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

   1 // { dg-do compile { target c++11 } }
   2
   3 // Copyright (C) 2013-2021 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10 //
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15 //
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <type_traits>
  21 #include <testsuite_tr1.h>
  22
  23 class EmptyClassOne
  24 { typedef int type; };
  25
  26 class EmptyClassTwo
  27 { static int data; };
  28
  29 class EmptyClassThree
  30 { int f(); };
  31
  32 class NonEmptyClassOne
  33 { int data; };
  34
  35 class NonEmptyClassTwo
  36 {
  37   virtual int f();
  38   virtual ~NonEmptyClassTwo();
  39 };
  40
  41 void test01()
  42 {
  43   using std::is_empty;
  44   using namespace __gnu_test;
  45
  46   // Positive tests.
  47   static_assert(test_category<is_empty, ClassType>(true), "");
  48   static_assert(test_category<is_empty, EmptyClassOne>(true), "");
  49   static_assert(test_category<is_empty, EmptyClassTwo>(true), "");
  50   static_assert(test_category<is_empty, EmptyClassThree>(true), "");
  51
  52   // Negative tests.
  53   static_assert(test_category<is_empty, void>(false), "");
  54   static_assert(test_category<is_empty, float>(false), "");
  55   static_assert(test_category<is_empty, int[4]>(false), "");
  56   static_assert(test_category<is_empty, int*>(false), "");
  57   static_assert(test_category<is_empty, int&>(false), "");
  58   static_assert(test_category<is_empty, int (ClassType::*)>(false), "");
  59   static_assert(test_category<is_empty, EnumType>(false), "");
  60   static_assert(test_category<is_empty, int (int)>(false), "");
  61
  62   static_assert(test_category<is_empty, AbstractClass>(false), "");
  63   static_assert(test_category<is_empty, NonEmptyClassOne>(false), "");
  64   static_assert(test_category<is_empty, NonEmptyClassTwo>(false), "");
  65 }