Initial commit of AssEnum library

CMakeLists.txt

@@ -0,0 +1,41 @@
+cmake_minimum_required(VERSION 3.0.2) 
+
+project(assenum DESCRIPTION "AssociatedEnum: header-only library for C++ for enumerations with associated values.")
+
+if (NOT WIN32)
+    add_compile_options(-std=c++11)
+    if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+        add_compile_options(-stdlib=libc++)
+    endif()
+endif()
+
+if (APPLE)
+    set(CMAKE_OSX_DEPLOYMENT_TARGET "10.8")
+endif()
+
+OPTION(ASSENUM_TESTING_ENABLE "Build AssEnum's unit-tests." OFF)
+
+### assenum library ###
+
+add_library(assenum INTERFACE)
+
+target_include_directories(assenum INTERFACE "include")
+
+
+### assenum unit-tests ###
+
+if (ASSENUM_TESTING_ENABLE)
+    set(TEST_SOURCES
+        tests/AssEnumTest.cpp
+    )
+    add_executable(assenum_tests ${TEST_SOURCES})
+
+    # setup 3rdParty
+    add_subdirectory(3rdParty/googletest)
+    set_target_properties(gmock PROPERTIES FOLDER 3rdParty)
+    set_target_properties(gmock_main PROPERTIES FOLDER 3rdParty)
+    set_target_properties(gtest PROPERTIES FOLDER 3rdParty)
+    set_target_properties(gtest_main PROPERTIES FOLDER 3rdParty)
+
+    target_link_libraries(assenum_tests assenum gtest gmock gmock_main)
+endif()

include/assenum/assenum.h

@@ -0,0 +1,161 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Alkenso (Vladimir Vashurkin)
+ *
+ * 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.
+ */
+
+#pragma once
+
+#include <memory>
+
+/**
+ // ===== DECLARATION =====
+ enum class Setting
+ {
+     Host,
+     Port,
+     Timeout
+ };
+ 
+ // Declare associated enum 'AnySetting' with style of CamelCase without 'get' word in getters.
+ ASSENUM_DECLARE(AnySetting, Setting)
+ {
+     ASSENUM_DEFINE_STRUCTORS();
+     
+     ASSENUM_CASE_CC(Host, std::string);
+     ASSENUM_CASE_CC(Port, uint16_t);
+     ASSENUM_CASE_CC(Timeout, std::chrono::seconds);
+ };
+ 
+ 
+ //===== USAGE =====
+ void LogSetting(const AnySetting& setting)
+ {
+     switch (setting.type())
+     {
+         case Setting::Host:
+             std::cout << "Host: " << setting.Host() << "\n";
+             break;
+         case Setting::Port:
+             std::cout << "Port: " << setting.Port()<< "\n";
+             break;
+         case Setting::Timeout:
+             std::cout << "Timeout: " << setting.Timeout().count() << "\n";
+             break;
+         default:
+             break;
+     }
+ }
+ 
+ 
+ // ===== CREATION =====
+ LogSetting(AnySetting::CreateHost("test.api.com"));
+ LogSetting(AnySetting::CreatePort(65535));
+ LogSetting(AnySetting::CreateTimeout(std::chrono::seconds(1));
+ */
+
+
+#define ASSENUM_DECLARE(name, enum) \
+class name: protected AssEnum<enum, name>
+
+
+#define ASSENUM_DEFINE_STRUCTORS() \
+public: using AssEnum::type; \
+private: using AssEnum::AssEnum
+
+
+/// For enums named in CamelCase style
+#define ASSENUM_CASE_CC(case, type) ASSENUM_CASE_IMPL_NG(case, type, Create)
+/// With 'get' prefix on getter
+#define ASSENUM_CASE_CC_G(case, type) ASSENUM_CASE_IMPL_G(case, type, Create)
+
+/// For enums named in lowerCamelCase style
+#define ASSENUM_CASE_LCC(case, type) ASSENUM_CASE_IMPL_NG(case, type, create)
+/// With 'get' prefix on getter
+#define ASSENUM_CASE_LCC_G(case, type) ASSENUM_CASE_IMPL_G(case, type, create)
+
+/// For enums named in snake_case style
+#define ASSENUM_CASE_SC(case, type) ASSENUM_CASE_IMPL_NG(case, type, create_)
+/// With 'get' prefix on getter
+#define ASSENUM_CASE_SC_G(case, type) ASSENUM_CASE_IMPL_G(case, type, create_)
+
+
+// Private stuff
+
+#define ASSENUM_CASE_IMPL_NG(case, type, createToken) ASSENUM_CASE_IMPL(case, type, createToken, )
+#define ASSENUM_CASE_IMPL_G(case, type, createToken) ASSENUM_CASE_IMPL(case, type, createToken, get)
+
+#define ASSENUM_CASE_IMPL(case, type, createToken, getPrefix) \
+public: \
+    static ThisType createToken##case(type value) \
+    { \
+        return ThisType(AssociatedEnum::case, std::move(value)); \
+    } \
+    \
+    const type& getPrefix##case() const \
+    { \
+        return *reinterpret_cast<const type*>(validatedValueOfType(AssociatedEnum::case)); \
+    }
+
+
+namespace assenum
+{
+    namespace impl
+    {
+        template <typename Enum, typename ConcreteType>
+        class AssEnum
+        {
+        public:
+            using AssociatedEnum = Enum;
+            using ThisType = ConcreteType;
+
+            Enum type() const 
+            { 
+                return m_type; 
+            }
+
+            template <typename T>
+            AssEnum(const Enum type, T&& value)
+            : m_type(type)
+            , m_value(new T(std::forward<T>(value)), [] (void* ptr) {
+                if (ptr)
+                {
+                    delete reinterpret_cast<T*>(ptr);
+                }
+            })
+            {}
+
+            const void* validatedValueOfType(const Enum type) const
+            {
+                if (m_type != type)
+                {
+                    throw std::invalid_argument("Trying to get value of invalid type.");
+                }
+
+                return m_value.get();
+            }
+
+        private:
+            const Enum m_type;
+            const std::shared_ptr<void> m_value;
+        };
+    }
+}