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# ===========================================================================
# http://autoconf-archive.cryp.to/ac_cxx_enum_computations.html
# ===========================================================================
#
# SYNOPSIS
#
# AC_CXX_ENUM_COMPUTATIONS
#
# DESCRIPTION
#
# If the compiler handle computations inside an enum, define
# HAVE_ENUM_COMPUTATIONS.
#
# LICENSE
#
# Copyright (c) 2008 Todd Veldhuizen
# Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org>
#
# 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.
AC_DEFUN([AC_CXX_ENUM_COMPUTATIONS],
[AC_CACHE_CHECK(whether the compiler handle computations inside an enum,
ac_cv_cxx_enum_computations,
[AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE([
struct A { enum { a = 5, b = 7, c = 2 }; };
struct B { enum { a = 1, b = 6, c = 9 }; };
template<class T1, class T2> struct Z
{ enum { a = (T1::a > T2::a) ? T1::a : T2::b,
b = T1::b + T2::b,
c = (T1::c * T2::c + T2::a + T1::a)
};
};],[
return (((int)Z<A,B>::a == 5)
&& ((int)Z<A,B>::b == 13)
&& ((int)Z<A,B>::c == 24)) ? 0 : 1;],
ac_cv_cxx_enum_computations=yes, ac_cv_cxx_enum_computations=no)
AC_LANG_RESTORE
])
if test "$ac_cv_cxx_enum_computations" = yes; then
AC_DEFINE(HAVE_ENUM_COMPUTATIONS,,
[define if the compiler handle computations inside an enum])
fi
])
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