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Wladimir J. van der Laan 661eaec773 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
2022-04-16 10:47:00 -06:00
..
check-doc.py Merge #15257: Scripts and tools: Bump flake8 to 3.7.8 2021-10-05 20:34:01 +03:00
check-rpc-mappings.py Merge #15257: Scripts and tools: Bump flake8 to 3.7.8 2021-10-05 20:34:01 +03:00
commit-script-check.sh Merge bitcoin/bitcoin#23543: test: Prevent non-compatible sed binary for scripted-diffs 2022-04-11 09:46:40 -07:00
extended-lint-all.sh Merge #14505: test: Add linter to make sure single parameter constructors are marked explicit 2021-11-24 14:36:20 -05:00
extended-lint-cppcheck.sh Merge #14505: test: Add linter to make sure single parameter constructors are marked explicit 2021-11-24 14:36:20 -05:00
git-subtree-check.sh Merge #17329: linter: Strip trailing / in path for git-subtree-check 2021-07-13 20:43:16 -05:00
lint-all.sh Optimize linters (#4637) 2021-12-30 19:34:36 +03:00
lint-assertions.sh merge bitcoin#17318: replace asserts in RPC code with CHECK_NONFATAL and add linter 2022-03-12 19:17:25 +05:30
lint-circular-dependencies.sh feat: implement quorum rotation and updated LLMQ parameters (#4752) 2022-04-16 17:46:04 +03:00
lint-cppcheck-dash.sh feat: implement quorum rotation and updated LLMQ parameters (#4752) 2022-04-16 17:46:04 +03:00
lint-filenames.sh merge bitcoin#17009: Add EvalScript(...) fuzzing harness 2022-02-26 10:45:13 +05:30
lint-format-strings.py merge bitcoin#16362: Add bilingual_str type 2022-04-06 00:08:01 +05:30
lint-format-strings.sh merge bitcoin#18009: Add fuzzing harness for strprintf(…) 2022-03-24 09:27:25 +05:30
lint-git-commit-check.sh Fix lint-git-commit-check.sh (#4267) 2021-07-19 12:32:12 +03:00
lint-include-guards.sh merge bitcoin#17009: Add EvalScript(...) fuzzing harness 2022-02-26 10:45:13 +05:30
lint-includes.sh Merge #19256: gui: change combiner for signals to optional_last_value 2022-04-16 10:47:00 -06:00
lint-locale-dependence.sh Merge #18649: tests: Add std::locale::global to list of locale dependent functions in lint-locale-dependence.sh 2022-04-03 18:09:07 -05:00
lint-logs.sh partial merge #16327: scripts and tools: Update ShellCheck linter 2021-12-03 18:13:01 +03:00
lint-python-dead-code.sh Merge #21096: Re-add dead code detection 2021-10-05 20:34:00 +03:00
lint-python-utf8-encoding.sh partial merge #17398: Update leveldb to 1.22+ (#4230) 2021-07-15 15:42:55 -05:00
lint-python.sh Merge #16124: tests: Limit Python linting to files in the repo 2021-11-09 14:08:49 -05:00
lint-qt.sh Merge #13529: Use new Qt5 connect syntax 2021-08-23 12:12:31 -04:00
lint-rpc-help.sh Merge bitcoin#14726: Use RPCHelpMan for all RPCs (#4492) 2021-10-12 00:55:23 +03:00
lint-shebang.sh Merge #17691: doc: Add missed copyright headers 2022-04-02 09:19:20 +05:30
lint-shell-locale.sh Partial merge #13863: travis: move script sections to files in .travis/ subject to shellcheck 2021-07-08 13:09:43 -04:00
lint-shell.sh lint: Fix typos flagged by codespell (#4639) 2021-12-29 00:45:54 +03:00
lint-spelling.ignore-words.txt Merge #17351: doc: Fix some misspellings 2022-04-02 16:30:53 +05:30
lint-spelling.sh Merge #17351: doc: Fix some misspellings 2022-04-02 16:30:53 +05:30
lint-submodule.sh Merge #18056: ci: Check for submodules 2021-07-13 21:17:15 -05:00
lint-tests.sh Merge #13510: Scripts and tools: Obsolete #!/bin/bash shebang 2020-12-18 12:55:45 -06:00
lint-whitespace.sh Merge #15216: Scripts and tools: Replace script name with a special parameter 2021-09-13 10:31:44 -04:00
README.md partial merge #17398: Update leveldb to 1.22+ (#4230) 2021-07-15 15:42:55 -05:00

README.md

This folder contains lint scripts.

check-doc.py

Check for missing documentation of command line options.

commit-script-check.sh

Verification of scripted diffs.

git-subtree-check.sh

Run this script from the root of the repository to verify that a subtree matches the contents of the commit it claims to have been updated to.

To use, make sure that you have fetched the upstream repository branch in which the subtree is maintained:

Usage: git-subtree-check.sh DIR (COMMIT)

COMMIT may be omitted, in which case HEAD is used.

lint-all.sh

Calls other scripts with the lint- prefix.