libcxx/test/std/algorithms/alg.modifying.operations/alg.replace/pstl.replace.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 // UNSUPPORTED: c++03, c++11, c++14
  10 // UNSUPPORTED: libcpp-has-no-incomplete-pstl
  11
  12 // template<class ExecutionPolicy, class ForwardIterator, class T>
  13 //   void replace(ExecutionPolicy&& exec,
  14 //                ForwardIterator first, ForwardIterator last,
  15 //                const T& old_value, const T& new_value);
  16
  17 #include <algorithm>
  18 #include <array>
  19 #include <cassert>
  20 #include <vector>
  21
  22 #include "type_algorithms.h"
  23 #include "test_execution_policies.h"
  24 #include "test_iterators.h"
  25
  26 template <class Iter>
  27 struct Test {
  28   template <class ExecutionPolicy>
  29   void operator()(ExecutionPolicy&& policy) {
  30     { // simple test
  31       std::array a = {1, 2, 3, 4, 5, 6, 7, 8};
  32       std::replace(policy, Iter(std::begin(a)), Iter(std::end(a)), 3, 6);
  33       assert((a == std::array{1, 2, 6, 4, 5, 6, 7, 8}));
  34     }
  35
  36     { // empty range works
  37       std::array<int, 0> a = {};
  38       std::replace(policy, Iter(std::begin(a)), Iter(std::end(a)), 3, 6);
  39     }
  40
  41     { // non-empty range without a match works
  42       std::array a = {1, 2};
  43       std::replace(policy, Iter(std::begin(a)), Iter(std::end(a)), 3, 6);
  44     }
  45
  46     { // single element range works
  47       std::array a = {3};
  48       std::replace(policy, Iter(std::begin(a)), Iter(std::end(a)), 3, 6);
  49       assert((a == std::array{6}));
  50     }
  51
  52     { // two element range works
  53       std::array a = {3, 4};
  54       std::replace(policy, Iter(std::begin(a)), Iter(std::end(a)), 3, 6);
  55       assert((a == std::array{6, 4}));
  56     }
  57
  58     { // multiple matching elements work
  59       std::array a = {1, 2, 3, 4, 3, 3, 5, 6, 3};
  60       std::replace(policy, Iter(std::begin(a)), Iter(std::end(a)), 3, 9);
  61       assert((a == std::array{1, 2, 9, 4, 9, 9, 5, 6, 9}));
  62     }
  63
  64     { // large range works
  65       std::vector<int> a(150, 3);
  66       a[45] = 5;
  67       std::replace(policy, Iter(std::data(a)), Iter(std::data(a) + std::size(a)), 3, 6);
  68
  69       std::vector<int> comp(150, 6);
  70       comp[45] = 5;
  71       assert(std::equal(a.begin(), a.end(), comp.begin()));
  72     }
  73   }
  74 };
  75
  76 int main(int, char**) {
  77   types::for_each(types::forward_iterator_list<int*>{}, TestIteratorWithPolicies<Test>{});
  78
  79   return 0;
  80 }