hotspot/test/native/metaprogramming/test_enableIf.cpp
author eosterlund
Tue, 11 Jul 2017 12:00:48 +0200
changeset 46649 439ffb1e05ec
permissions -rw-r--r--
8183927: Hotspot needs C++ type_traits metaprogramming utilities Summary: This changeset introduces new metaprogramming utilities typically found in <type_traits> in C++11. Reviewed-by: kbarrett, rehn, pliden Contributed-by: erik.osterlund@oracle.com, kim.barrett@oracle.com

/*
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#include "precompiled.hpp"
#include "memory/allocation.hpp"
#include "metaprogramming/enableIf.hpp"
#include "utilities/debug.hpp"

class EnableIfTest {
  class A: AllStatic {
  public:
    template <bool condition>
    static typename EnableIf<condition, char>::type test();
    template <bool condition>
    static typename EnableIf<!condition, long>::type test();
  };

  static const bool A_test_true_is_char = sizeof(A::test<true>()) == sizeof(char);
  STATIC_ASSERT(A_test_true_is_char);

  static const bool A_test_false_is_long = sizeof(A::test<false>()) == sizeof(long);
  STATIC_ASSERT(A_test_false_is_long);
};