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streamline error handling approaches

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This commit is contained in:
Christos Stratopoulos 2019-12-10 14:45:10 -05:00
parent fb7074cc87
commit f09fe50998
1 changed files with 23 additions and 34 deletions
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57
include/continuable/detail/support/asio.hpp
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@ -30,23 +30,23 @@
#ifndef CONTINUABLE_DETAIL_ASIO_HPP_INCLUDED
#define CONTINUABLE_DETAIL_ASIO_HPP_INCLUDED
#include <continuable/detail/core/base.hpp>
#include <continuable/detail/features.hpp>
#if defined(ASIO_STANDALONE)
#include <asio/async_result.hpp>
#include <asio/error_code.hpp>
#include <asio/version.hpp>
#if defined(CONTINUABLE_HAS_EXCEPTIONS)
#include <asio/system_error.hpp>
#endif
#if (ASIO_VERSION / 100 % 1000) <= 12
#define CTI_DETAIL_ASIO_HAS_NO_INTEGRATION
#elif (ASIO_VERSION / 100 % 1000) <= 14
#define CTI_DETAIL_ASIO_HAS_EXPLICIT_RET_TYPE_INTEGRATION
#endif
#if defined(CONTINUABLE_HAS_EXCEPTIONS)
#include <asio/system_error.hpp>
#endif
#define CTI_DETAIL_ASIO_NAMESPACE_BEGIN namespace asio {
#define CTI_DETAIL_ASIO_NAMESPACE_END }
#else
@ -54,16 +54,16 @@
#include <boost/system/error_code.hpp>
#include <boost/version.hpp>
#if defined(CONTINUABLE_HAS_EXCEPTIONS)
#include <boost/system/system_error.hpp>
#endif
#if (BOOST_VERSION / 100 % 1000) <= 69
#define CTI_DETAIL_ASIO_HAS_NO_INTEGRATION
#elif (BOOST_VERSION / 100 % 1000) <= 71
#define CTI_DETAIL_ASIO_HAS_EXPLICIT_RET_TYPE_INTEGRATION
#endif
#if defined(CONTINUABLE_HAS_EXCEPTIONS)
#include <boost/system/system_error.hpp>
#endif
#define CTI_DETAIL_ASIO_NAMESPACE_BEGIN \
namespace boost { \
namespace asio {
@ -79,48 +79,32 @@
"integrated manually with `cti::promisify`."
#endif
#include <continuable/detail/core/base.hpp>
#include <utility>
#if defined(CONTINUABLE_HAS_EXCEPTIONS)
#include <exception>
#endif
namespace cti {
namespace detail {
namespace asio {
#if defined(ASIO_STANDALONE)
using error_code_t = ::asio::error_code;
using error_cond_t = std::error_condition;
#if defined(CONTINUABLE_HAS_EXCEPTIONS)
using exception_t = ::asio::system_error;
using system_error_t = ::asio::system_error;
#endif
#else
using error_code_t = ::boost::system::error_code;
using error_cond_t = ::boost::system::error_condition;
#if defined(CONTINUABLE_HAS_EXCEPTIONS)
using exception_t = ::boost::system::system_error;
using system_error_t = ::boost::system::system_error;
#endif
#endif
#if defined(CONTINUABLE_HAS_EXCEPTIONS)
template <typename Promise>
void promise_exception_helper(Promise& promise, error_code_t e) noexcept {
promise.set_exception(std::make_exception_ptr(exception_t(std::move(e))));
}
#else
template <typename Promise>
void promise_exception_helper(Promise& promise, error_code_t e) noexcept
->decltype(promise.set_exception(std::move(e))) {
return promise.set_exception(std::move(e));
}
template <typename Promise>
void promise_exception_helper(Promise& promise, error_code_t e) noexcept
->decltype(promise.set_exception(error_cond_t(e.value(), e.category()))) {
promise.set_exception(error_cond_t(e.value(), e.category()));
}
#endif
// Binds `promise` to the first argument of a continuable resolver, giving it
// the signature of an ASIO handler.
template <typename Promise>
@ -128,7 +112,12 @@ auto promise_resolver_handler(Promise&& promise) noexcept {
return [promise = std::forward<Promise>(promise)](
error_code_t e, auto&&... args) mutable noexcept {
if (e) {
promise_exception_helper(promise, std::move(e));
#if defined(CONTINUABLE_HAS_EXCEPTIONS)
promise.set_exception(
std::make_exception_ptr(system_error_t(std::move(e))));
#else
promise.set_exception(cti::exception_t(e.value(), e.category()));
#endif
} else {
promise.set_value(std::forward<decltype(args)>(args)...);
}