coffee/continuable
1
0
Fork 0
mirror of https://github.com/Naios/continuable.git synced 2025-12-06 08:46:44 +08:00
Code Issues Packages Projects Releases Wiki Activity

Add cti::promisify with an initial boost asio helper

Browse Source
This commit is contained in:
Denis Blank 2018-02-26 05:04:38 +01:00
parent 9c66b53f23
commit 786792f4f0
6 changed files with 189 additions and 52 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
examples/example-asio/example-asio.cpp
View File

@ -59,29 +59,12 @@ struct functional_io_service : asio::io_service {
});
}
template <typename Protocol>
auto async_resolve(Protocol&& protocol, std::string host,
std::string service) {
using asio::ip::udp;
return cti::make_continuable<udp::resolver::iterator>([
this, protocol = std::forward<Protocol>(protocol), host = std::move(host),
service = std::move(service)
](auto&& promise) mutable {
resolver_.async_resolve(
host, service,
[promise = std::forward<decltype(promise)>(promise)](
std::error_code const& error,
udp::resolver::iterator iterator) mutable {
if (error) {
promise.set_exception(
std::error_condition(error.value(), error.category()));
} else {
promise.set_value(std::move(iterator));
}
});
});
auto async_resolve(std::string host, std::string service) {
return cti::promisify<asio::ip::udp::resolver::iterator>::from_asio(
[&](auto&&... args) {
resolver_.async_resolve(std::forward<decltype(args)>(args)...);
},
std::move(host), std::move(service));
}
};
@ -90,7 +73,7 @@ int main(int, char**) {
functional_io_service service;
service.async_resolve(udp::v4(), "127.0.0.1", "daytime")
service.async_resolve("127.0.0.1", "daytime")
.then([](udp::resolver::iterator iterator) {
// ...
return *iterator;

83
include/continuable/continuable-promisify.hpp Normal file
View File

@ -0,0 +1,83 @@
/*
/~` _ _ _|_. _ _ |_ | _
\_,(_)| | | || ||_|(_||_)|(/_
https://github.com/Naios/continuable
v3.0.0
Copyright(c) 2015 - 2018 Denis Blank <denis.blank at outlook dot com>
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.
**/
#ifndef CONTINUABLE_PROMISIFY_HPP_INCLUDED
#define CONTINUABLE_PROMISIFY_HPP_INCLUDED
#include <type_traits>
#include <utility>
#include <continuable/detail/promisify.hpp>
namespace cti {
/// Helper class for converting callback taking callable types into a
/// a continuable. Various styles are supported.
/// - `from_asio`: Converts callback taking callable types into continuables
/// which pass an error code as first parameter and the rest of
/// the result afterwards.
///
/// \tparam Result The result of the converted continuable, this should align
/// with the arguments that are passed to the callback.
template <typename... Result>
class promisify {
using helper = detail::convert::promisify_helper<Result...>;
public:
/// Converts callback taking callable types into a continuable.
/// This applies to calls which pass an error code as first parameter
/// and the rest of the asynchronous result afterwards.
///
/// See an example of how to promisify boost asio's async_resolve below:
/// ```cpp
/// auto async_resolve(std::string host, std::string service) {
/// return cti::promisify<asio::ip::udp::resolver::iterator>::from_asio(
/// [&](auto&&... args) {
/// resolver_.async_resolve(std::forward<decltype(args)>(args)...);
/// },
/// std::move(host), std::move(service));
/// }
/// ```
///
/// If the error code which is passed as first parameter is set there are
/// two behaviours depending whether exceptions are enabled:
/// - If exceptions are enabled the error type is passed via
/// an exception_ptr to the failure handler.
/// - If exceptions are disabled the error type is copnverted to an
/// `std::error_conditon` and passed down to the error handler.
///
template <typename Callable, typename... Args>
static auto from_asio(Callable&& callable, Args&&... args) {
return helper::template from<detail::convert::promisify_asio>(
std::forward<Callable>(callable), std::forward<Args>(args)...);
}
};
} // namespace cti
#endif // CONTINUABLE_PROMISIFY_HPP_INCLUDED

1
include/continuable/continuable.hpp
View File

@ -48,6 +48,7 @@ namespace cti {}
#include <continuable/continuable-base.hpp>
#include <continuable/continuable-compositions.hpp>
#include <continuable/continuable-promise-base.hpp>
#include <continuable/continuable-promisify.hpp>
#include <continuable/continuable-trait.hpp>
#include <continuable/continuable-transforms.hpp>
#include <continuable/continuable-traverse-async.hpp>

