libcxx/test/support/test_execution_policies.h

   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 #ifndef TEST_SUPPORT_TEST_EXECUTION_POLICIES
  10 #define TEST_SUPPORT_TEST_EXECUTION_POLICIES
  11
  12 #include <cstdlib>
  13 #include <exception>
  14 #include <execution>
  15 #include <type_traits>
  16 #include <utility>
  17
  18 #include "test_macros.h"
  19
  20 #define EXECUTION_POLICY_SFINAE_TEST(function)                                                                         \
  21   template <class, class...>                                                                                           \
  22   struct sfinae_test_##function##_impl : std::true_type {};                                                            \
  23                                                                                                                        \
  24   template <class... Args>                                                                                             \
  25   struct sfinae_test_##function##_impl<std::void_t<decltype(std::function(std::declval<Args>()...))>, Args...>         \
  26       : std::false_type {};                                                                                            \
  27                                                                                                                        \
  28   template <class... Args>                                                                                             \
  29   constexpr bool sfinae_test_##function = sfinae_test_##function##_impl<void, Args...>::value;
  30
  31 template <class Functor>
  32 bool test_execution_policies(Functor func) {
  33   func(std::execution::seq);
  34 #if TEST_STD_VER >= 20
  35   func(std::execution::unseq);
  36 #endif
  37   func(std::execution::par);
  38   func(std::execution::par_unseq);
  39
  40   return true;
  41 }
  42
  43 template <template <class Iter> class TestClass>
  44 struct TestIteratorWithPolicies {
  45   template <class Iter>
  46   void operator()() {
  47     test_execution_policies(TestClass<Iter>{});
  48   }
  49 };
  50
  51 struct Bool {
  52   bool b_;
  53   Bool() = default;
  54   Bool(bool b) : b_(b) {}
  55
  56   operator bool&() {
  57     return b_;
  58   }
  59 };
  60
  61 #endif // TEST_SUPPORT_TEST_EXECUTION_POLICIES