/usr/share/dune/aclocal/cxx11_std_declval.m4 is in libdune-common-dev 2.4.1-1.
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 33 34 35 36 | # tests for C++11 noexcept specifier support
# this test does not test the noexcept operator
# the associated macro is called HAVE_NOEXCEPT_SPECIFIER
AC_DEFUN([DUNE_CXX11_STD_DECLVAL_CHECK],[
AC_CACHE_CHECK([for C++11 std::declval()],
dune_cv_cxx11_std_declval,
[
AC_REQUIRE([AC_PROG_CXX])
AC_REQUIRE([CXX11])
AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM(
[
#include <utility>
template<typename T>
struct check;
template<>
struct check<int&&>
{
int pass() { return 0; }
};
],[
return check<decltype(std::declval<int>())>().pass();
])],
dune_cv_cxx11_std_declval=yes,
dune_cv_cxx11_std_declval=no)
AC_LANG_POP
])
if test "$dune_cv_cxx11_std_declval" = yes; then
AC_DEFINE(HAVE_STD_DECLVAL, 1,
[Define to 1 if C++11 std::declval() is supported])
fi
])
|