Initial sml version support added

recipes/sml/all/conandata.yml

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+sources:
+  "1.1.4":
+    url: https://github.com/boost-ext/sml/archive/v1.1.4.tar.gz
+    sha256: 897c78077f5a4d22b0de253b8689a8ea6d8adfba8d7b4877d6f5c76277e00976

recipes/sml/all/conanfile.py

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+from conans import ConanFile, tools
+from conans.tools import check_min_cppstd
+from conans.errors import ConanInvalidConfiguration
+import os
+
+
+class SMLConan(ConanFile):
+    name = "sml"
+    homepage = "https://github.com/boost-ext/sml"
+    description = "SML: C++14 State Machine Library"
+    topics = ("state-machine", "metaprogramming", "design-patterns", "sml")
+    license = "BSL-1.0"
+    url = "https://github.com/conan-io/conan-center-index"
+    settings = "compiler"
+    no_copy_source = True
+
+    @property
+    def _source_subfolder(self):
+        return "source_subfolder"
+
+    @property 
+    def _minimum_compilers_version(self): 
+        return {
+            "Visual Studio": "15", 
+            "gcc": "5", 
+            "clang": "5", 
+            "apple-clang": "5.1", 
+        } 
+
+    def configure(self):
+        if self.settings.compiler.cppstd: 
+            check_min_cppstd(self, "14")
+        minimum_version = self._minimum_compilers_version.get(str(self.settings.compiler), False) 
+        if not minimum_version: 
+            self.output.warn("SML requires C++14. Your compiler is unknown. Assuming it supports C++14.") 
+        elif tools.Version(self.settings.compiler.version) < minimum_version: 
+            raise ConanInvalidConfiguration("SML requires C++14, which your compiler does not support.") 
+
+    def source(self):
+        tools.get(**self.conan_data["sources"][self.version])
+        extracted_dir = "sml-" + self.version
+        os.rename(extracted_dir, self._source_subfolder)
+
+    def package(self):
+        self.copy(pattern="*", dst="include", src=os.path.join(self._source_subfolder, "include"))
+        self.copy("*LICENSE.md", dst="licenses", keep_path=False)
+
+    def package_id(self):
+        self.info.header_only()

recipes/sml/all/test_package/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.5)
+project(test_package CXX)
+
+include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
+conan_basic_setup(TARGETS)
+
+add_executable(${PROJECT_NAME} test_package.cpp)
+target_link_libraries(${PROJECT_NAME} PRIVATE CONAN_PKG::sml)
+target_compile_features(${PROJECT_NAME} PUBLIC cxx_std_14)

recipes/sml/all/test_package/conanfile.py

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+from conans import ConanFile, CMake, tools
+import os
+
+
+class TestPackageConan(ConanFile):
+    settings = "os", "compiler", "build_type", "arch"
+    generators = "cmake"
+
+    def build(self):
+        cmake = CMake(self)
+        cmake.configure()
+        cmake.build()
+
+    def test(self):
+        if not tools.cross_building(self.settings):
+            self.run(os.path.join("bin", "test_package"), run_environment=True)

recipes/sml/all/test_package/test_package.cpp

@@ -0,0 +1,95 @@
+#include <boost/sml.hpp>
+#include <cassert>
+
+namespace sml = boost::sml;
+
+namespace {
+// events
+struct release {};
+struct ack {};
+struct fin {};
+struct timeout {};
+
+// guards
+const auto is_ack_valid = [](const ack&) { return true; };
+const auto is_fin_valid = [](const fin&) { return true; };
+
+// actions
+const auto send_fin = [] {};
+const auto send_ack = [] {};
+
+#if !defined(_MSC_VER)
+struct hello_world {
+  auto operator()() const {
+    using namespace sml;
+    // clang-format off
+    return make_transition_table(
+      *"established"_s + event<release> / send_fin = "fin wait 1"_s,
+       "fin wait 1"_s + event<ack> [ is_ack_valid ] = "fin wait 2"_s,
+       "fin wait 2"_s + event<fin> [ is_fin_valid ] / send_ack = "timed wait"_s,
+       "timed wait"_s + event<timeout> / send_ack = X
+    );
+    // clang-format on
+  }
+};
+}
+
+int main() {
+  using namespace sml;
+
+  sm<hello_world> sm;
+  // static_assert(1 == sizeof(sm), "sizeof(sm) != 1b");
+  assert(sm.is("established"_s));
+
+  sm.process_event(release{});
+  assert(sm.is("fin wait 1"_s));
+
+  sm.process_event(ack{});
+  assert(sm.is("fin wait 2"_s));
+
+  sm.process_event(fin{});
+  assert(sm.is("timed wait"_s));
+
+  sm.process_event(timeout{});
+  assert(sm.is(X));  // released
+}
+#else
+class established;
+class fin_wait_1;
+class fin_wait_2;
+class timed_wait;
+
+struct hello_world {
+  auto operator()() const {
+    using namespace sml;
+    // clang-format off
+    return make_transition_table(
+      *state<established> + event<release> / send_fin = state<fin_wait_1>,
+       state<fin_wait_1> + event<ack> [ is_ack_valid ] = state<fin_wait_2>,
+       state<fin_wait_2> + event<fin> [ is_fin_valid ] / send_ack = state<timed_wait>,
+       state<timed_wait> + event<timeout> / send_ack = X
+    );
+    // clang-format on
+  }
+};
+}
+
+int main() {
+  using namespace sml;
+
+  sm<hello_world> sm;
+  assert(sm.is(state<established>));
+
+  sm.process_event(release{});
+  assert(sm.is(state<fin_wait_1>));
+
+  sm.process_event(ack{});
+  assert(sm.is(state<fin_wait_2>));
+
+  sm.process_event(fin{});
+  assert(sm.is(state<timed_wait>));
+
+  sm.process_event(timeout{});
+  assert(sm.is(X));  // released
+}
+#endif

recipes/sml/config.yml

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+versions:
+  "1.1.4":
+    folder: all