cxx_have_explicit_template_instantiation.m4

FreeFEM is an implementation of the GFEM language dedicated to the finite element method. It provid

dnl ----------------------------------------------------------------------
dnl
dnl CXX_HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
dnl ---------------------------------------------
dnl
dnl If the C++ compiler support explicit template instantiation, 
dnl                         define `HAVE_EXPLICIT_TEMPLATE_INSTANTIATION'.
dnl
dnl This program is free software; you can redistribute it and/or modify
dnl  it under the terms of the GNU General Public License as published by
dnl  the Free Software Foundation; either version 2 of the License, or
dnl  (at your option) any later version.
dnl  
dnl  This program is distributed in the hope that it will be useful,
dnl  but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dnl  GNU General Public License for more details.
dnl
dnl  You should have received a copy of the GNU General Public License
dnl  along with this program; if not, write to the Free Software
dnl  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

AC_DEFUN(CXX_HAVE_EXPLICIT_TEMPLATE_INSTANTIATION,
[
AC_REQUIRE([AC_PROG_CXX])
AC_MSG_CHECKING(whether the C++ compiler (${CXX}) supports explicit template instantiation)
AC_CACHE_VAL(ddec_cv_have_explicit_template_instantiation,
[
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE([template<class T> class Vector {
public:
    Vector() { }
};

template Vector<int>;
],[return 0;],
ddec_cv_have_explicit_template_instantiation=yes,
ddec_cv_have_explicit_template_instantiation=no)
AC_LANG_RESTORE
])
AC_MSG_RESULT($ddec_cv_have_explicit_template_instantiation)
if test "$ddec_cv_have_explicit_template_instantiation" = yes; then
AC_DEFINE(HAVE_EXPLICIT_TEMPLATE_INSTANTIATION)
fi
])dnl