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 12 // template<RandomAccessIterator Iter> 13 // requires ShuffleIterator<Iter> 14 // void 15 // random_shuffle(Iter first, Iter last); 16 17 #include <algorithm> 18 #include <cassert> 19 20 #include "test_macros.h" 21 22 int main() 23 { 24 int ia[] = {1, 2, 3, 4}; 25 int ia1[] = {1, 4, 3, 2}; 26 int ia2[] = {4, 1, 2, 3}; 27 const unsigned sa = sizeof(ia)/sizeof(ia[0]); 28 std::random_shuffle(ia, ia+sa); 29 LIBCPP_ASSERT(std::equal(ia, ia+sa, ia1)); 30 assert(std::is_permutation(ia, ia+sa, ia1)); 31 std::random_shuffle(ia, ia+sa); 32 LIBCPP_ASSERT(std::equal(ia, ia+sa, ia2)); 33 assert(std::is_permutation(ia, ia+sa, ia2)); 34 } 35
