ac_cxx_templates_as_template_arguments

If the compiler supports templates as template arguments, define HAVE_TEMPLATES_AS_TEMPLATE_ARGUMENTS.

AC_DEFUN([AC_CXX_TEMPLATES_AS_TEMPLATE_ARGUMENTS],
[AC_CACHE_CHECK(whether the compiler supports templates as template arguments,
ac_cv_cxx_templates_as_template_arguments,
[AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE([
template<class T> class allocator { public : allocator() {}; };
template<class X, template<class Y> class T_alloc>
class A { public : A() {} private : T_alloc<X> alloc_; };
],[A<double, allocator> x; return 0;],
 ac_cv_cxx_templates_as_template_arguments=yes, ac_cv_cxx_templates_as_template_arguments=no)
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_templates_as_template_arguments" = yes; then
  AC_DEFINE(HAVE_TEMPLATES_AS_TEMPLATE_ARGUMENTS,,
            [define if the compiler supports templates as template arguments])
fi
])

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