libcxx/test/std/algorithms/alg.modifying.operations/alg.fill/pstl.fill_n.pass.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 // <algorithm>
  10
  11 // UNSUPPORTED: c++03, c++11, c++14
  12
  13 // UNSUPPORTED: libcpp-has-no-incomplete-pstl
  14
  15 // template<class ExecutionPolicy, class ForwardIterator, class Size, class T>
  16 //   ForwardIterator fill_n(ExecutionPolicy&& exec,
  17 //                          ForwardIterator first, Size n, const T& value);
  18
  19 #include <algorithm>
  20 #include <cassert>
  21 #include <vector>
  22
  23 #include "test_macros.h"
  24 #include "test_execution_policies.h"
  25 #include "test_iterators.h"
  26
  27 EXECUTION_POLICY_SFINAE_TEST(fill_n);
  28
  29 static_assert(sfinae_test_fill_n<int, int*, int*, bool (*)(int)>);
  30 static_assert(!sfinae_test_fill_n<std::execution::parallel_policy, int*, int*, int>);
  31
  32 template <class Iter>
  33 struct Test {
  34   template <class Policy>
  35   void operator()(Policy&& policy) {
  36     { // simple test
  37       int a[4];
  38       std::fill_n(policy, Iter(std::begin(a)), std::size(a), 33);
  39       assert(std::all_of(std::begin(a), std::end(a), [](int i) { return i == 33; }));
  40     }
  41     { // check that an empty range works
  42       int a[1] = {2};
  43       std::fill_n(policy, Iter(std::begin(a)), 0, 33);
  44       assert(a[0] == 2);
  45     }
  46     { // check that a one-element range works
  47       int a[1];
  48       std::fill_n(policy, Iter(std::begin(a)), std::size(a), 33);
  49       assert(std::all_of(std::begin(a), std::end(a), [](int i) { return i == 33; }));
  50     }
  51     { // check that a two-element range works
  52       int a[2];
  53       std::fill_n(policy, Iter(std::begin(a)), std::size(a), 33);
  54       assert(std::all_of(std::begin(a), std::end(a), [](int i) { return i == 33; }));
  55     }
  56     { // check that a large range works
  57       std::vector<int> a(234, 2);
  58       std::fill_n(policy, Iter(std::data(a)), std::size(a), 33);
  59       assert(std::all_of(std::begin(a), std::end(a), [](int i) { return i == 33; }));
  60     }
  61   }
  62 };
  63
  64 int main(int, char**) {
  65   types::for_each(types::forward_iterator_list<int*>{}, TestIteratorWithPolicies<Test>{});
  66
  67   return 0;
  68 }