diff options
author | Wladimir J. van der Laan <laanwj@protonmail.com> | 2020-07-01 16:02:50 +0200 |
---|---|---|
committer | Wladimir J. van der Laan <laanwj@protonmail.com> | 2020-07-01 16:12:44 +0200 |
commit | ffa70801dab7fa85c24fd5d19ca998e0910238d5 (patch) | |
tree | b9fe7e0612366be6efab5084ca513dae1ca2a91b | |
parent | 26291745aed080cb2d8576736a23869df603dec2 (diff) | |
parent | f1a0314c537791f202dfb7c1209f0e04ba7988c3 (diff) | |
download | bitcoin-ffa70801dab7fa85c24fd5d19ca998e0910238d5.tar.xz |
Merge #19256: gui: change combiner for signals to optional_last_value
f1a0314c537791f202dfb7c1209f0e04ba7988c3 gui: change combiner for signals to optional_last_value (Cory Fields)
Pull request description:
[`optional_last_value`](https://www.boost.org/doc/libs/1_73_0/doc/html/boost/signals2/optional_last_value.html), which does not throw, has replaced `last_value` as
Boosts default combiner. Besides being better supported, it also doesn't
trigger gcc's `-Wmaybe-unitialized` warning, presumably because exceptions no
longer bubble-up out of signals:
```bash
In file included from ui_interface.cpp:9:
/bitcoin/depends/x86_64-pc-linux-gnu/share/../include/boost/signals2/last_value.hpp: In member function 'boost::signals2::detail::signal_impl<R(Args ...), Combiner, Group, GroupCompare, SlotFunction, ExtendedSlotFunction, Mutex>::result_type boost::signals2::detail::signal_impl<R(Args ...), Combiner, Group, GroupCompare, SlotFunction, ExtendedSlotFunction, Mutex>::operator()(Args ...) [with Combiner = boost::signals2::last_value<bool>; Group = int; GroupCompare = std::less<int>; SlotFunction = boost::function<bool(const bilingual_str&, const std::__cxx11::basic_string<char>&, unsigned int)>; ExtendedSlotFunction = boost::function<bool(const boost::signals2::connection&, const bilingual_str&, const std::__cxx11::basic_string<char>&, unsigned int)>; Mutex = boost::signals2::mutex; R = bool; Args = {const bilingual_str&, const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, unsigned int}]':
/bitcoin/depends/x86_64-pc-linux-gnu/share/../include/boost/signals2/last_value.hpp:54:36: warning: '*((void*)& value +1)' may be used uninitialized in this function [-Wmaybe-uninitialized]
if(value) return value.get();
^
/bitcoin/depends/x86_64-pc-linux-gnu/share/../include/boost/signals2/last_value.hpp:43:21: note: '*((void*)& value +1)' was declared here
optional<T> value;
^~~~~
/bitcoin/depends/x86_64-pc-linux-gnu/share/../include/boost/signals2/last_value.hpp: In member function 'boost::signals2::detail::signal_impl<R(Args ...), Combiner, Group, GroupCompare, SlotFunction, ExtendedSlotFunction, Mutex>::result_type boost::signals2::detail::signal_impl<R(Args ...), Combiner, Group, GroupCompare, SlotFunction, ExtendedSlotFunction, Mutex>::operator()(Args ...) [with Combiner = boost::signals2::last_value<bool>; Group = int; GroupCompare = std::less<int>; SlotFunction = boost::function<bool(const bilingual_str&, const std::__cxx11::basic_string<char>&, const std::__cxx11::basic_string<char>&, unsigned int)>; ExtendedSlotFunction = boost::function<bool(const boost::signals2::connection&, const bilingual_str&, const std::__cxx11::basic_string<char>&, const std::__cxx11::basic_string<char>&, unsigned int)>; Mutex = boost::signals2::mutex; R = bool; Args = {const bilingual_str&, const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, unsigned int}]':
/bitcoin/depends/x86_64-pc-linux-gnu/share/../include/boost/signals2/last_value.hpp:54:36: warning: '*((void*)& value +1)' may be used uninitialized in this function [-Wmaybe-uninitialized]
if(value) return value.get();
^
/bitcoin/depends/x86_64-pc-linux-gnu/share/../include/boost/signals2/last_value.hpp:43:21: note: '*((void*)& value +1)' was declared here
optional<T> value;
^~~~~
```
The change in default happened in [Boost 1.39.0](https://www.boost.org/users/history/version_1_39_0.html) (along with the introduction of the Signals2 library.
More information is also available here https://www.boost.org/doc/libs/1_73_0/doc/html/signals2/rationale.html#id-1.3.36.9.4:
> The default combiner for Boost.Signals2 has changed from the last_value combiner used by default in the original Boost.Signals library.
