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> 14 // requires ShuffleIterator<Iter> 15 // void 16 // random_shuffle(Iter first, Iter last); 17 18 #include <algorithm> 19 #include <cassert> 20 21 #include "test_macros.h" 22 23 int main() 24 { 25 int ia[] = {1, 2, 3, 4}; 26 int ia1[] = {1, 4, 3, 2}; 27 int ia2[] = {4, 1, 2, 3}; 28 const unsigned sa = sizeof(ia)/sizeof(ia[0]); 29 std::random_shuffle(ia, ia+sa); 30 LIBCPP_ASSERT(std::equal(ia, ia+sa, ia1)); 31 assert(std::is_permutation(ia, ia+sa, ia1)); 32 std::random_shuffle(ia, ia+sa); 33 LIBCPP_ASSERT(std::equal(ia, ia+sa, ia2)); 34 assert(std::is_permutation(ia, ia+sa, ia2)); 35 } 36
