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Steve Chow
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 Posted: Mon Sep 11, 2006 9:10 am Post subject: quick questions |
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i haven't seen these in any tutorials or anything i've read so i'm
wondering if someone could tell me what they're called so i can
research them.
i've only seen functions like
animal.make_noise("fart");
but the other day i ran into something like
animal.sounds().make_noise("fart");
is there a name for calling multiple functions like this? |
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Stuart Redmann
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| Posted: Mon Sep 11, 2006 9:10 am Post subject: Re: quick questions |
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Steve Chow wrote:
| Quote: | i haven't seen these in any tutorials or anything i've read so i'm
wondering if someone could tell me what they're called so i can
research them.
i've only seen functions like
animal.make_noise("fart");
but the other day i ran into something like
animal.sounds().make_noise("fart");
is there a name for calling multiple functions like this?
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It's not that two methods sounds () and make_noise (...) are called for
the animal object, but rather only sounds (). This method would return
another object that we don't know (at least I guess this, else the code
wouldn't compile or make sense). For this object the method
make_noise(...) is called.
As far as I know there is no special name for such a mechanism. If
sounds () were a method that returned the animal object, this would be
called 'call chaining'. This is used for reading and writing formatted
data with IO streams. Consider for example operator<< for streams. Using
this you can write statements like
cout << "Some text" << iSomeNumber << "AnotherText";
This statement could be written as
cout << "Some text";
cout << iSomeNumber;
cout << "AnotherText";
Since it would be tedious to repeat 'cout << ' over and over again, the
operator<< for streams should output the argument and return the stream.
Regards,
Stuart |
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Jens Theisen
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| Posted: Mon Sep 11, 2006 9:10 am Post subject: Re: quick questions |
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"Steve Chow" <msweaksauce (AT) hotmail (DOT) com> writes:
| Quote: | animal.sounds().make_noise("fart");
is there a name for calling multiple functions like this?
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No, but there is also nothing special about it.
animial has a member function sounds, which returns some object x
which has in turn a member function make_noise taking a string.
The above line could happily be java with the same semantics.
Cheers,
Jens |
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