RE: [boost] Re: Re: [math constants] C++ Language gurus views neededandCodewarrior & Comeau testers

From: Paul A Bristow (boost_at_[hidden])
Date: 2004-03-07 17:53:43

Many thanks - that is most helpful and may eventually solve the problem.

Paul

| -----Original Message-----
| From: boost-bounces_at_[hidden] 
| [mailto:boost-bounces_at_[hidden]] On Behalf Of Bronek Kozicki
| Sent: 07 March 2004 19:45
| To: boost_at_[hidden]
| Subject: [boost] Re: Re: [math constants] C++ Language gurus 
| views neededandCodewarrior & Comeau testers
| 
| 
| On Sun, 7 Mar 2004 17:54:37 -0000, Paul A Bristow wrote:
| > Daniel Frey's constant library milestone 2
| > 
| > /MathConstants/constant_library_m2_v1.tgz  21 Aug 2003
| 
| Ok, thanks. I have it. After some fixing (change file 
| extension from .cc
| to .cpp, change line endings from LF to CRLF, append one more 
| directory
| to INCLUDE) I received following error:
| 
| example.cpp(18) : error C3200: 'boost::math::pi_value<T>' : invalid
| template argument for template parameter 'F', expected a 
| class template
|         example.cpp(18) : see reference to class template 
| instantiation
| 'boost::math::pi_value<T>' being compiled
| example.cpp(81) : fatal error C1903: unable to recover from previous
| error(s); stopping compilation
| 
| I have stripped down problematic code to very simple:
| 
| #include <iostream>
| 
| template <template <typename> class F, typename T> struct 
| constant_value
| {
|     T operator()() const
|     {
|         return T();
|     }
| };
| 
| template <typename T> struct pi_value : constant_value 
| <pi_value, T> {};
| 
| int main()
| {
|   pi_value<double> t;
|   std::cout << t();
| }
| 
| and tried it under Comeau (online), with no problems. It also compiles
| fine under GCC 3.3.1 (mingw). From my (limited) understanding of
| templates this code is fine, thus apparently there's problem 
| with VC71.
| Looks like using template being just defined as template template
| parameter makes VC71 confused. I reported it to Microsoft (on its
| private newsgroup). 
| 
| 
| B.
| 
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