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- # =============================================================================
- # https://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 2
-
- 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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