62 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// <algorithm>10 11// template<RandomAccessIterator Iter, Callable<auto, Iter::difference_type> Rand>12// requires ShuffleIterator<Iter>13// && Convertible<Rand::result_type, Iter::difference_type>14// void15// random_shuffle(Iter first, Iter last, Rand&& rand);16 17// REQUIRES: c++03 || c++11 || c++1418// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS19 20#include <algorithm>21#include <cassert>22#include <cstddef>23 24#include "test_macros.h"25#include "test_iterators.h"26 27 28struct gen29{30 std::ptrdiff_t operator()(std::ptrdiff_t n)31 {32 return n-1;33 }34};35 36 37template <class Iter>38void39test_with_iterator()40{41 42 int ia[] = {1, 2, 3, 4};43 int ia1[] = {4, 1, 2, 3};44 const unsigned sa = sizeof(ia)/sizeof(ia[0]);45 gen r;46 47 std::random_shuffle(ia, ia+sa, r);48 LIBCPP_ASSERT(std::equal(ia, ia+sa, ia1));49 assert(std::is_permutation(ia, ia+sa, ia1));50 51 std::random_shuffle(ia, ia+sa, r);52 assert(std::is_permutation(ia, ia+sa, ia1));53}54 55 56int main(int, char**)57{58 test_with_iterator<random_access_iterator<int*> >();59 test_with_iterator<int*>();60 return 0;61}62