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llvm-project/libcxx/test/std/concepts/concepts.lang/concept.commonref/common_reference.compile.pass.cpp
Louis Dionne 72f0edf3f4 [libc++] Remove unnecessary main() function in .compile.pass.cpp and .verify.cpp tests 
We pretty consistently don't define those cause they are not needed,
and it removes the potential pitfall to think that these tests are
being run. This doesn't touch .compile.fail.cpp tests since those
should be replaced by .verify.cpp tests anyway, and there would be
a lot to fix up.

As a fly-by, I also fixed a bit of formatting, removed a few unused
includes and made some very minor, clearly NFC refactorings such as
in allocator.traits/allocator.traits.members/allocate.verify.cpp where
the old test basically made no sense the way it was written.

Differential Revision: https://reviews.llvm.org/D146236
2023-03-17 17:56:21 -04:00

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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// template<class From, class To>
// concept common_reference_with;
#include <concepts>
#include <type_traits>
#include "test_macros.h"
template <class T, class U>
constexpr bool CheckCommonReferenceWith() noexcept {
static_assert(std::common_reference_with<T, U&>);
static_assert(std::common_reference_with<T, const U&>);
static_assert(std::common_reference_with<T, volatile U&>);
static_assert(std::common_reference_with<T, const volatile U&>);
static_assert(std::common_reference_with<T, U&&>);
static_assert(std::common_reference_with<T, const U&&>);
static_assert(std::common_reference_with<T, volatile U&&>);
static_assert(std::common_reference_with<T, const volatile U&&>);
static_assert(std::common_reference_with<T&, U&&>);
static_assert(std::common_reference_with<T&, const U&&>);
static_assert(std::common_reference_with<T&, volatile U&&>);
static_assert(std::common_reference_with<T&, const volatile U&&>);
static_assert(std::common_reference_with<const T&, U&&>);
static_assert(std::common_reference_with<const T&, const U&&>);
static_assert(std::common_reference_with<const T&, volatile U&&>);
static_assert(std::common_reference_with<const T&, const volatile U&&>);
static_assert(std::common_reference_with<volatile T&, U&&>);
static_assert(std::common_reference_with<volatile T&, const U&&>);
static_assert(std::common_reference_with<volatile T&, volatile U&&>);
static_assert(std::common_reference_with<volatile T&, const volatile U&&>);
static_assert(std::common_reference_with<const volatile T&, U&&>);
static_assert(std::common_reference_with<const volatile T&, const U&&>);
static_assert(std::common_reference_with<const volatile T&, volatile U&&>);
static_assert(
std::common_reference_with<const volatile T&, const volatile U&&>);
return std::common_reference_with<T, U>;
}
namespace BuiltinTypes {
// fundamental types
static_assert(std::common_reference_with<void, void>);
static_assert(CheckCommonReferenceWith<int, int>());
static_assert(CheckCommonReferenceWith<int, long>());
static_assert(CheckCommonReferenceWith<int, unsigned char>());
#ifndef TEST_HAS_NO_INT128
static_assert(CheckCommonReferenceWith<int, __int128_t>());
#endif
static_assert(CheckCommonReferenceWith<int, double>());
// arrays
static_assert(CheckCommonReferenceWith<int[5], int[5]>());
// pointers (common with void*)
static_assert(CheckCommonReferenceWith<int*, void*>());
static_assert(CheckCommonReferenceWith<int*, const void*>());
static_assert(CheckCommonReferenceWith<int*, volatile void*>());
static_assert(CheckCommonReferenceWith<int*, const volatile void*>());
static_assert(CheckCommonReferenceWith<const int*, void*>());
static_assert(CheckCommonReferenceWith<const int*, const void*>());
static_assert(CheckCommonReferenceWith<const int*, volatile void*>());
static_assert(CheckCommonReferenceWith<const int*, const volatile void*>());
static_assert(CheckCommonReferenceWith<volatile int*, void*>());
static_assert(CheckCommonReferenceWith<volatile int*, const void*>());
static_assert(CheckCommonReferenceWith<volatile int*, volatile void*>());
static_assert(CheckCommonReferenceWith<volatile int*, const volatile void*>());
static_assert(CheckCommonReferenceWith<const volatile int*, void*>());
static_assert(CheckCommonReferenceWith<const volatile int*, const void*>());
static_assert(CheckCommonReferenceWith<const volatile int*, volatile void*>());
static_assert(
CheckCommonReferenceWith<const volatile int*, const volatile void*>());
static_assert(CheckCommonReferenceWith<int (*)(), int (*)()>());
static_assert(CheckCommonReferenceWith<int (*)(), int (*)() noexcept>());
