//===----------------------------------------------------------------------===// // // The LLVM Compiler Infrastructure // // This file is dual licensed under the MIT and the University of Illinois Open // Source Licenses. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // <algorithm> // template<RandomAccessIterator Iter, Callable<auto, Iter::difference_type> Rand> // requires ShuffleIterator<Iter> // && Convertible<Rand::result_type, Iter::difference_type> // void // random_shuffle(Iter first, Iter last, Rand&& rand); #include <algorithm> #include <cassert> struct gen { int operator()(int n) { return n-1; } }; int main() { int ia[] = {1, 2, 3, 4}; int ia1[] = {4, 1, 2, 3}; const unsigned sa = sizeof(ia)/sizeof(ia[0]); gen r; std::random_shuffle(ia, ia+sa, r); assert(std::equal(ia, ia+sa, ia1)); }