?

public class B {
public B() { ... }
public B(string str) {.....}
public B(Token tkn, string str, int int_var) : this() { ... }
Click to expand...

this() calls only the constuctor with no arguments.
}

can I add an argument to this(str) and do the following so that ctor #3
does
call ctor#2 ?

public class B {
public B() { ... }
public B(string str) {.....}
public B(Token tkn, string str, int int_var) : this(str) { ... }
}
Click to expand...

Yes, that's exactly how you do it.
 
hazz said:
will the third ctor in this class call the first two or just the null ctor?

public class B {
public B() { ... }
public B(string str) {.....}
public B(Token tkn, string str, int int_var) : this() { ... }
}
Click to expand...

It will just call the null constructor (public B())
can I add an argument to this(str) and do the following so that ctor #3 does
call ctor#2 ?

public class B {
public B() { ... }
public B(string str) {.....}
public B(Token tkn, string str, int int_var) : this(str) { ... }
}
Click to expand...

Yes, in this case, ctor #2 is executed first then ctor #3 is executed - ctor
#1 is not executed
 
hazz said:
will the third ctor in this class call the first two or just the null ctor?
Click to expand...

It will call the one that matches the parameters you supplied, so the
zero param constructor.
public class B {
public B() { ... }
public B(string str) {.....}
public B(Token tkn, string str, int int_var) : this() { ... }
}

can I add an argument to this(str) and do the following so that ctor #3 does
call ctor#2 ?
Yes

public class B {
public B() { ... }
public B(string str) {.....}
public B(Token tkn, string str, int int_var) : this(str) { ... }
}

thank you, -greg
Click to expand...


JB
 
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