Sorry, I probably wasn't clear. By "documentation" I meant html pages describing it that can go in the Boost distribution, and by "tests" I meant a unit test program which we can integrate into the Boost testing process to verify that enable_if works. The tests should not involve "the application in question" ;-) "Anders Moe" writes:

Hi again, and thanks for the reply.

I'd be happy to test it. The application in question is Geocap, a 3D vizualization app for the geosciences, some examples of which can be found here :

http://www.geocap.no/pages/geocap_ex_maps.html

Were mainly using

shared_ptr & co mpl static_assert & co type_traits

on Gnu 3.x, MSVC 2003.

I'll do a boost-sandbox and look for it there.

Regards,

Anders Moe, Geocap.

----- Original Message ----- From: "David Abrahams" Newsgroups: gmane.comp.lib.boost.user Sent: Tuesday, June 17, 2003 4:55 PM Subject: Re: enable_if part of boost ?

...

"Anders Moe" writes:

...

Hi all. After reading about enable_if in CUJ I decided to see if this was present in boost, which it is, sort of, in function_base.hpp. However, it seems to exist in function::, and my impression is that its not really an official boost component. Is this correct ?

Yeah, I guess it's not in the public interface. We have a version in the new Sandbox iterators (adaptors) library, so it will be getting to be more entrenched. Really all that's required to make it official is documentation and tests. Would you like to volunteer?

-- Dave Abrahams Boost Consulting www.boost-consulting.com

In article <16114.7174.507226.139791@damogran.osl.iu.edu>, Jaakko Jarvi wrote: | Jeremiah Willcock and I are volunteering (if someone else wants to do | it, scream stop now). Enable_if is most likely going to sit in the utility | library. Can we call it "restrict_to" ? :-) -- Howard Hinnant Metrowerks

Hy all, I want to use bjam as build tool for my application. Therefore I have some specific questions about jam and bjam: 1) Suppose I want to compile all .cpp files in a particular directory, how do I tell bjam to do it ? Here are three question closely related: 2) Is there a way to modify the output tree hierarchy created by bjam ? 3) Is there a way to modify the output filename format. For example, bjam adds a "lib" to the lib projects. Is this customizable ? 4) Is it possible to tell bjam to compile projects and "centralize" binaries and lib in one single directory ? That's it for today. Any help appriciated. Jonathan. ----------------------------------------------------------------------------------- Jonathan de Halleux, Research Assistant Center for Systems Engineering and Applied Mechanics (CESAME) Universite catholique de Louvain Batiment Euler , Av. Georges Lemaitre, 4 Tel : +32-10-47 2595 B-1348 Louvain-la-Neuve Belgium E-mail : dehalleux@auto.ucl.ac.be -----------------------------------------------------------------------------------

Hi Jonathan, It's probably better to post your Boost.Build questions on the jamboost list (cc:'d here). Jonathan de Halleux writes:

Hy all,

I want to use bjam as build tool for my application. Therefore I have some specific questions about jam and bjam:

1) Suppose I want to compile all .cpp files in a particular directory, how do I tell bjam to do it ?

There's a built-in rule called GLOB which can, well, glob. Putting [ GLOB $(directory) : *.cpp ] in your list of sources should work.

Here are three question closely related: 2) Is there a way to modify the output tree hierarchy created by bjam ?

You can set ALL_LOCATE_TARGET to change the root. Otherwise, no.

3) Is there a way to modify the output filename format. For example, bjam adds a "lib" to the lib projects. Is this customizable ?

Rene? I think you're the one to address this...

4) Is it possible to tell bjam to compile projects and "centralize" binaries and lib in one single directory ?

You can use the 'stage' rule. See http://www.boost.org/tools/build/build_system.htm#stage_targets. -- Dave Abrahams Boost Consulting www.boost-consulting.com

In article <16114.31427.407042.52724@damogran.osl.iu.edu>, Jaakko Jarvi wrote: | We'll write the library using the name enable_if, and if the Boost | community wants restrict_to or something else, we'll do a search | replace through all the 10 lines of code :) But restrict_to only takes five lines! :-) Ok, enough kidding around. enable_if has my vote (of course). Might be nice if the docs demonstrate its use with member template constructors (as opposed to just namespace scope functions). -- Howard Hinnant Metrowerks

From: "Howard Hinnant"

Might be nice if the docs demonstrate its use with member template constructors (as opposed to just namespace scope functions).

And conversion functions, perhaps: template<class T> class test { public: operator typename enable_if< boost::is_arithmetic<T>::value, T

::type() { return T(); } };

Assuming this is valid C++. :) Regards, Terje

In article <3fc901c337d4$5821a420$8d6c6f50@pc>, Terje Slettebø wrote: | Granted, this doesn't appear use SFINAE, though, so maybe leave it out. Your conversion operator example worked fine for me. test<int> converted to double, but not to std::string. | On | the other hand, does constructors? I get the same kind of error message for | both constructors and conversion operators, on both Intel C++ and g++: | | template<class T> | class test | { | public: | test(const T &, | typename enable_if< | is_arithmetic<T>::value, | T | >::type * = 0) {} | }; | | test a(1); // Ok | | test b(0 (int *) 0); // error: class "enable_if" has no member | "type" Maybe you meant: class test { public: template<class T> test(const T &, typename enable_if::type* = 0) {} }; int main () { test a(1); test b((int*)0); } And yes, test b is an error. If you want to make test b not an error, then you must add a ctor to accept it: test(int*) {} -- Howard Hinnant Metrowerks