git subrepo clone --branch=20.41.6 git@github.com:ETLCPP/etl.git components/etl

subrepo:
  subdir:   "components/etl"
  merged:   "be5537ec"
upstream:
  origin:   "git@github.com:ETLCPP/etl.git"
  branch:   "20.41.6"
  commit:   "be5537ec"
git-subrepo:
  version:  "0.4.9"
  origin:   "???"
  commit:   "???"

components/etl/test/test_overload.cpp

@@ -0,0 +1,168 @@
+/******************************************************************************
+The MIT License(MIT)
+
+Embedded Template Library.
+https://github.com/ETLCPP/etl
+https://www.etlcpp.com
+
+Copyright(c) 2015 John Wellbelove
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files(the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions :
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+******************************************************************************/
+
+#include "unit_test_framework.h"
+
+#include "etl/overload.h"
+
+#if ETL_USING_CPP11
+
+#include <iostream>
+
+namespace
+{
+  struct Result
+  {
+    Result()
+      : bi(false)
+      , bd(false)
+      , bs(false)
+    {
+    }
+
+    void clear()
+    {
+      bi = false;
+      bd = false;
+      bs = false;
+    }
+
+    bool bi;
+    bool bd;
+    bool bs;
+  };
+
+  Result result;
+
+  struct Visitor
+  {
+    void operator ()(int) { result.bi = true; }
+    void operator ()(double) { result.bd = true; }
+    void operator ()(const std::string&) { result.bs = true; }
+  };
+
+  template <typename T, typename TOverload>
+  void Function(T value, TOverload&& ol)
+  {
+    ol(value);
+  }
+
+  SUITE(test_overload)
+  {
+    //*************************************************************************
+    TEST(test_overload_lambdas_make_overload)
+    {
+      auto overload = etl::make_overload([](int) { result.bi = true; },
+                                         [](double) { result.bd = true; },
+                                         [](const std::string&) { result.bs = true; });
+
+      result.clear();
+      Function(1, overload);
+      CHECK(result.bi == true);
+      CHECK(result.bd == false);
+      CHECK(result.bs == false);
+
+      result.clear();
+      Function(2.0, overload);
+      CHECK(result.bi == false);
+      CHECK(result.bd == true);
+      CHECK(result.bs == false);
+
+      result.clear();
+      Function(std::string("3"), overload);
+      CHECK(result.bi == false);
+      CHECK(result.bd == false);
+      CHECK(result.bs == true);
+    }
+
+#if ETL_USING_CPP_17
+    //*************************************************************************
+    TEST(test_overload_lambdas_initializer_list)
+    {
+      result.clear();
+      Function(1, etl::overload
+                       {
+                         [](int) { result.bi = true; },
+                         [](double) { result.bd = true; },
+                         [](const std::string&) { result.bs = true; }
+                       });
+      CHECK(result.bi == true);
+      CHECK(result.bd == false);
+      CHECK(result.bs == false);
+
+      result.clear();
+      Function(2.0, etl::overload
+                            {
+                              [](int) { result.bi = true; },
+                              [](double) { result.bd = true; },
+                              [](const std::string&) { result.bs = true; }
+                            });
+      CHECK(result.bi == false);
+      CHECK(result.bd == true);
+      CHECK(result.bs == false);
+
+      result.clear();
+      Function(std::string("3"), etl::overload
+                                 {
+                                   [](int) { result.bi = true; },
+                                   [](double) { result.bd = true; },
+                                   [](const std::string&) { result.bs = true; }
+                                 });
+      CHECK(result.bi == false);
+      CHECK(result.bd == false);
+      CHECK(result.bs == true);
+    }
+#endif
+
+    //*************************************************************************
+    TEST(test_visitor_overload)
+    {
+      auto overload = etl::make_overload(Visitor());
+
+      result.clear();
+      Function(1, overload);
+      CHECK(result.bi == true);
+      CHECK(result.bd == false);
+      CHECK(result.bs == false);
+
+      result.clear();
+      Function(2.0, overload);
+      CHECK(result.bi == false);
+      CHECK(result.bd == true);
+      CHECK(result.bs == false);
+
+      result.clear();
+      Function(std::string("3"), overload);
+      CHECK(result.bi == false);
+      CHECK(result.bd == false);
+      CHECK(result.bs == true);
+    }
+  };
+}
+
+#endif