108 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++14, c++1710 11// constexpr W operator*() const noexcept(is_nothrow_copy_constructible_v<W>);12 13#include "test_macros.h"14 15TEST_CLANG_DIAGNOSTIC_IGNORED("-Wsign-compare")16TEST_GCC_DIAGNOSTIC_IGNORED("-Wsign-compare")17TEST_MSVC_DIAGNOSTIC_IGNORED(4018) // various "signed/unsigned mismatch"18 19#include <ranges>20#include <cassert>21 22#include "../types.h"23 24struct NotNoexceptCopy {25 using difference_type = int;26 27 int value_;28 constexpr explicit NotNoexceptCopy(int value = 0) : value_(value) {}29 constexpr NotNoexceptCopy(const NotNoexceptCopy& other) noexcept(false) : value_(other.value_) {}30 31 bool operator==(const NotNoexceptCopy&) const = default;32 33 friend constexpr NotNoexceptCopy& operator+=(NotNoexceptCopy &lhs, const NotNoexceptCopy& rhs) {34 lhs.value_ += rhs.value_; return lhs;35 }36 friend constexpr NotNoexceptCopy& operator-=(NotNoexceptCopy &lhs, const NotNoexceptCopy& rhs) {37 lhs.value_ -= rhs.value_; return lhs;38 }39 40 friend constexpr NotNoexceptCopy operator+(NotNoexceptCopy lhs, NotNoexceptCopy rhs) {41 return NotNoexceptCopy{lhs.value_ + rhs.value_};42 }43 friend constexpr int operator-(NotNoexceptCopy lhs, NotNoexceptCopy rhs) {44 return lhs.value_ - rhs.value_;45 }46 47 constexpr NotNoexceptCopy& operator++() { ++value_; return *this; }48 constexpr void operator++(int) { ++value_; }49};50 51template<class T>52constexpr void testType() {53 {54 std::ranges::iota_view<T> io(T(0));55 auto iter = io.begin();56 for (int i = 0; i < 100; ++i, ++iter)57 assert(*iter == T(i));58 59 static_assert(noexcept(*iter) == !std::same_as<T, NotNoexceptCopy>);60 }61 {62 std::ranges::iota_view<T> io(T(10));63 auto iter = io.begin();64 for (int i = 10; i < 100; ++i, ++iter)65 assert(*iter == T(i));66 }67 {68 const std::ranges::iota_view<T> io(T(0));69 auto iter = io.begin();70 for (int i = 0; i < 100; ++i, ++iter)71 assert(*iter == T(i));72 }73 {74 const std::ranges::iota_view<T> io(T(10));75 auto iter = io.begin();76 for (int i = 10; i < 100; ++i, ++iter)77 assert(*iter == T(i));78 }79}80 81constexpr bool test() {82 testType<SomeInt>();83 testType<NotNoexceptCopy>();84 testType<signed long>();85 testType<unsigned long>();86 testType<int>();87 testType<unsigned>();88 testType<short>();89 testType<unsigned short>();90 91 // Tests a mix of signed unsigned types.92 {93 const std::ranges::iota_view<int, unsigned> io(0, 10);94 auto iter = io.begin();95 for (int i = 0; i < 10; ++i, ++iter)96 assert(*iter == i);97 }98 99 return true;100}101 102int main(int, char**) {103 test();104 static_assert(test());105 106 return 0;107}108