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.
186 lines
7.3 KiB
C++
186 lines
7.3 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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// concept view = ...;
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#include <ranges>
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// The type would be a view, but it's not moveable.
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struct NotMoveable : std::ranges::view_base {
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NotMoveable() = default;
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NotMoveable(NotMoveable&&) = delete;
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NotMoveable& operator=(NotMoveable&&) = delete;
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friend int* begin(NotMoveable&);
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friend int* begin(NotMoveable const&);
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friend int* end(NotMoveable&);
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friend int* end(NotMoveable const&);
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};
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static_assert(std::ranges::range<NotMoveable>);
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static_assert(!std::movable<NotMoveable>);
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static_assert(std::default_initializable<NotMoveable>);
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static_assert(std::ranges::enable_view<NotMoveable>);
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static_assert(!std::ranges::view<NotMoveable>);
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// The type would be a view, but it's not default initializable
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struct NotDefaultInit : std::ranges::view_base {
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NotDefaultInit() = delete;
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friend int* begin(NotDefaultInit&);
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friend int* begin(NotDefaultInit const&);
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friend int* end(NotDefaultInit&);
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friend int* end(NotDefaultInit const&);
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};
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static_assert(std::ranges::range<NotDefaultInit>);
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static_assert(std::movable<NotDefaultInit>);
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static_assert(!std::default_initializable<NotDefaultInit>);
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static_assert(std::ranges::enable_view<NotDefaultInit>);
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static_assert(std::ranges::view<NotDefaultInit>);
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// The type would be a view, but it doesn't enable it with enable_view
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struct NotExplicitlyEnabled {
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NotExplicitlyEnabled() = default;
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NotExplicitlyEnabled(NotExplicitlyEnabled&&) = default;
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NotExplicitlyEnabled& operator=(NotExplicitlyEnabled&&) = default;
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friend int* begin(NotExplicitlyEnabled&);
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friend int* begin(NotExplicitlyEnabled const&);
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friend int* end(NotExplicitlyEnabled&);
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friend int* end(NotExplicitlyEnabled const&);
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};
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static_assert(std::ranges::range<NotExplicitlyEnabled>);
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static_assert(std::movable<NotExplicitlyEnabled>);
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static_assert(std::default_initializable<NotExplicitlyEnabled>);
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static_assert(!std::ranges::enable_view<NotExplicitlyEnabled>);
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static_assert(!std::ranges::view<NotExplicitlyEnabled>);
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// The type has everything else, but it's not a range
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struct NotARange : std::ranges::view_base {
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NotARange() = default;
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NotARange(NotARange&&) = default;
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NotARange& operator=(NotARange&&) = default;
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};
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static_assert(!std::ranges::range<NotARange>);
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static_assert(std::movable<NotARange>);
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static_assert(std::default_initializable<NotARange>);
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static_assert(std::ranges::enable_view<NotARange>);
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static_assert(!std::ranges::view<NotARange>);
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// The type satisfies all requirements
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struct View : std::ranges::view_base {
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View() = default;
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View(View&&) = default;
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View& operator=(View&&) = default;
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friend int* begin(View&);
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friend int* begin(View const&);
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friend int* end(View&);
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friend int* end(View const&);
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};
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static_assert(std::ranges::range<View>);
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static_assert(std::movable<View>);
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static_assert(std::default_initializable<View>);
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static_assert(std::ranges::enable_view<View>);
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static_assert(std::ranges::view<View>);
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// const view types
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struct ConstView1 : std::ranges::view_base {
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ConstView1(const ConstView1&&);
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const ConstView1& operator=(const ConstView1&&) const;
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friend void swap(const ConstView1&, const ConstView1&);
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friend int* begin(const ConstView1&);
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friend int* end(const ConstView1&);
