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# =============================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cxx_have_placeholders.html
# =============================================================================
#
# SYNOPSIS
#
# AX_CXX_HAVE_PLACEHOLDERS()
#
# DESCRIPTION
#
# This macro checks if std::placeholders, added in C++11, is defined in
# the <functional> header.
#
# If it is, define the ax_cv_cxx_have_placeholders environment variable to
# "yes" and define HAVE_CXX_PLACEHOLDERS.
#
# LICENSE
#
# Copyright (c) 2014 Enrico M. Crisostomo <enrico.m.crisostomo@gmail.com>
#
# 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 2
AC_DEFUN([AX_CXX_HAVE_PLACEHOLDERS],
[AC_CACHE_CHECK(
[for std::placeholders in functional],
ax_cv_cxx_have_placeholders,
[dnl
AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[
[#include <functional>]
[using namespace std;]
[using namespace std::placeholders;]
[int fn(int x, int y) { return x + y; }]
],
[
[auto bound_function = bind (fn, 10, _1);]
[bound_function(20);]
]
)],
[ax_cv_cxx_have_placeholders=yes],
[ax_cv_cxx_have_placeholders=no]
)
AC_LANG_POP([C++])])
if test x"$ax_cv_cxx_have_placeholders" = "xyes"
then
AC_DEFINE(HAVE_CXX_PLACEHOLDERS,
1,
[Define if functional defines the std::placeholders namespace.])
fi
])
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