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Bob
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 Posted: Sun Jul 30, 2006 9:37 pm Post subject: how to invoke a method in C++? |
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My first language is Java and am now transferring to C++. I have two
questions.
(1) In Java, we have a very good API documentation. However, I could
not find an equivalent for C++. I tried to use the MSDN documentation
accompanying Visual Studio 2005. But I found it is not so good as the
JDK documentation provided by Sun. For example, it is not easy to
distinguish from the documentation if a method in C++ is a static
method (invoked without an object), or the method is a instance method
(must be invoked by an object).
(2) The second question is actually the same as the first one. I don't
know in C++ when to invoke a method by an object (object.method()), and
when to invoke a method without an object (method()). Do you know how
to distinguish them? From the API provided by MSDN or elsewhere?
Thanks.
Bob
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Alf P. Steinbach
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| Posted: Sun Jul 30, 2006 11:37 pm Post subject: Re: how to invoke a method in C++? |
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* Bob:
| Quote: | My first language is Java and am now transferring to C++. I have two
questions.
(1) In Java, we have a very good API documentation.
|
In C++ we have even better! <g> And truth be told, also worse, because
in contrast to Java C++ is much based on using third-party libraries,
which aren't always perfectly documented. In short, be prepared for a
much more varied experience.
| Quote: | However, I could not find an equivalent for C++.
|
The C++ language and standard library is formally documented by the C++
standard. Which is not free, but the PDF version is US $18 or
thereabouts; you'll want the 2003 revision (technical corrigendum 1).
Also, Josutti's book on the standard library is generally recommended.
| Quote: | I tried to use the MSDN documentation
accompanying Visual Studio 2005.
|
That's also available online. Also perhaps check out the SGI STL online
documentation, and the Dinkumware stdandard library online documentation.
| Quote: | But I found it is not so good as the
JDK documentation provided by Sun. For example, it is not easy to
distinguish from the documentation if a method in C++ is a static
method (invoked without an object), or the method is a instance method
(must be invoked by an object).
|
A static member function is denoted by the word 'static'. In addition,
there are free-standing functions that are not class members.
| Quote: | (2) The second question is actually the same as the first one. I don't
know in C++ when to invoke a method by an object (object.method()), and
when to invoke a method without an object (method()). Do you know how
to distinguish them? From the API provided by MSDN or elsewhere?
|
Short determination algo:
if( f is a class member && f is not 'static' )
{
// An non-static member function, call it on an object.
// Well, except for constructors.
obj.f();
pObj->f();
}
else
{
// A freestanding function, no object.
if( f is a class member )
{
// A static member function, marked as 'static'.
ClassName::f();
namespaceName::ClassName::f();
}
else
{
// A namespace scope function.
f();
namespaceName::f();
}
}
--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?
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Victor Bazarov
Guest
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| Posted: Tue Aug 01, 2006 12:30 am Post subject: Re: how to invoke a method in C++? |
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Bob wrote:
| Quote: | My first language is Java and am now transferring to C++. I have two
questions.
(1) In Java, we have a very good API documentation. However, I could
not find an equivalent for C++. I tried to use the MSDN documentation
accompanying Visual Studio 2005. But I found it is not so good as the
JDK documentation provided by Sun.
|
Shouldn't you complain to MS about that?
| Quote: | For example, it is not easy to
distinguish from the documentation if a method in C++ is a static
method (invoked without an object), or the method is a instance method
(must be invoked by an object).
|
Not many standard class members are static.
I can recommend http://www.dinkumware.com/manuals/ as a potential
replacement for MSDN Library.
| Quote: | (2) The second question is actually the same as the first one. I don't
know in C++ when to invoke a method by an object (object.method()),
and when to invoke a method without an object (method()). Do you know
how to distinguish them? From the API provided by MSDN or elsewhere?
|
From docs, from compiler manuals, from books, from the Standard, from
online sources...
V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask
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Francis Glassborow
Guest
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| Posted: Wed Aug 02, 2006 12:59 am Post subject: Re: how to invoke a method in C++? |
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In article <NmIzg.29192$so3.22929 (AT) southeast (DOT) rr.com>, Jeffrey Schwab
<jeff (AT) schwabcenter (DOT) com> writes
| Quote: | Really? I always use it to distinguish functions that are members of
classes from functions that are not.
|
You may but it is not idiomatic language in the broader C++ community
where we normally talk of member-functions and (free) function.
--
Francis Glassborow ACCU
Author of 'You Can Do It!' and "You Can Program in C++"
see http://www.spellen.org/youcandoit
For project ideas and contributions:
http://www.spellen.org/youcandoit/projects
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