1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // <algorithm> 11 // REQUIRES: c++98 || c++03 || c++11 || c++14 12 13 // template<RandomAccessIterator Iter, Callable<auto, Iter::difference_type> Rand> 14 // requires ShuffleIterator<Iter> 15 // && Convertible<Rand::result_type, Iter::difference_type> 16 // void 17 // random_shuffle(Iter first, Iter last, Rand&& rand); 18 19 #include <algorithm> 20 #include <cassert> 21 #include <cstddef> 22 23 #include "test_macros.h" 24 25 struct gen 26 { 27 std::ptrdiff_t operator()(std::ptrdiff_t n) 28 { 29 return n-1; 30 } 31 }; 32 33 int main() 34 { 35 int ia[] = {1, 2, 3, 4}; 36 int ia1[] = {4, 1, 2, 3}; 37 const unsigned sa = sizeof(ia)/sizeof(ia[0]); 38 gen r; 39 std::random_shuffle(ia, ia+sa, r); 40 LIBCPP_ASSERT(std::equal(ia, ia+sa, ia1)); 41 assert(std::is_permutation(ia, ia+sa, ia1)); 42 } 43
