Initial work on corooutine/await support

CMakeLists.txt

@@ -10,6 +10,7 @@ if (NOT DEFINED CONTINUABLE_UNIT_TESTS
   set(CONTINUABLE_UNIT_TESTS ON)
 endif()
 
+include(cmake/CMakeLists.txt)
 add_subdirectory(dep)
 
 # continuable-base
@@ -23,7 +24,8 @@ target_include_directories(continuable-base
 
 target_link_libraries(continuable-base
   INTERFACE
-    Threads::Threads)
+    Threads::Threads
+    continuable-coroutines)
 
 target_compile_features(continuable-base
   INTERFACE
@@ -50,7 +52,7 @@ target_link_libraries(continuable
     function2)
 
 # Create an install target
-install(TARGETS continuable-base continuable
+install(TARGETS continuable-coroutines continuable-base continuable
         EXPORT continuable-config
         INCLUDES DESTINATION include)
 
@@ -92,8 +94,6 @@ if (CONTINUABLE_UNIT_TESTS)
 
   enable_testing()
 
-  include(cmake/CMakeLists.txt)
-
   add_subdirectory(doc)
   add_subdirectory(examples)
   add_subdirectory(test)

cmake/CMakeLists.txt

@@ -1,5 +1,6 @@
 add_library(continuable-features-flags INTERFACE)
 add_library(continuable-features-warnings INTERFACE)
 add_library(continuable-features-noexcept INTERFACE)
+add_library(continuable-coroutines INTERFACE)
 
 include(cmake/configure_compiler.cmake)

cmake/compiler/clang.cmake

@@ -5,6 +5,16 @@ target_compile_options(continuable-features-warnings
     -pedantic
     -Wextra)
 
+if (WITH_COROUTINES)
+  target_compile_options(continuable-coroutines
+    INTERFACE
+      -fcoroutines-ts)
+
+  target_compile_definitions(continuable-coroutines
+    INTERFACE
+      -DCONTINUABLE_HAS_EXPERIMENTAL_COROUTINE)
+endif()
+
 if (TESTS_NO_EXCEPTIONS)
   target_compile_options(continuable-features-noexcept
     INTERFACE
@@ -12,4 +22,3 @@ if (TESTS_NO_EXCEPTIONS)
 
   message(STATUS "Clang: Disabled exceptions")
 endif()
-

cmake/compiler/msvc.cmake

@@ -19,6 +19,16 @@ target_compile_options(continuable-features-warnings
   INTERFACE
     /W4)
 
+if (WITH_COROUTINES)
+  target_compile_options(continuable-coroutines
+    INTERFACE
+      /await)
+
+  target_compile_definitions(continuable-coroutines
+    INTERFACE
+      -DCONTINUABLE_HAS_EXPERIMENTAL_COROUTINE)
+endif()
+
 if (TESTS_NO_EXCEPTIONS)
   target_compile_definitions(continuable-features-noexcept
     INTERFACE

include/continuable/continuable-base.hpp

@@ -503,6 +503,22 @@ public:
     return std::move(*this);
   }
 
+#ifdef CONTINUABLE_HAS_EXPERIMENTAL_COROUTINE
+  bool is_ready() const noexcept {
+    return false;
+  }
+
+  void await_suspend(detail::types::coroutine_handle<> h) && {
+
+    h.resume();
+  }
+
+  auto await_resume() {
+    // if ec throw
+    // return n;
+  }
+#endif // CONTINUABLE_HAS_EXPERIMENTAL_COROUTINE
+
 private:
   void release() noexcept {
     ownership_.release();

include/continuable/detail/features.hpp

@@ -52,4 +52,7 @@
 /// TODO Enable this
 #undef CONTINUABLE_HAS_CXX17_FOLD_EXPRESSION
 
+/// This is enabled by the CMake project
+// #undef CONTINUABLE_HAS_EXPERIMENTAL_COROUTINE
+
 #endif // CONTINUABLE_DETAIL_FEATURES_HPP_INCLUDED__

include/continuable/detail/types.hpp

@@ -39,6 +39,10 @@
 #endif // CONTINUABLE_WITH_NO_EXCEPTIONS
 #endif // CONTINUABLE_WITH_CUSTOM_ERROR_TYPE
 
+#ifdef CONTINUABLE_HAS_EXPERIMENTAL_COROUTINE
+#include <experimental/coroutine>
+#endif // CONTINUABLE_HAS_EXPERIMENTAL_COROUTINE
+
 #include <continuable/continuable-api.hpp>
 #include <continuable/detail/features.hpp>
 
@@ -62,6 +66,10 @@ using error_type = std::error_condition;
 struct this_thread_executor_tag {};
 /// A tag which is used to continue with an error
 struct dispatch_error_tag {};
+
+#ifdef CONTINUABLE_HAS_EXPERIMENTAL_COROUTINE
+using std::experimental::coroutine_handle;
+#endif // CONTINUABLE_HAS_EXPERIMENTAL_COROUTINE
 } // namespace types
 } // namespace detail
 } // namespace cti