struct S {};
static_assert(CheckCommonReferenceWith<int S::*, int S::*>());
static_assert(CheckCommonReferenceWith<int S::*, const int S::*>());
static_assert(CheckCommonReferenceWith<int (S::*)(), int (S::*)()>());
static_assert(CheckCommonReferenceWith<int (S::*)(), int (S::*)() noexcept>());
static_assert(
CheckCommonReferenceWith<int (S::*)() const, int (S::*)() const>());
static_assert(CheckCommonReferenceWith<int (S::*)() const,
int (S::*)() const noexcept>());
static_assert(
CheckCommonReferenceWith<int (S::*)() volatile, int (S::*)() volatile>());
static_assert(CheckCommonReferenceWith<int (S::*)() volatile,
int (S::*)() volatile noexcept>());
static_assert(CheckCommonReferenceWith<int (S::*)() const volatile,
int (S::*)() const volatile>());
static_assert(CheckCommonReferenceWith<int (S::*)() const volatile,
int (S::*)() const volatile noexcept>());
// nonsense
static_assert(!std::common_reference_with<double, float*>);
static_assert(!std::common_reference_with<int, int[5]>);
static_assert(!std::common_reference_with<int*, long*>);
static_assert(!std::common_reference_with<int*, unsigned int*>);
static_assert(!std::common_reference_with<int (*)(), int (*)(int)>);
static_assert(!std::common_reference_with<int S::*, float S::*>);
static_assert(!std::common_reference_with<int (S::*)(), int (S::*)() const>);
static_assert(!std::common_reference_with<int (S::*)(), int (S::*)() volatile>);
static_assert(
!std::common_reference_with<int (S::*)(), int (S::*)() const volatile>);
static_assert(
!std::common_reference_with<int (S::*)() const, int (S::*)() volatile>);
static_assert(!std::common_reference_with<int (S::*)() const,
int (S::*)() const volatile>);
static_assert(!std::common_reference_with<int (S::*)() volatile,
int (S::*)() const volatile>);
} // namespace BuiltinTypes
namespace NoDefaultCommonReference {
class T {};
static_assert(!std::common_reference_with<T, int>);
static_assert(!std::common_reference_with<int, T>);
static_assert(!std::common_reference_with<T, int[10]>);
static_assert(!std::common_reference_with<T[10], int>);
static_assert(!std::common_reference_with<T*, int*>);
static_assert(!std::common_reference_with<T*, const int*>);
static_assert(!std::common_reference_with<T*, volatile int*>);
static_assert(!std::common_reference_with<T*, const volatile int*>);
static_assert(!std::common_reference_with<const T*, int*>);
static_assert(!std::common_reference_with<volatile T*, int*>);
static_assert(!std::common_reference_with<const volatile T*, int*>);
static_assert(!std::common_reference_with<const T*, const int*>);
static_assert(!std::common_reference_with<const T*, volatile int*>);
static_assert(!std::common_reference_with<const T*, const volatile int*>);
static_assert(!std::common_reference_with<const T*, const int*>);
static_assert(!std::common_reference_with<volatile T*, const int*>);
static_assert(!std::common_reference_with<const volatile T*, const int*>);
static_assert(!std::common_reference_with<volatile T*, const int*>);
static_assert(!std::common_reference_with<volatile T*, volatile int*>);
static_assert(!std::common_reference_with<volatile T*, const volatile int*>);
static_assert(!std::common_reference_with<const T*, volatile int*>);
static_assert(!std::common_reference_with<volatile T*, volatile int*>);
static_assert(!std::common_reference_with<const volatile T*, volatile int*>);
static_assert(!std::common_reference_with<const volatile T*, const int*>);
static_assert(!std::common_reference_with<const volatile T*, volatile int*>);
static_assert(
!std::common_reference_with<const volatile T*, const volatile int*>);
static_assert(!std::common_reference_with<const T*, const volatile int*>);
static_assert(!std::common_reference_with<volatile T*, const volatile int*>);
static_assert(
!std::common_reference_with<const volatile T*, const volatile int*>);
static_assert(!std::common_reference_with<T&, int&>);
static_assert(!std::common_reference_with<T&, const int&>);
static_assert(!std::common_reference_with<T&, volatile int&>);
static_assert(!std::common_reference_with<T&, const volatile int&>);
static_assert(!std::common_reference_with<const T&, int&>);
static_assert(!std::common_reference_with<volatile T&, int&>);
static_assert(!std::common_reference_with<const volatile T&, int&>);
static_assert(!std::common_reference_with<const T&, const int&>);
static_assert(!std::common_reference_with<const T&, volatile int&>);
static_assert(!std::common_reference_with<const T&, const volatile int&>);
static_assert(!std::common_reference_with<const T&, const int&>);
