66 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// class std::ranges::subrange;12 13#include <ranges>14 15#include <cassert>16#include "test_iterators.h"17#include "types.h"18 19constexpr bool test() {20 int buff[] = {1, 2, 3, 4, 5};21 22 {23 std::ranges::subrange<MoveOnlyForwardIter, int*> a(MoveOnlyForwardIter(buff), buff + 5, 5);24 assert(base(a.begin()) == buff);25 assert(!a.empty());26 assert(a.size() == 5);27 }28 29 {30 std::ranges::subrange<ForwardIter> b(ForwardIter(nullptr), ForwardIter(nullptr));31 assert(b.empty());32 }33 34 {35 std::ranges::subrange<ForwardIter> c{ForwardIter(buff), ForwardIter(buff)};36 assert(c.empty());37 }38 39 {40 std::ranges::subrange<ForwardIter> d(ForwardIter(buff), ForwardIter(buff + 1));41 assert(!d.empty());42 }43 44 {45 bool minusWasCalled = false;46 SizedSentinelForwardIter beg(buff, &minusWasCalled), end(buff + 5, &minusWasCalled);47 std::ranges::subrange<SizedSentinelForwardIter> e(beg, end, 5);48 assert(!e.empty());49 50 // Make sure that operator- is used to calculate size when possible.51 minusWasCalled = false;52 assert(e.size() == 5);53 assert(minusWasCalled);54 }55 56 return true;57}58 59 60int main(int, char**) {61 test();62 static_assert(test());63 64 return 0;65}66