llvm/llvm/unittests/Support/TrailingObjectsTest.cpp

//=== - llvm/unittest/Support/TrailingObjectsTest.cpp ---------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "llvm/Support/TrailingObjects.h"
#include "gtest/gtest.h"

usingnamespacellvm;

namespace {
// This class, beyond being used by the test case, a nice
// demonstration of the intended usage of TrailingObjects, with a
// single trailing array.
class Class1 final : protected TrailingObjects<Class1, short> { … };

// Here, there are two singular optional object types appended.  Note
// that the alignment of Class2 is automatically increased to account
// for the alignment requirements of the trailing objects.
class Class2 final : protected TrailingObjects<Class2, double, short> { … };

TEST(TrailingObjects, OneArg) { … }

TEST(TrailingObjects, TwoArg) { … }

// This test class is not trying to be a usage demo, just asserting
// that three args does actually work too (it's the same code as
// handles the second arg, so it's basically covered by the above, but
// just in case..)
class Class3 final : public TrailingObjects<Class3, double, short, bool> { … };

TEST(TrailingObjects, ThreeArg) { … }

class Class4 final : public TrailingObjects<Class4, char, long> { … };

TEST(TrailingObjects, Realignment) { … }
}

// Test the use of TrailingObjects with a template class. This
// previously failed to compile due to a bug in MSVC's member access
// control/lookup handling for OverloadToken.
template <typename Derived>
class Class5Tmpl : private llvm::TrailingObjects<Derived, float, int> { … };

class Class5 : public Class5Tmpl<Class5> { … };