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- # ===========================================================================
- # https://www.gnu.org/software/autoconf-archive/ax_cxx_explicit.html
- # ===========================================================================
- #
- # SYNOPSIS
- #
- # AX_CXX_EXPLICIT
- #
- # DESCRIPTION
- #
- # If the compiler can be asked to prevent using implicitly one argument
- # constructors as converting constructors with the explicit keyword,
- # define HAVE_EXPLICIT.
- #
- # 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_EXPLICIT], [AX_CXX_EXPLICIT])
- AC_DEFUN([AX_CXX_EXPLICIT],
- [AC_CACHE_CHECK(whether the compiler supports the explicit keyword,
- ax_cv_cxx_explicit,
- [AC_LANG_SAVE
- AC_LANG_CPLUSPLUS
- AC_TRY_COMPILE([class A{public:explicit A(double){}};],
- [double c = 5.0;A x(c);return 0;],
- ax_cv_cxx_explicit=yes, ax_cv_cxx_explicit=no)
- AC_LANG_RESTORE
- ])
- if test "$ax_cv_cxx_explicit" = yes; then
- AC_DEFINE(HAVE_EXPLICIT,,[define if the compiler supports the explicit keyword])
- fi
- ])
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