libcxx/test/std/containers/sequences/list/list.erasure/erase.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 // <list>
  11
  12 // template <class T, class Allocator, class U>
  13 //   typename list<T, Allocator>::size_type
  14 //   erase(list<T, Allocator>& c, const U& value);
  15
  16 #include <list>
  17 #include <optional>
  18
  19 #include "test_macros.h"
  20 #include "test_allocator.h"
  21 #include "min_allocator.h"
  22
  23 template <class S, class U>
  24 void test0(S s, U val, S expected, size_t expected_erased_count) {
  25   ASSERT_SAME_TYPE(typename S::size_type, decltype(std::erase(s, val)));
  26   assert(expected_erased_count == std::erase(s, val));
  27   assert(s == expected);
  28 }
  29
  30 template <class S>
  31 void test()
  32 {
  33   test0(S(), 1, S(), 0);
  34
  35   test0(S({1}), 1, S(), 1);
  36   test0(S({1}), 2, S({1}), 0);
  37
  38   test0(S({1, 2}), 1, S({2}), 1);
  39   test0(S({1, 2}), 2, S({1}), 1);
  40   test0(S({1, 2}), 3, S({1, 2}), 0);
  41   test0(S({1, 1}), 1, S(), 2);
  42   test0(S({1, 1}), 3, S({1, 1}), 0);
  43
  44   test0(S({1, 2, 3}), 1, S({2, 3}), 1);
  45   test0(S({1, 2, 3}), 2, S({1, 3}), 1);
  46   test0(S({1, 2, 3}), 3, S({1, 2}), 1);
  47   test0(S({1, 2, 3}), 4, S({1, 2, 3}), 0);
  48
  49   test0(S({1, 1, 1}), 1, S(), 3);
  50   test0(S({1, 1, 1}), 2, S({1, 1, 1}), 0);
  51   test0(S({1, 1, 2}), 1, S({2}), 2);
  52   test0(S({1, 1, 2}), 2, S({1, 1}), 1);
  53   test0(S({1, 1, 2}), 3, S({1, 1, 2}), 0);
  54   test0(S({1, 2, 2}), 1, S({2, 2}), 1);
  55   test0(S({1, 2, 2}), 2, S({1}), 2);
  56   test0(S({1, 2, 2}), 3, S({1, 2, 2}), 0);
  57
  58   //  Test cross-type erasure
  59   using opt = std::optional<typename S::value_type>;
  60   test0(S({1, 2, 1}), opt(), S({1, 2, 1}), 0);
  61   test0(S({1, 2, 1}), opt(1), S({2}), 2);
  62   test0(S({1, 2, 1}), opt(2), S({1, 1}), 1);
  63   test0(S({1, 2, 1}), opt(3), S({1, 2, 1}), 0);
  64 }
  65
  66 int main(int, char**)
  67 {
  68     test<std::list<int>>();
  69     test<std::list<int, min_allocator<int>>> ();
  70     test<std::list<int, test_allocator<int>>> ();
  71
  72     test<std::list<long>>();
  73     test<std::list<double>>();
  74
  75   return 0;
  76 }