libcxx/test/std/algorithms/alg.modifying.operations/alg.random.sample/sample.verify.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-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // UNSUPPORTED: c++03, c++11, c++14
  10
  11 // <algorithm>
  12
  13 // template <class PopulationIterator, class SampleIterator, class Distance,
  14 //           class UniformRandomNumberGenerator>
  15 // SampleIterator sample(PopulationIterator first, PopulationIterator last,
  16 //                       SampleIterator out, Distance n,
  17 //                       UniformRandomNumberGenerator &&g);
  18
  19 #include <algorithm>
  20 #include <random>
  21 #include <cassert>
  22
  23 #include "test_iterators.h"
  24
  25 template <class PopulationIterator, class SampleIterator> void test() {
  26   int ia[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
  27   const unsigned is = sizeof(ia) / sizeof(ia[0]);
  28   const unsigned os = 4;
  29   int oa[os];
  30   std::minstd_rand g;
  31   std::sample(PopulationIterator(ia), PopulationIterator(ia + is),
  32                             SampleIterator(oa), os, g);
  33 }
  34
  35 int main(int, char**) {
  36   // expected-error-re@*:* {{static assertion failed{{( due to requirement '.*')?}}{{.*}}SampleIterator must meet the requirements of RandomAccessIterator}}
  37   // expected-error@*:* 2 {{does not provide a subscript operator}}
  38   // expected-error@*:* {{invalid operands}}
  39   test<cpp17_input_iterator<int *>, cpp17_output_iterator<int *> >();
  40
  41   return 0;
  42 }