fix: add missing epoll_context::task aliasing

Author: Cra3z

README.md

@@ -35,7 +35,7 @@ A C++ **asynchronous I/O** library based on [sender/receiver model](https://wg21
 
 ### Build Options
 - `COIO_BUILD_EXAMPLES` (`ON`/`OFF`, default `OFF`) - Build example programs
-- `COIO_BUILD_TESTS` (`ON/OFF`, default `OFF`) - Build **doctest**-based tests
+- `COIO_BUILD_TESTS` (`ON/OFF`, default `OFF`) - Build [**doctest**](https://github.com/doctest/doctest)-based tests
 - `COIO_BUILD_WITH_ASAN` (`ON`/`OFF`, default `OFF`) - Whether to enable **AddressSanitizer**
 - `COIO_BUILD_WITH_TSAN` (`ON`/`OFF`, default `OFF`) - Whether to enable **ThreadSanitizer**
 - `COIO_BUILD_WITH_UBSAN` (`ON`/`OFF`, default `OFF`) - Whether to enable **UndefinedBehaviorSanitizer**

include/coio/asyncio/epoll_context.h

@@ -182,9 +182,6 @@ namespace coio {
                 Sexpr sexpr;
             };
 
-            template<typename T = void, typename Alloc = void>
-            using task = coio::task<T, Alloc, scheduler>;
-
         public:
             using scheduler_base::scheduler_base;
 
@@ -203,6 +200,9 @@ namespace coio {
             friend auto operator== (const scheduler& lhs, const scheduler& rhs) -> bool = default;
         };
 
+        template<typename T = void, typename Alloc = void>
+        using task = coio::task<T, Alloc, scheduler>;
+
     private:
         explicit epoll_context(std::nullptr_t, std::pmr::memory_resource& memory_resource) noexcept :
             loop_base(memory_resource), epoll_fd_(-1) {}