3c0300d1fe
Per [range.view]/6, a `view_interface` isn't a base class of itself, so `enable_view` should report `false`. Also, current implementation strategy handles `const` but not `volatile`, IIUC cv-qualifiers should be consistent handled. In `enable_view.compile.pass.cpp`, coverage for (`const`) `volatile` types are added. Drive-by: Remove one unnessary `test_macro.h` inclusion in a test. Fixes #132577.
168 lines
8.6 KiB
C++
168 lines
8.6 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// <ranges>
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// template<class T>
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// inline constexpr bool enable_view = ...;
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#include <ranges>
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#include "test_macros.h"
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// Doesn't derive from view_base
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struct Empty { };
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static_assert(!std::ranges::enable_view<Empty>);
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static_assert(!std::ranges::enable_view<Empty&>);
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static_assert(!std::ranges::enable_view<Empty&&>);
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static_assert(!std::ranges::enable_view<const Empty>);
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static_assert(!std::ranges::enable_view<const Empty&>);
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static_assert(!std::ranges::enable_view<const Empty&&>);
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static_assert(!std::ranges::enable_view<volatile Empty>);
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static_assert(!std::ranges::enable_view<volatile Empty&>);
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static_assert(!std::ranges::enable_view<volatile Empty&&>);
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static_assert(!std::ranges::enable_view<const volatile Empty>);
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static_assert(!std::ranges::enable_view<const volatile Empty&>);
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static_assert(!std::ranges::enable_view<const volatile Empty&&>);
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// Derives from view_base, but privately
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struct PrivateViewBase : private std::ranges::view_base { };
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static_assert(!std::ranges::enable_view<PrivateViewBase>);
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static_assert(!std::ranges::enable_view<PrivateViewBase&>);
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static_assert(!std::ranges::enable_view<PrivateViewBase&&>);
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static_assert(!std::ranges::enable_view<const PrivateViewBase>);
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static_assert(!std::ranges::enable_view<const PrivateViewBase&>);
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static_assert(!std::ranges::enable_view<const PrivateViewBase&&>);
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static_assert(!std::ranges::enable_view<volatile PrivateViewBase>);
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static_assert(!std::ranges::enable_view<volatile PrivateViewBase&>);
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static_assert(!std::ranges::enable_view<volatile PrivateViewBase&&>);
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static_assert(!std::ranges::enable_view<const volatile PrivateViewBase>);
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static_assert(!std::ranges::enable_view<const volatile PrivateViewBase&>);
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static_assert(!std::ranges::enable_view<const volatile PrivateViewBase&&>);
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// Derives from view_base, but specializes enable_view to false
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struct EnableViewFalse : std::ranges::view_base { };
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template <> constexpr bool std::ranges::enable_view<EnableViewFalse> = false;
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static_assert(!std::ranges::enable_view<EnableViewFalse>);
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static_assert(!std::ranges::enable_view<EnableViewFalse&>);
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static_assert(!std::ranges::enable_view<EnableViewFalse&&>);
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static_assert(std::ranges::enable_view<const EnableViewFalse>);
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static_assert(!std::ranges::enable_view<const EnableViewFalse&>);
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static_assert(!std::ranges::enable_view<const EnableViewFalse&&>);
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static_assert(std::ranges::enable_view<volatile EnableViewFalse>);
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static_assert(!std::ranges::enable_view<volatile EnableViewFalse&>);
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static_assert(!std::ranges::enable_view<volatile EnableViewFalse&&>);
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static_assert(std::ranges::enable_view<const volatile EnableViewFalse>);
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static_assert(!std::ranges::enable_view<const volatile EnableViewFalse&>);
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static_assert(!std::ranges::enable_view<const volatile EnableViewFalse&&>);
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// Derives from view_base
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struct PublicViewBase : std::ranges::view_base { };
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static_assert(std::ranges::enable_view<PublicViewBase>);
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static_assert(!std::ranges::enable_view<PublicViewBase&>);
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static_assert(!std::ranges::enable_view<PublicViewBase&&>);
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static_assert(std::ranges::enable_view<const PublicViewBase>);
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static_assert(!std::ranges::enable_view<const PublicViewBase&>);
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static_assert(!std::ranges::enable_view<const PublicViewBase&&>);
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static_assert(std::ranges::enable_view<volatile PublicViewBase>);
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static_assert(!std::ranges::enable_view<volatile PublicViewBase&>);
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static_assert(!std::ranges::enable_view<volatile PublicViewBase&&>);
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static_assert(std::ranges::enable_view<const volatile PublicViewBase>);
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static_assert(!std::ranges::enable_view<const volatile PublicViewBase&>);
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static_assert(!std::ranges::enable_view<const volatile PublicViewBase&&>);
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// Does not derive from view_base, but specializes enable_view to true
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struct EnableViewTrue { };
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template <> constexpr bool std::ranges::enable_view<EnableViewTrue> = true;
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static_assert(std::ranges::enable_view<EnableViewTrue>);
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static_assert(!std::ranges::enable_view<EnableViewTrue&>);
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static_assert(!std::ranges::enable_view<EnableViewTrue&&>);
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static_assert(!std::ranges::enable_view<const EnableViewTrue>);
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static_assert(!std::ranges::enable_view<const EnableViewTrue&>);
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static_assert(!std::ranges::enable_view<const EnableViewTrue&&>);
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static_assert(!std::ranges::enable_view<volatile EnableViewTrue>);
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static_assert(!std::ranges::enable_view<volatile EnableViewTrue&>);
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static_assert(!std::ranges::enable_view<volatile EnableViewTrue&&>);
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static_assert(!std::ranges::enable_view<const volatile EnableViewTrue>);
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static_assert(!std::ranges::enable_view<const volatile EnableViewTrue&>);
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static_assert(!std::ranges::enable_view<const volatile EnableViewTrue&&>);
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// Make sure that enable_view is a bool, not some other contextually-convertible-to-bool type.
