/usr/share/dune/aclocal/cxx0x_rvaluereference.m4 is in libdune-common-dev 2.2.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | # tests compiler support for C++0x rvalue references
# the associated macro is called HAVE_RVALUE_REFERENCES
AC_DEFUN([RVALUE_REFERENCES_CHECK],[
AC_CACHE_CHECK([whether rvalue references are supported], dune_cv_rvalue_references_support, [
AC_REQUIRE([AC_PROG_CXX])
AC_REQUIRE([GXX0X])
AC_LANG_PUSH([C++])
AC_RUN_IFELSE([
AC_LANG_PROGRAM([#include<cassert>
#include <utility>
int foo(int&& x) { return 1; }
int foo(const int& x) { return -1; }
template<typename T>
int forward(T&& x)
{
return foo(std::forward<T>(x));
}],
[
int i = 0;
assert( forward(i) + forward(int(2)) == 0);
return 0;
])],
dune_cv_rvalue_references_support=yes,
dune_cv_rvalue_references_support=no)
AC_LANG_POP
])
if test "x$dune_cv_rvalue_references_support" = xyes; then
AC_DEFINE(HAVE_RVALUE_REFERENCES, 1, [Define to 1 if rvalue references are supported])
fi
])
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