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ax_cxx_enum_computations_with_cast.m4
# ======================================================================================= # https://www.gnu.org/software/autoconf-archive/ax_cxx_enum_computations_with_cast.html # ======================================================================================= # # SYNOPSIS # # AX_CXX_ENUM_COMPUTATIONS_WITH_CAST # # DESCRIPTION # # If the compiler handle (int) casts in enum computations, define # HAVE_ENUM_COMPUTATIONS_WITH_CAST. # # 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. This file is offered as-is, without any # warranty. #serial 7 AU_ALIAS([AC_CXX_ENUM_COMPUTATIONS_WITH_CAST], [AX_CXX_ENUM_COMPUTATIONS_WITH_CAST]) AC_DEFUN([AX_CXX_ENUM_COMPUTATIONS_WITH_CAST], [AC_CACHE_CHECK(whether the compiler handles (int) casts in enum computations, ax_cv_cxx_enum_computations_with_cast, [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 = ((int)T1::a > (int)T2::a) ? (int)T1::a : (int)T2::b, b = (int)T1::b + (int)T2::b, c = ((int)T1::c * (int)T2::c + (int)T2::a + (int)T1::a) }; };],[ return (((int)Z<A,B>::a == 5) && ((int)Z<A,B>::b == 13) && ((int)Z<A,B>::c == 24)) ? 0 : 1;], ax_cv_cxx_enum_computations_with_cast=yes, ax_cv_cxx_enum_computations_with_cast=no) AC_LANG_RESTORE ]) if test "$ax_cv_cxx_enum_computations_with_cast" = yes; then AC_DEFINE(HAVE_ENUM_COMPUTATIONS_WITH_CAST,, [define if the compiler handles (int) casts in enum computations]) fi ])