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# ============================================================================
# http://www.gnu.org/software/autoconf-archive/ax_cxx_rvalue_references.html
# ============================================================================
#
# SYNOPSIS
#
# AX_CXX_RVALUE_REFERENCES
#
# DESCRIPTION
#
# Check whether C++11 rvalue references are supported. If they are, the
# macro HAVE_RVALUE_REFERENCES is defined.
#
# Does not ensure that the compiler is in C++11 mode.
#
# LICENSE
#
# Copyright (c) 2012 Tudor Bosman <tudorb@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 1
AC_DEFUN([AX_CXX_RVALUE_REFERENCES], [dnl
AC_LANG_ASSERT([C++])
# This compilation should succeed...
AC_CACHE_CHECK(whether $CXX supports rvalue references,
ax_cv_cxx_rvalue_references_supported, [
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
#include <utility>
struct foo {
foo(foo&& other) { }
foo& operator=(foo&& other) {
if (&other == this) return *this;
std::move(other); // make sure this compiles
return *this;
}
};
]])],
[ax_cv_cxx_rvalue_references_supported=yes],
[ax_cv_cxx_rvalue_references_supported=no])])
if test $ax_cv_cxx_rvalue_references_supported = yes
then
AC_DEFINE([HAVE_RVALUE_REFERENCES], [],
[define if the compiler supports rvalue references])
fi
])
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