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From: Georg Bauhaus <sb463ba@l1-hrz.uni-duisburg.de>
Newsgroups: comp.lang.ada
Subject: Re: Announce: Grace project site operational
Date: Wed, 22 May 2002 11:40:35 +0000 (UTC)
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Dmitry A. Kazakov <mailbox@dmitry-kazakov.de> wrote:

:  C++ templates are simply untyped, substitute'n'pray.

Is this a general statement? Out of couriosity:

template <
  class Thing,
  int a,
  int plop(Thing a)
>
int oodle(Thing b) {
  return plop(b + a);
}

class does_not_have_plus
{
public:
  int count() { return 42; }

};

int clrkpt(does_not_have_plus p) {  return p.count(); }


int main(int c)
{
  does_not_have_plus me;
  return oodle<does_not_have_plus, 9, clrkpt>(me);
}

g++ -c test.cc
test.cc: In function
	`int oodle<does_not_have_plus, 9, clrkpt>(does_not_have_plus)':
test.cc:24:   instantiated from here
test.cc:7: no match for `does_not_have_plus & + int'

So (lack of C++ template understanding on my side not withstanding)
there are cases where a prayer isn't needed?

-- Georg