static_assert(!std::common_reference_with<volatile T&, const int&>);
static_assert(!std::common_reference_with<const volatile T&, const int&>);
static_assert(!std::common_reference_with<volatile T&, const int&>);
static_assert(!std::common_reference_with<volatile T&, volatile int&>);
static_assert(!std::common_reference_with<volatile T&, const volatile int&>);
static_assert(!std::common_reference_with<const T&, volatile int&>);
static_assert(!std::common_reference_with<volatile T&, volatile int&>);
static_assert(!std::common_reference_with<const volatile T&, volatile int&>);
static_assert(!std::common_reference_with<const volatile T&, const int&>);
static_assert(!std::common_reference_with<const volatile T&, volatile int&>);
static_assert(
!std::common_reference_with<const volatile T&, const volatile int&>);
static_assert(!std::common_reference_with<const T&, const volatile int&>);
static_assert(!std::common_reference_with<volatile T&, const volatile int&>);
static_assert(
!std::common_reference_with<const volatile T&, const volatile int&>);
static_assert(!std::common_reference_with<T&, int&&>);
static_assert(!std::common_reference_with<T&, const int&&>);
static_assert(!std::common_reference_with<T&, volatile int&&>);
static_assert(!std::common_reference_with<T&, const volatile int&&>);
static_assert(!std::common_reference_with<const T&, int&&>);
static_assert(!std::common_reference_with<volatile T&, int&&>);
static_assert(!std::common_reference_with<const volatile T&, int&&>);
static_assert(!std::common_reference_with<const T&, const int&&>);
static_assert(!std::common_reference_with<const T&, volatile int&&>);
static_assert(!std::common_reference_with<const T&, const volatile int&&>);
static_assert(!std::common_reference_with<const T&, const int&&>);
static_assert(!std::common_reference_with<volatile T&, const int&&>);
static_assert(!std::common_reference_with<const volatile T&, const int&&>);
static_assert(!std::common_reference_with<volatile T&, const int&&>);
static_assert(!std::common_reference_with<volatile T&, volatile int&&>);
static_assert(!std::common_reference_with<volatile T&, const volatile int&&>);
static_assert(!std::common_reference_with<const T&, volatile int&&>);
static_assert(!std::common_reference_with<volatile T&, volatile int&&>);
static_assert(!std::common_reference_with<const volatile T&, volatile int&&>);
static_assert(!std::common_reference_with<const volatile T&, const int&&>);
static_assert(!std::common_reference_with<const volatile T&, volatile int&&>);
static_assert(
!std::common_reference_with<const volatile T&, const volatile int&&>);
static_assert(!std::common_reference_with<const T&, const volatile int&&>);
static_assert(!std::common_reference_with<volatile T&, const volatile int&&>);
static_assert(
!std::common_reference_with<const volatile T&, const volatile int&&>);
static_assert(!std::common_reference_with<T&&, int&>);
static_assert(!std::common_reference_with<T&&, const int&>);
static_assert(!std::common_reference_with<T&&, volatile int&>);
static_assert(!std::common_reference_with<T&&, const volatile int&>);
static_assert(!std::common_reference_with<const T&&, int&>);
static_assert(!std::common_reference_with<volatile T&&, int&>);
static_assert(!std::common_reference_with<const volatile T&&, int&>);
static_assert(!std::common_reference_with<const T&&, const int&>);
static_assert(!std::common_reference_with<const T&&, volatile int&>);
static_assert(!std::common_reference_with<const T&&, const volatile int&>);
static_assert(!std::common_reference_with<const T&&, const int&>);
static_assert(!std::common_reference_with<volatile T&&, const int&>);
static_assert(!std::common_reference_with<const volatile T&&, const int&>);
static_assert(!std::common_reference_with<volatile T&&, const int&>);
static_assert(!std::common_reference_with<volatile T&&, volatile int&>);
static_assert(!std::common_reference_with<volatile T&&, const volatile int&>);
static_assert(!std::common_reference_with<const T&&, volatile int&>);
static_assert(!std::common_reference_with<volatile T&&, volatile int&>);
static_assert(!std::common_reference_with<const volatile T&&, volatile int&>);
static_assert(!std::common_reference_with<const volatile T&&, const int&>);
static_assert(!std::common_reference_with<const volatile T&&, volatile int&>);
static_assert(
!std::common_reference_with<const volatile T&&, const volatile int&>);
static_assert(!std::common_reference_with<const T&&, const volatile int&>);
static_assert(!std::common_reference_with<volatile T&&, const volatile int&>);
static_assert(
