Macro: ac_cxx_default_template_parameters

Back to the Main Page. | Download the M4 Source.

# ac_cxx_default_template_parameters

Synopsis

  `AC_CXX_DEFAULT_TEMPLATE_PARAMETERS`

Version

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

Author

  Luc Maisonobe

Description

  If the compiler supports default template parameters, define HAVE_DEFAULT_TEMPLATE_PARAMETERS.

M4 Source Code

      AC_DEFUN([AC_CXX_DEFAULT_TEMPLATE_PARAMETERS],
      [AC_CACHE_CHECK(whether the compiler supports default template parameters,
      ac_cv_cxx_default_template_parameters,
      [AC_LANG_SAVE
       AC_LANG_CPLUSPLUS
       AC_TRY_COMPILE([
      template<class T = double, int N = 10> class A {public: int f() {return 0;}};
      ],[A<float> a; return a.f();],
       ac_cv_cxx_default_template_parameters=yes, ac_cv_cxx_default_template_parameters=no)
       AC_LANG_RESTORE
      ])
      if test "$ac_cv_cxx_default_template_parameters" = yes; then
        AC_DEFINE(HAVE_DEFAULT_TEMPLATE_PARAMETERS,,
                  [define if the compiler supports default template parameters])
      fi
      ])