libcxx/test/std/containers/associative/set/set.erasure/erase_if.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 // UNSUPPORTED: c++03, c++11, c++14, c++17
   9
  10 // <set>
  11
  12 // template <class T, class Compare, class Allocator, class Predicate>
  13 //   typename set<T, Compare, Allocator>::size_type
  14 //   erase_if(set<T, Compare, Allocator>& c, Predicate pred);
  15
  16 #include <set>
  17
  18 #include "test_macros.h"
  19 #include "test_allocator.h"
  20 #include "min_allocator.h"
  21
  22 template <class S, class Pred>
  23 void test0(S s, Pred p, S expected, std::size_t expected_erased_count) {
  24   ASSERT_SAME_TYPE(typename S::size_type, decltype(std::erase_if(s, p)));
  25   assert(expected_erased_count == std::erase_if(s, p));
  26   assert(s == expected);
  27 }
  28
  29 template <typename S>
  30 void test()
  31 {
  32     auto is1 = [](auto v) { return v == 1;};
  33     auto is2 = [](auto v) { return v == 2;};
  34     auto is3 = [](auto v) { return v == 3;};
  35     auto is4 = [](auto v) { return v == 4;};
  36     auto True  = [](auto) { return true; };
  37     auto False = [](auto) { return false; };
  38
  39     test0(S(), is1, S(), 0);
  40
  41     test0(S({1}), is1, S(), 1);
  42     test0(S({1}), is2, S({1}), 0);
  43
  44     test0(S({1, 2}), is1, S({2}), 1);
  45     test0(S({1, 2}), is2, S({1}), 1);
  46     test0(S({1, 2}), is3, S({1, 2}), 0);
  47
  48     test0(S({1, 2, 3}), is1, S({2, 3}), 1);
  49     test0(S({1, 2, 3}), is2, S({1, 3}), 1);
  50     test0(S({1, 2, 3}), is3, S({1, 2}), 1);
  51     test0(S({1, 2, 3}), is4, S({1, 2, 3}), 0);
  52
  53     test0(S({1, 2, 3}), True, S(), 3);
  54     test0(S({1, 2, 3}), False, S({1, 2, 3}), 0);
  55 }
  56
  57 int main(int, char**)
  58 {
  59     test<std::set<int>>();
  60     test<std::set<int, std::less<int>, min_allocator<int>>> ();
  61     test<std::set<int, std::less<int>, test_allocator<int>>> ();
  62
  63     test<std::set<long>>();
  64     test<std::set<double>>();
  65
  66   return 0;
  67 }