ac_cxx_partial_specialization.m4

来自「A C++ class library for scientific compu」· M4 代码 · 共 22 行

dnl Available from the GNU Autoconf Macro Archive at:
dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_partial_specialization.html
dnl
AC_DEFUN([AC_CXX_PARTIAL_SPECIALIZATION],
[AC_CACHE_CHECK(whether the compiler supports partial specialization,
ac_cv_cxx_partial_specialization,
[AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE([
template<class T, int N> class A            { public : enum e { z = 0 }; };
template<int N>          class A<double, N> { public : enum e { z = 1 }; };
template<class T>        class A<T, 2>      { public : enum e { z = 2 }; };
],[return (A<int,3>::z == 0) && (A<double,3>::z == 1) && (A<float,2>::z == 2);],
 ac_cv_cxx_partial_specialization=yes, ac_cv_cxx_partial_specialization=no)
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_partial_specialization" = yes; then
  AC_DEFINE(HAVE_PARTIAL_SPECIALIZATION,,
            [define if the compiler supports partial specialization])
fi
])