libstdc++-v3/testsuite/20_util/is_empty/value.cc

   1 // { dg-options "-std=gnu++11" }
   2 // { dg-do compile }
   3
   4 // Copyright (C) 2013 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11 //
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <type_traits>
  22 #include <testsuite_tr1.h>
  23
  24 class EmptyClassOne
  25 { typedef int type; };
  26
  27 class EmptyClassTwo
  28 { static int data; };
  29
  30 class EmptyClassThree
  31 { int f(); };
  32
  33 class NonEmptyClassOne
  34 { int data; };
  35
  36 class NonEmptyClassTwo
  37 {
  38   virtual int f();
  39   virtual ~NonEmptyClassTwo();
  40 };
  41
  42 void test01()
  43 {
  44   using std::is_empty;
  45   using namespace __gnu_test;
  46
  47   // Positive tests.
  48   static_assert(test_category<is_empty, ClassType>(true), "");
  49   static_assert(test_category<is_empty, EmptyClassOne>(true), "");
  50   static_assert(test_category<is_empty, EmptyClassTwo>(true), "");
  51   static_assert(test_category<is_empty, EmptyClassThree>(true), "");
  52
  53   // Negative tests.
  54   static_assert(test_category<is_empty, void>(false), "");
  55   static_assert(test_category<is_empty, float>(false), "");
  56   static_assert(test_category<is_empty, int[4]>(false), "");
  57   static_assert(test_category<is_empty, int*>(false), "");
  58   static_assert(test_category<is_empty, int&>(false), "");
  59   static_assert(test_category<is_empty, int (ClassType::*)>(false), "");
  60   static_assert(test_category<is_empty, EnumType>(false), "");
  61   static_assert(test_category<is_empty, int (int)>(false), "");
  62
  63   static_assert(test_category<is_empty, AbstractClass>(false), "");
  64   static_assert(test_category<is_empty, NonEmptyClassOne>(false), "");
  65   static_assert(test_category<is_empty, NonEmptyClassTwo>(false), "");
  66 }