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};
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static_assert(std::ranges::range<const ConstView1>);
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static_assert(std::movable<const ConstView1>);
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static_assert(!std::default_initializable<const ConstView1>);
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static_assert(std::ranges::enable_view<const ConstView1>);
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static_assert(std::ranges::view<const ConstView1>);
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struct ConstView2 : std::ranges::view_interface<ConstView2> {
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ConstView2(const ConstView2&&);
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const ConstView2& operator=(const ConstView2&&) const;
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friend void swap(const ConstView2&, const ConstView2&);
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friend int* begin(const ConstView2&);
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friend int* end(const ConstView2&);
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};
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static_assert(std::ranges::range<const ConstView2>);
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static_assert(std::movable<const ConstView2>);
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static_assert(!std::default_initializable<const ConstView2>);
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static_assert(std::ranges::enable_view<const ConstView2>);
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static_assert(std::ranges::view<const ConstView2>);
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// volatile view types
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struct VolatileView1 : std::ranges::view_base {
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VolatileView1(volatile VolatileView1&&);
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volatile VolatileView1& operator=(volatile VolatileView1&&) volatile;
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friend void swap(volatile VolatileView1&, volatile VolatileView1&);
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friend int* begin(volatile VolatileView1&);
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friend int* end(volatile VolatileView1&);
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};
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static_assert(std::ranges::range<volatile VolatileView1>);
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static_assert(std::movable<volatile VolatileView1>);
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static_assert(!std::default_initializable<volatile VolatileView1>);
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static_assert(std::ranges::enable_view<volatile VolatileView1>);
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static_assert(std::ranges::view<volatile VolatileView1>);
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struct VolatileView2 : std::ranges::view_interface<VolatileView2> {
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VolatileView2(volatile VolatileView2&&);
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volatile VolatileView2& operator=(volatile VolatileView2&&) volatile;
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friend void swap(volatile VolatileView2&, volatile VolatileView2&);
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friend int* begin(volatile VolatileView2&);
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friend int* end(volatile VolatileView2&);
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};
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static_assert(std::ranges::range<volatile VolatileView2>);
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static_assert(std::movable<volatile VolatileView2>);
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static_assert(!std::default_initializable<volatile VolatileView2>);
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static_assert(std::ranges::enable_view<volatile VolatileView2>);
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static_assert(std::ranges::view<volatile VolatileView2>);
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// const-volatile view types
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struct ConstVolatileView1 : std::ranges::view_base {
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ConstVolatileView1(const volatile ConstVolatileView1&&);
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const volatile ConstVolatileView1& operator=(const volatile ConstVolatileView1&&) const volatile;
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friend void swap(const volatile ConstVolatileView1&, const volatile ConstVolatileView1&);
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friend int* begin(const volatile ConstVolatileView1&);
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friend int* end(const volatile ConstVolatileView1&);
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};
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static_assert(std::ranges::range<const volatile ConstVolatileView1>);
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static_assert(std::movable<const volatile ConstVolatileView1>);
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static_assert(!std::default_initializable<const volatile ConstVolatileView1>);
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static_assert(std::ranges::enable_view<const volatile ConstVolatileView1>);
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static_assert(std::ranges::view<const volatile ConstVolatileView1>);
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struct ConstVolatileView2 : std::ranges::view_interface<ConstVolatileView2> {
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ConstVolatileView2(const volatile ConstVolatileView2&&);
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const volatile ConstVolatileView2& operator=(const volatile ConstVolatileView2&&) const volatile;
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friend void swap(const volatile ConstVolatileView2&, const volatile ConstVolatileView2&);
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friend int* begin(const volatile ConstVolatileView2&);
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friend int* end(const volatile ConstVolatileView2&);
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};
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static_assert(std::ranges::range<const volatile ConstVolatileView2>);
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static_assert(std::movable<const volatile ConstVolatileView2>);
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static_assert(!std::default_initializable<const volatile ConstVolatileView2>);
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static_assert(std::ranges::enable_view<const volatile ConstVolatileView2>);
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static_assert(std::ranges::view<const volatile ConstVolatileView2>);
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