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# ====================================================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cxx_explicit_template_function_qualification.html
# ====================================================================================================
#
# SYNOPSIS
#
# AX_CXX_EXPLICIT_TEMPLATE_FUNCTION_QUALIFICATION
#
# DESCRIPTION
#
# If the compiler supports explicit template function qualification,
# define HAVE_EXPLICIT_TEMPLATE_FUNCTION_QUALIFICATION.
#
# 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_EXPLICIT_TEMPLATE_FUNCTION_QUALIFICATION], [AX_CXX_EXPLICIT_TEMPLATE_FUNCTION_QUALIFICATION])
AC_DEFUN([AX_CXX_EXPLICIT_TEMPLATE_FUNCTION_QUALIFICATION],
[AC_CACHE_CHECK(whether the compiler supports explicit template function qualification,
ax_cv_cxx_explicit_template_function_qualification,
[AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
template<class Z> class A { public : A() {} };
template<class X, class Y> A<X> to (const A<Y>&) { return A<X>(); }
]], [[A<float> x; A<double> y = to<double>(x); return 0;]])],
[ax_cv_cxx_explicit_template_function_qualification=yes], [ax_cv_cxx_explicit_template_function_qualification=no])
AC_LANG_POP([C++])
])
if test "$ax_cv_cxx_explicit_template_function_qualification" = yes; then
AC_DEFINE(HAVE_EXPLICIT_TEMPLATE_FUNCTION_QUALIFICATION,,
[define if the compiler supports explicit template function qualification])
fi
])
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