Added suspend_invoke and tags::on_resume

Author: codeinred

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.0.0)
-project(conduit VERSION 0.1.2 LANGUAGES CXX)
+project(conduit VERSION 0.2.0 LANGUAGES CXX)
 
 option(CONDUIT_Install "Install CMake targets during install step." ON)
 

README.md

@@ -74,7 +74,7 @@ rm -rf conduit
 
 On Ubuntu, installation would be as follows:
 
-1. Download [conduit.deb](https://github.com/functionalperez/conduit/releases/download/v0.1.2/conduit_0.1.2-0_all.deb) (This is a download link)
+1. Download [conduit.deb](https://github.com/functionalperez/conduit/releases/download/v0.2.0/conduit_0.2.0-0_all.deb) (This is a download link)
 2. Go to your downloads folder (`cd ~/Downloads`)
 3. Run `sudo apt install ./conduit.deb` (or just double-click the file to open it in the installer)
 

VERSION

@@ -1 +1 @@
-0.1.2
+0.2.0

include/conduit/async/suspend_invoke.hpp

@@ -0,0 +1,42 @@
+#pragma once
+#include <conduit/mixin/resumable.hpp>
+#include <conduit/util/concepts.hpp>
+#include <conduit/util/tag_types.hpp>
+
+namespace conduit {
+// clang-format off
+template <class Func>
+concept on_suspend_callback = requires(Func func, std::coroutine_handle<> h) {
+    { func(h) } -> same_as<void>;
+};
+
+template <class Func>
+concept on_resume_callback = requires(Func func) {
+    { func(tags::on_resume) };
+};
+// clang-format on
+} // namespace conduit
+
+namespace conduit::async {
+template <class Func>
+struct suspend_invoke_container {
+    [[no_unique_address]] Func on_suspend;
+};
+
+template <class Func>
+struct suspend_invoke : suspend_invoke_container<Func>,
+                        mixin::Resumable<suspend_invoke<Func>> {
+    using suspend_invoke_container<Func>::on_suspend;
+    using mixin::Resumable<suspend_invoke<Func>>::await_resume;
+    decltype(auto) await_resume() {
+        if constexpr (conduit::on_resume_callback<decltype(on_suspend)>) {
+            return on_suspend(tags::on_resume);
+        } else {
+            return;
+        }
+    }
+};
+
+template <on_suspend_callback Func>
+suspend_invoke(Func) -> suspend_invoke<Func>;
+} // namespace conduit::async

include/conduit/util/tag_types.hpp

@@ -2,6 +2,11 @@
 #include <conduit/util/concepts.hpp>
 
 namespace conduit::tags {
+struct on_resume_t {
+    explicit on_resume_t() = default;
+};
+constexpr auto on_resume = on_resume_t();
+
 struct get_promise_t {
     explicit get_promise_t() = default;
 };
@@ -30,4 +35,4 @@ struct nothing_t {
 };
 constexpr auto nothing = nothing_t();
 
-} // namespace conduit
+} // namespace conduit::tags

main.cpp

@@ -6,6 +6,7 @@
 #include <conduit/source.hpp>
 #include <conduit/task.hpp>
 #include <conduit/async/destroy.hpp>
+#include <conduit/async/suspend_invoke.hpp>
 #include <cstdio>
 #include <cstdlib>
 #include <iostream>
@@ -72,7 +73,6 @@ future<std::string> test_generator(std::string on_success) {
     co_return std::string(begin(g), end(g));
 }
 
-
 future<std::string> test_on_suspend(std::string on_success) {
     std::string result;
     auto f = [](std::coroutine_handle<> h, std::string& result, std::string& on_success) {
@@ -112,6 +112,15 @@ future<std::string> test_source(std::string on_success) {
     co_return result;
 }
 
+future<std::string> test_suspend_invoke(std::string on_success) {
+    std::string result;
+    co_await async::suspend_invoke{[&](std::coroutine_handle<> h) {
+        result = on_success;
+        h.resume();
+    }};
+    co_return result;
+}
+
 future<std::string> test_task(std::string on_success) {
     auto coro = [&](std::string& s) -> task {
         s = on_success;
@@ -133,6 +142,7 @@ coroutine run_tests() {
     RUN_TEST(test_on_suspend);
     RUN_TEST(test_recursive_generator);
     RUN_TEST(test_source);
+    RUN_TEST(test_suspend_invoke);
     RUN_TEST(test_task);
 }