Re: [Boost-users] MPL & Shared Libraries

From: David Abrahams (dave_at_[hidden])
Date: 2007-11-28 15:56:49

on Tue Nov 27 2007, "Robert Dailey" <rcdailey-AT-gmail.com> wrote:

> Hi,
>
> I heard from someone that when building a shared library (DLL file), the compiler will not do
> the same processing of MPL code that it would do for an EXE. For example:
>
> struct Foo
> {
>     static const float val = 1.5f;
> };
>
> When exporting the 'Foo' class to a shared library, what will become
> of the 'val' member? 

I'm pretty certain that code is illegal. AFAIK only integral constants
can be initialized inside the class body.

> Is just the number "1.5f" written out or what? I've given a very
> simple example, but the more complex example expands into the
> boost::mpl library, which follows the same concepts.

This example really has nothing to do with MPL, since initialization
of floats is not a compile-time operation in C++.  Maybe you could be
more specific about what you're trying to do?

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com