Macro: ac_cxx_explicit

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Synopsis

  `AC_CXX_EXPLICIT`

Version

  1.1.1.1 (2001/07/26) C++_Support @ ac-archive-0.5.39

Author

  Luc Maisonobe

Description

  If the compiler can be asked to prevent using implicitly one argument constructors as converting constructors with the explicit keyword, define HAVE_EXPLICIT.

M4 Source Code

      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
      ])