Re: [Dev-C++] Export keyword problem

[Jason H. <jas...@nt...>]

Here's a qoute from a reference I have:

"The export keyword can precede a template declaration. It allows other files to use a template
declared in a different file by specifying only its declaration rather than duplicating its entire
definition."

If I remember correctly this feature is very new and not implemented in many compilers yet. It's to
do with the fact that old style binaries/libraries didn't have the ability to represent a templated
function within themselves, they could only represent a template function that had been targetted to
a specific type at compile time, i.e. int, float, MyClass, etc...

Also of interest:

"extern is a data type modifier that tells the compiler about a variable that is defined elsewhere
in a program. This is often used in conjunction with separately compiled files that share the same
global data. In essence, it notifies the compiler about the type of a variable without redefining
it......."

"For C++ only, extern is also used to create a linkage specification......"

Hope this helps,

Jason.

----- Original Message -----
From: "Mac Reiter" <re...@no...>
To: <dev...@li...>
Sent: Thursday, June 13, 2002 10:38 PM
Subject: Re: [Dev-C++] Export keyword problem


>The book C++ Primer, 3rd edition, Lippmann and Lajoie, speaks on two
>models of compilation: separation and inclusion. The separation model
>defines a function in a separate file and it becomes available with the
>keyword export. I tested this in the Dev and it did not work. The

I do not have this book available, but in a fair number of years of C and
C++ programming, I have never heard of the "export" keyword, except for DLL
creation in Microsoft compilers.  The closest I can think of is the
"extern" keyword, but it is used to import things from other compilation
units, and it is _not_ needed to get access to functions.

Could you give one or more quotes from your book, preferably with small
code examples if possible?

Mac
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