TypeEnumeratorTest.cpp

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/*  SPDX-License-Identifier: GPL-2.0-or-later */
/*!********************************************************************
 
  Audacity: A Digital Audio Editor
 
  TypeEnumerator.cpp
  @brief compilation-only tests as examples of use of TypeEnumerator
 
  Paul Licameli
 
**********************************************************************/
#include <catch2/catch.hpp>
#include "TypeEnumerator.h"
 
using namespace TypeEnumerator;
using namespace TypeList;
 
BEGIN_TYPE_ENUMERATION(Tag1)
BEGIN_TYPE_ENUMERATION(Tag2)
 
ENUMERATE_TYPE(Tag1, void)
ENUMERATE_TYPE(Tag2, char)
 
TEST_CASE("Using different tags")
{
   struct Here1 : Tag1{};
   struct Here2 : Tag2{};
   static_assert(std::is_same_v<List<void>,
      CollectTypes<Tag1, Here1>::type>);
   static_assert(std::is_same_v<List<char>,
      CollectTypes<Tag2, Here2>::type>);
}
 
ENUMERATE_TYPE(Tag1, const volatile int&)
ENUMERATE_TYPE(Tag2, long)
 
TEST_CASE("Dependency on location")
{
   struct Here1 : Tag1{};
   struct Here2 : Tag2{};
   static_assert(std::is_same_v<List<void, const volatile int&>,
      CollectTypes<Tag1, Here1>::type>);
   static_assert(std::is_same_v<List<char, long>,
      CollectTypes<Tag2, Here2>::type>);
}
 
ENUMERATE_TYPE(Tag1, const volatile int&)
ENUMERATE_TYPE(Tag2, long)
 
TEST_CASE("Distinct types, only")
{
   struct Here1 : Tag1{};
   struct Here2 : Tag2{};
   static_assert(std::is_same_v<List<void, const volatile int&>,
      CollectTypes<Tag1, Here1>::type>);
   static_assert(std::is_same_v<List<char, long>,
      CollectTypes<Tag2, Here2>::type>);
}