libcxx/test/std/containers/container.adaptors/flat.map/flat.map.modifiers/clear.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, c++17, c++20
  10
  11 // <flat_map>
  12
  13 // class flat_map
  14
  15 // void clear() noexcept;
  16
  17 #include <cassert>
  18 #include <deque>
  19 #include <flat_map>
  20 #include <functional>
  21 #include <vector>
  22
  23 #include "MinSequenceContainer.h"
  24 #include "../helpers.h"
  25 #include "test_macros.h"
  26 #include "min_allocator.h"
  27
  28 // test noexcept
  29
  30 template <class T>
  31 concept NoExceptClear = requires(T t) {
  32   { t.clear() } noexcept;
  33 };
  34
  35 static_assert(NoExceptClear<std::flat_map<int, int>>);
  36 #ifndef TEST_HAS_NO_EXCEPTIONS
  37 static_assert(
  38     NoExceptClear<std::flat_map<int, int, std::less<int>, ThrowOnMoveContainer<int>, ThrowOnMoveContainer<int>>>);
  39 #endif
  40
  41 template <class KeyContainer, class ValueContainer>
  42 void test() {
  43   using Key   = typename KeyContainer::value_type;
  44   using Value = typename ValueContainer::value_type;
  45   using M     = std::flat_map<Key, Value, std::less<Key>, KeyContainer, ValueContainer>;
  46
  47   M m = {{1, 2}, {2, 1}, {3, 3}, {4, 1}, {5, 0}};
  48   assert(m.size() == 5);
  49   ASSERT_NOEXCEPT(m.clear());
  50   ASSERT_SAME_TYPE(decltype(m.clear()), void);
  51   m.clear();
  52   assert(m.size() == 0);
  53 }
  54
  55 int main(int, char**) {
  56   test<std::vector<int>, std::vector<int>>();
  57   test<std::vector<int>, std::vector<double>>();
  58   test<std::deque<int>, std::vector<double>>();
  59   test<MinSequenceContainer<int>, MinSequenceContainer<double>>();
  60   test<std::vector<int, min_allocator<int>>, std::vector<double, min_allocator<double>>>();
  61   test<std::vector<int, min_allocator<int>>, std::vector<int, min_allocator<int>>>();
  62
  63   return 0;
  64 }