!std::common_reference_with<const volatile T&&, const volatile int&>);
static_assert(!std::common_reference_with<T&&, int&&>);
static_assert(!std::common_reference_with<T&&, const int&&>);
static_assert(!std::common_reference_with<T&&, volatile int&&>);
static_assert(!std::common_reference_with<T&&, const volatile int&&>);
static_assert(!std::common_reference_with<const T&&, int&&>);
static_assert(!std::common_reference_with<volatile T&&, int&&>);
static_assert(!std::common_reference_with<const volatile T&&, int&&>);
static_assert(!std::common_reference_with<const T&&, const int&&>);
static_assert(!std::common_reference_with<const T&&, volatile int&&>);
static_assert(!std::common_reference_with<const T&&, const volatile int&&>);
static_assert(!std::common_reference_with<const T&&, const int&&>);
static_assert(!std::common_reference_with<volatile T&&, const int&&>);
static_assert(!std::common_reference_with<const volatile T&&, const int&&>);
static_assert(!std::common_reference_with<volatile T&&, const int&&>);
static_assert(!std::common_reference_with<volatile T&&, volatile int&&>);
static_assert(!std::common_reference_with<volatile T&&, const volatile int&&>);
static_assert(!std::common_reference_with<const T&&, volatile int&&>);
static_assert(!std::common_reference_with<volatile T&&, volatile int&&>);
static_assert(!std::common_reference_with<const volatile T&&, volatile int&&>);
static_assert(!std::common_reference_with<const volatile T&&, const int&&>);
static_assert(!std::common_reference_with<const volatile T&&, volatile int&&>);
static_assert(
!std::common_reference_with<const volatile T&&, const volatile int&&>);
static_assert(!std::common_reference_with<const T&&, const volatile int&&>);
static_assert(!std::common_reference_with<volatile T&&, const volatile int&&>);
static_assert(
!std::common_reference_with<const volatile T&&, const volatile int&&>);
} // namespace NoDefaultCommonReference
struct BadBasicCommonReference {
// This test is ill-formed, NDR. If it ever blows up in our faces: that's a good thing.
// In the meantime, the test should be included. If compiler support is added, then an include guard
// should be placed so the test doesn't get deleted.
operator int() const;
operator int&();
};
static_assert(std::convertible_to<BadBasicCommonReference, int>);
static_assert(std::convertible_to<BadBasicCommonReference, int&>);
namespace std {
template <template <class> class X, template <class> class Y>
struct basic_common_reference<BadBasicCommonReference, int, X, Y> {
using type = BadBasicCommonReference&;
};
template <template <class> class X, template <class> class Y>
struct basic_common_reference<int, BadBasicCommonReference, X, Y> {
using type = int&;
};
} // namespace std
static_assert(!std::common_reference_with<BadBasicCommonReference, int>);
struct StructNotConvertibleToCommonReference {
explicit(false) StructNotConvertibleToCommonReference(int);
};
static_assert(std::convertible_to<int, StructNotConvertibleToCommonReference>);
namespace std {
template <template <class> class X, template <class> class Y>
struct basic_common_reference<StructNotConvertibleToCommonReference, int, X,
Y> {
using type = int&;
};
template <template <class> class X, template <class> class Y>
struct basic_common_reference<int, StructNotConvertibleToCommonReference, X,
Y> {
using type = int&;
};
} // namespace std
static_assert(
!std::common_reference_with<StructNotConvertibleToCommonReference, int>);
struct IntNotConvertibleToCommonReference {
operator int&() const;
};
namespace std {
template <template <class> class X, template <class> class Y>
struct basic_common_reference<IntNotConvertibleToCommonReference, int, X, Y> {
using type = int&;
};
template <template <class> class X, template <class> class Y>
struct basic_common_reference<int, IntNotConvertibleToCommonReference, X, Y> {
using type = int&;
};
} // namespace std
static_assert(
!std::common_reference_with<StructNotConvertibleToCommonReference, int>);
struct HasCommonReference {
explicit(false) HasCommonReference(int);
operator int&() const;
};
namespace std {
template <template <class> class X, template <class> class Y>
struct basic_common_reference<HasCommonReference, int, X, Y> {
using type = int&;
};
template <template <class> class X, template <class> class Y>
struct basic_common_reference<int, HasCommonReference, X, Y> {
using type = int&;
};
} // namespace std
static_assert(!std::common_reference_with<HasCommonReference, int>);
static_assert(std::common_reference_with<HasCommonReference, int&>);
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