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dnl @synopsis AC_CXX_EXPLICIT
dnl
dnl If the compiler can be asked to prevent using implicitly one
dnl argument constructors as converting constructors with the explicit
dnl keyword, define HAVE_EXPLICIT.
dnl
dnl @category Cxx
dnl @author Todd Veldhuizen
dnl @author Luc Maisonobe <luc@spaceroots.org>
dnl @version 2004-02-04
dnl @license AllPermissive
AC_DEFUN([AC_CXX_EXPLICIT],
[AC_CACHE_CHECK(whether the compiler supports the explicit keyword,
ac_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;],
ac_cv_cxx_explicit=yes, ac_cv_cxx_explicit=no)
AC_LANG_RESTORE
])
if test "$ac_cv_cxx_explicit" = yes; then
AC_DEFINE(HAVE_EXPLICIT,,[define if the compiler supports the explicit keyword])
fi
])
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