libcxx/test/std/containers/associative/multimap/multimap.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 // <map>
  11
  12 // template <class Key, class T, class Compare, class Allocator, class Predicate>
  13 //   typename multimap<Key, T, Compare, Allocator>::size_type
  14 //   erase_if(multimap<Key, T, Compare, Allocator>& c, Predicate pred);
  15
  16 #include <map>
  17
  18 #include "test_macros.h"
  19 #include "test_allocator.h"
  20 #include "min_allocator.h"
  21
  22 using Init = std::initializer_list<int>;
  23 template <typename M>
  24 M make (Init vals)
  25 {
  26     M ret;
  27     for (int v : vals)
  28         ret.emplace(static_cast<typename M::key_type>(v), static_cast<typename M::mapped_type>(v + 10));
  29     return ret;
  30 }
  31
  32 template <typename M, typename Pred>
  33 void test0(Init vals, Pred p, Init expected, std::size_t expected_erased_count) {
  34   M s = make<M>(vals);
  35   ASSERT_SAME_TYPE(typename M::size_type, decltype(std::erase_if(s, p)));
  36   assert(expected_erased_count == std::erase_if(s, p));
  37   assert(s == make<M>(expected));
  38 }
  39
  40 template <typename S>
  41 void test()
  42 {
  43     auto is1 = [](auto v) { return v.first == 1;};
  44     auto is2 = [](auto v) { return v.first == 2;};
  45     auto is3 = [](auto v) { return v.first == 3;};
  46     auto is4 = [](auto v) { return v.first == 4;};
  47     auto True  = [](auto) { return true; };
  48     auto False = [](auto) { return false; };
  49
  50     test0<S>({}, is1, {}, 0);
  51
  52     test0<S>({1}, is1, {}, 1);
  53     test0<S>({1}, is2, {1}, 0);
  54
  55     test0<S>({1, 2}, is1, {2}, 1);
  56     test0<S>({1, 2}, is2, {1}, 1);
  57     test0<S>({1, 2}, is3, {1, 2}, 0);
  58     test0<S>({1, 1}, is1, {}, 2);
  59     test0<S>({1, 1}, is3, {1, 1}, 0);
  60
  61     test0<S>({1, 2, 3}, is1, {2, 3}, 1);
  62     test0<S>({1, 2, 3}, is2, {1, 3}, 1);
  63     test0<S>({1, 2, 3}, is3, {1, 2}, 1);
  64     test0<S>({1, 2, 3}, is4, {1, 2, 3}, 0);
  65
  66     test0<S>({1, 1, 1}, is1, {}, 3);
  67     test0<S>({1, 1, 1}, is2, {1, 1, 1}, 0);
  68     test0<S>({1, 1, 2}, is1, {2}, 2);
  69     test0<S>({1, 1, 2}, is2, {1, 1}, 1);
  70     test0<S>({1, 1, 2}, is3, {1, 1, 2}, 0);
  71     test0<S>({1, 2, 2}, is1, {2, 2}, 1);
  72     test0<S>({1, 2, 2}, is2, {1}, 2);
  73     test0<S>({1, 2, 2}, is3, {1, 2, 2}, 0);
  74
  75     test0<S>({1, 2, 3}, True, {}, 3);
  76     test0<S>({1, 2, 3}, False, {1, 2, 3}, 0);
  77 }
  78
  79 int main(int, char**)
  80 {
  81     test<std::multimap<int, int>>();
  82     test<std::multimap<int, int, std::less<int>, min_allocator<std::pair<const int, int>>>> ();
  83     test<std::multimap<int, int, std::less<int>, test_allocator<std::pair<const int, int>>>> ();
  84
  85     test<std::multimap<long, short>>();
  86     test<std::multimap<short, double>>();
  87
  88   return 0;
  89 }