95
include/continuable/detail/promisify.hpp Normal file
View File

@ -0,0 +1,95 @@
/*
/~` _ _ _|_. _ _ |_ | _
\_,(_)| | | || ||_|(_||_)|(/_
https://github.com/Naios/continuable
v3.0.0
Copyright(c) 2015 - 2018 Denis Blank <denis.blank at outlook dot com>
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.
**/
#ifndef CONTINUABLE_DETAIL_PROMISIFY_HPP_INCLUDED
#define CONTINUABLE_DETAIL_PROMISIFY_HPP_INCLUDED
#include <type_traits>
#if defined(CONTINUABLE_HAS_EXCEPTIONS)
#include <exception>
#endif // CONTINUABLE_HAS_EXCEPTIONS
#include <continuable/continuable-base.hpp>
#include <continuable/detail/traits.hpp>
#include <continuable/detail/util.hpp>
namespace cti {
namespace detail {
namespace convert {
/// A helper class for promisifying asio style callback taking functions
/// into a continuable.
template <typename P>
struct promisify_asio {
P promise;
template <typename E, typename... T>
void operator()(E&& error, T&&... result) {
if (error) {
#if defined(CONTINUABLE_HAS_EXCEPTIONS)
promise.set_exception(std::make_exception_ptr(std::forward<E>(error)));
#else
promise.set_exception(
std::error_condition(error.value(), error.category()));
#endif // CONTINUABLE_HAS_EXCEPTIONS
} else {
promise.set_value(std::forward<T>(result)...);
}
}
};
template <typename... Result>
struct promisify_helper {
template <template <class T> class Evaluator, typename Callable,
typename... Args>
static auto from(Callable&& callable, Args&&... args) {
return make_continuable<Result...>([args = std::make_tuple(
std::forward<Callable>(callable),
std::forward<Args>(args)...)](
auto&& promise) mutable {
traits::unpack(
std::move(args), [promise = std::forward<decltype(promise)>(promise)](
auto&&... args) mutable {
Evaluator<std::decay_t<decltype(promise)>> evaluator{
std::move(promise)};
util::invoke(std::forward<decltype(args)>(args)...,
std::move(evaluator));
});
});
}
};
} // namespace convert
} // namespace detail
} // namespace cti
#endif // CONTINUABLE_DETAIL_PROMISIFY_HPP_INCLUDED

2
test/playground/CMakeLists.txt
View File

@ -5,6 +5,7 @@ set(LIB_SOURCES
${CMAKE_SOURCE_DIR}/include/continuable/continuable-compositions.hpp
${CMAKE_SOURCE_DIR}/include/continuable/continuable-trait.hpp
${CMAKE_SOURCE_DIR}/include/continuable/continuable-promise-base.hpp
${CMAKE_SOURCE_DIR}/include/continuable/continuable-promisify.hpp
${CMAKE_SOURCE_DIR}/include/continuable/continuable-transforms.hpp
${CMAKE_SOURCE_DIR}/include/continuable/continuable-traverse.hpp
${CMAKE_SOURCE_DIR}/include/continuable/continuable-traverse-async.hpp
@ -15,6 +16,7 @@ set(LIB_SOURCES_DETAIL
${CMAKE_SOURCE_DIR}/include/continuable/detail/composition.hpp
${CMAKE_SOURCE_DIR}/include/continuable/detail/expected.hpp
${CMAKE_SOURCE_DIR}/include/continuable/detail/hints.hpp
${CMAKE_SOURCE_DIR}/include/continuable/detail/promisify.hpp
${CMAKE_SOURCE_DIR}/include/continuable/detail/container-category.hpp
${CMAKE_SOURCE_DIR}/include/continuable/detail/traverse.hpp
${CMAKE_SOURCE_DIR}/include/continuable/detail/traverse-async.hpp

29
test/playground/comp.cpp
View File

@ -253,34 +253,7 @@ struct future_result {
} // namespace detail
} // namespace cti
using namespace cti::detail;
using namespace remapping;
template <typename... Result>
struct promisify {
template <typename Callable, typename... Args>
static auto from(Callable&& callable, Args&&... args) {
return cti::make_continuable<Result...>([args = std::make_tuple(
std::forward<Callable>(
callable),
std::forward<Args>(args)...)](
auto&& promise) mutable {
traits::unpack(std::move(args), [promise =
std::forward<decltype(promise)>(
promise)](
auto&&... args) mutable {
util::invoke(
std::forward<decltype(args)>(args)..., [promise =
std::move(promise)](
auto&&... /*result*/){
});
});
});
}
};
using namespace cti::detail::remapping;
int main(int, char**) {