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# ==========================================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cxx_member_templates_outside_class.html
# ==========================================================================================
#
# SYNOPSIS
#
# AX_CXX_MEMBER_TEMPLATES_OUTSIDE_CLASS
#
# DESCRIPTION
#
# If the compiler supports member templates outside the class declaration,
# define HAVE_MEMBER_TEMPLATES_OUTSIDE_CLASS.
#
# LICENSE
#
# Copyright (c) 2008 Todd Veldhuizen
# Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 8
AU_ALIAS([AC_CXX_MEMBER_TEMPLATES_OUTSIDE_CLASS], [AX_CXX_MEMBER_TEMPLATES_OUTSIDE_CLASS])
AC_DEFUN([AX_CXX_MEMBER_TEMPLATES_OUTSIDE_CLASS],
[AC_CACHE_CHECK(whether the compiler supports member templates outside the class declaration,
ax_cv_cxx_member_templates_outside_class,
[AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
template<class T, int N> class A
{ public :
template<int N2> A<T,N> operator=(const A<T,N2>& z);
};
template<class T, int N> template<int N2>
A<T,N> A<T,N>::operator=(const A<T,N2>& z){ return A<T,N>(); }]], [[
A<double,4> x; A<double,7> y; x = y; return 0;]])],
[ax_cv_cxx_member_templates_outside_class=yes], [ax_cv_cxx_member_templates_outside_class=no])
AC_LANG_POP([C++])
])
if test "$ax_cv_cxx_member_templates_outside_class" = yes; then
AC_DEFINE(HAVE_MEMBER_TEMPLATES_OUTSIDE_CLASS,,
[define if the compiler supports member templates outside the class declaration])
fi
])
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