> This is because last_value requires that at least 1 slot be connected to the signal when it is invoked (except for the last_value<void> specialization).
> In a multi-threaded environment where signal invocations and slot connections and disconnections may be happening concurrently, it is difficult to fulfill this requirement. When using optional_last_value, there is no requirement for slots to be connected when a signal is invoked, since in that case the combiner may simply return an empty boost::optional.
ACKs for top commit:
laanwj:
ACK f1a0314c537791f202dfb7c1209f0e04ba7988c3
Tree-SHA512: 3600f85019a3591b141dc9207f8a7e66d16d9996cf97fdf08f5133a212d55c591955ab835ffbdca20b5d62711578bc305d5525c75546fa957f180192e2a80c1e
-rw-r--r-- | src/node/ui_interface.cpp | 10 | ||||
-rwxr-xr-x | test/lint/lint-includes.sh | 2 |
2 files changed, 6 insertions, 6 deletions
diff --git a/src/node/ui_interface.cpp b/src/node/ui_interface.cpp index 9ccd8e27e2..8d3665975d 100644 --- a/src/node/ui_interface.cpp +++ b/src/node/ui_interface.cpp @@ -6,14 +6,14 @@ #include <util/translation.h> -#include <boost/signals2/last_value.hpp> +#include <boost/signals2/optional_last_value.hpp> #include <boost/signals2/signal.hpp> CClientUIInterface uiInterface; struct UISignals { - boost::signals2::signal<CClientUIInterface::ThreadSafeMessageBoxSig, boost::signals2::last_value<bool>> ThreadSafeMessageBox; - boost::signals2::signal<CClientUIInterface::ThreadSafeQuestionSig, boost::signals2::last_value<bool>> ThreadSafeQuestion; + boost::signals2::signal<CClientUIInterface::ThreadSafeMessageBoxSig, boost::signals2::optional_last_value<bool>> ThreadSafeMessageBox; + boost::signals2::signal<CClientUIInterface::ThreadSafeQuestionSig, boost::signals2::optional_last_value<bool>> ThreadSafeQuestion; boost::signals2::signal<CClientUIInterface::InitMessageSig> InitMessage; boost::signals2::signal<CClientUIInterface::NotifyNumConnectionsChangedSig> NotifyNumConnectionsChanged; boost::signals2::signal<CClientUIInterface::NotifyNetworkActiveChangedSig> NotifyNetworkActiveChanged; @@ -42,8 +42,8 @@ ADD_SIGNALS_IMPL_WRAPPER(NotifyBlockTip); ADD_SIGNALS_IMPL_WRAPPER(NotifyHeaderTip); ADD_SIGNALS_IMPL_WRAPPER(BannedListChanged); -bool CClientUIInterface::ThreadSafeMessageBox(const bilingual_str& message, const std::string& caption, unsigned int style) { return g_ui_signals.ThreadSafeMessageBox(message, caption, style); } -bool CClientUIInterface::ThreadSafeQuestion(const bilingual_str& message, const std::string& non_interactive_message, const std::string& caption, unsigned int style) { return g_ui_signals.ThreadSafeQuestion(message, non_interactive_message, caption, style); } +bool CClientUIInterface::ThreadSafeMessageBox(const bilingual_str& message, const std::string& caption, unsigned int style) { return g_ui_signals.ThreadSafeMessageBox(message, caption, style).value_or(false);} +bool CClientUIInterface::ThreadSafeQuestion(const bilingual_str& message, const std::string& non_interactive_message, const std::string& caption, unsigned int style) { return g_ui_signals.ThreadSafeQuestion(message, non_interactive_message, caption, style).value_or(false);} void CClientUIInterface::InitMessage(const std::string& message) { return g_ui_signals.InitMessage(message); } void CClientUIInterface::NotifyNumConnectionsChanged(int newNumConnections) { return g_ui_signals.NotifyNumConnectionsChanged(newNumConnections); } void CClientUIInterface::NotifyNetworkActiveChanged(bool networkActive) { return g_ui_signals.NotifyNetworkActiveChanged(networkActive); } diff --git a/test/lint/lint-includes.sh b/test/lint/lint-includes.sh index 5404565b94..611bd4a8c4 100755 --- a/test/lint/lint-includes.sh +++ b/test/lint/lint-includes.sh @@ -64,7 +64,7 @@ EXPECTED_BOOST_INCLUDES=( boost/preprocessor/cat.hpp boost/preprocessor/stringize.hpp boost/signals2/connection.hpp - boost/signals2/last_value.hpp + boost/signals2/optional_last_value.hpp boost/signals2/signal.hpp boost/test/unit_test.hpp boost/thread/condition_variable.hpp |