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# =======================================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cxx_default_template_parameters.html
# =======================================================================================
#
# SYNOPSIS
#
# AX_CXX_DEFAULT_TEMPLATE_PARAMETERS
#
# DESCRIPTION
#
# If the compiler supports default template parameters, define
# HAVE_DEFAULT_TEMPLATE_PARAMETERS.
#
# 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_DEFAULT_TEMPLATE_PARAMETERS], [AX_CXX_DEFAULT_TEMPLATE_PARAMETERS])
AC_DEFUN([AX_CXX_DEFAULT_TEMPLATE_PARAMETERS],
[dnl
AC_REQUIRE([AX_CXX_TEMPLATES])
AC_CACHE_CHECK([whether the compiler supports default template parameters],
[ax_cv_cxx_default_template_parameters],
[dnl
AS_IF([test "X$ax_cv_cxx_templates" = "Xyes"],
[dnl
AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([dnl
AC_LANG_PROGRAM([
template<class T = double, int N = 10> class A {
public: int f() {return 0;}
};
],
[A<float> a; return a.f();])],
ax_cv_cxx_default_template_parameters=yes,
ax_cv_cxx_default_template_parameters=no)
AC_LANG_POP([C++])
],
[ax_cv_cxx_default_template_parameters=no])
])
AS_IF([test "X$ax_cv_cxx_default_template_parameters" = "Xyes"],
[AC_DEFINE(HAVE_DEFAULT_TEMPLATE_PARAMETERS,,
[define if the compiler supports default template parameters])])
])
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