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ASSERT_SAME_TYPE(decltype(std::ranges::enable_view<Empty>), const bool);
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ASSERT_SAME_TYPE(decltype(std::ranges::enable_view<PublicViewBase>), const bool);
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struct V1 : std::ranges::view_interface<V1> {};
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static_assert(std::ranges::enable_view<V1>);
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static_assert(!std::ranges::enable_view<V1&>);
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static_assert(!std::ranges::enable_view<V1&&>);
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static_assert(std::ranges::enable_view<const V1>);
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static_assert(!std::ranges::enable_view<const V1&>);
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static_assert(!std::ranges::enable_view<const V1&&>);
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static_assert(std::ranges::enable_view<volatile V1>);
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static_assert(!std::ranges::enable_view<volatile V1&>);
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static_assert(!std::ranges::enable_view<volatile V1&&>);
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static_assert(std::ranges::enable_view<const volatile V1>);
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static_assert(!std::ranges::enable_view<const volatile V1&>);
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static_assert(!std::ranges::enable_view<const volatile V1&&>);
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struct V2 : std::ranges::view_interface<V1>, std::ranges::view_interface<V2> {};
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static_assert(!std::ranges::enable_view<V2>);
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static_assert(!std::ranges::enable_view<V2&>);
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static_assert(!std::ranges::enable_view<V2&&>);
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static_assert(!std::ranges::enable_view<const V2>);
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static_assert(!std::ranges::enable_view<const V2&>);
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static_assert(!std::ranges::enable_view<const V2&&>);
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static_assert(!std::ranges::enable_view<volatile V2>);
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static_assert(!std::ranges::enable_view<volatile V2&>);
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static_assert(!std::ranges::enable_view<volatile V2&&>);
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static_assert(!std::ranges::enable_view<const volatile V2>);
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static_assert(!std::ranges::enable_view<const volatile V2&>);
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static_assert(!std::ranges::enable_view<const volatile V2&&>);
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struct V3 : std::ranges::view_interface<V1> {};
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static_assert(std::ranges::enable_view<V3>);
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static_assert(!std::ranges::enable_view<V3&>);
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static_assert(!std::ranges::enable_view<V3&&>);
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static_assert(std::ranges::enable_view<const V3>);
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static_assert(!std::ranges::enable_view<const V3&>);
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static_assert(!std::ranges::enable_view<const V3&&>);
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static_assert(std::ranges::enable_view<volatile V3>);
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static_assert(!std::ranges::enable_view<volatile V3&>);
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static_assert(!std::ranges::enable_view<volatile V3&&>);
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static_assert(std::ranges::enable_view<const volatile V3>);
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static_assert(!std::ranges::enable_view<const volatile V3&>);
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static_assert(!std::ranges::enable_view<const volatile V3&&>);
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struct PrivateInherit : private std::ranges::view_interface<PrivateInherit> {};
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static_assert(!std::ranges::enable_view<PrivateInherit>);
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static_assert(!std::ranges::enable_view<const PrivateInherit>);
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static_assert(!std::ranges::enable_view<volatile PrivateInherit>);
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static_assert(!std::ranges::enable_view<const volatile PrivateInherit>);
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// https://github.com/llvm/llvm-project/issues/132577
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// enable_view<view_interface<T>> should be false.
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static_assert(!std::ranges::enable_view<std::ranges::view_interface<V1>>);
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static_assert(!std::ranges::enable_view<const std::ranges::view_interface<V1>>);
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static_assert(!std::ranges::enable_view<volatile std::ranges::view_interface<V1>>);
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static_assert(!std::ranges::enable_view<const volatile std::ranges::view_interface<V1>>);
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// ADL-proof
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struct Incomplete;
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template<class T> struct Holder { T t; };
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static_assert(!std::ranges::enable_view<Holder<Incomplete>*>);
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static_assert(!std::ranges::enable_view<const Holder<Incomplete>*>);
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static_assert(!std::ranges::enable_view<volatile Holder<Incomplete>*>);
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static_assert(!std::ranges::enable_view<const volatile Holder<Incomplete>*>);
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static_assert(!std::ranges::enable_view<void>);
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static_assert(!std::ranges::enable_view<const void>);
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static_assert(!std::ranges::enable_view<volatile void>);
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static_assert(!std::ranges::enable_view<const volatile void>);
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