drop boost/signals

CMakeLists.txt

@@ -20,7 +20,6 @@ option(BUILD_SAMPLE "Build sample Rime plugin" OFF)
 option(BUILD_TEST "Build and run tests" ON)
 option(BUILD_SEPARATE_LIBS "Build separate rime-* libraries" OFF)
 option(ENABLE_LOGGING "Enable logging with google-glog library" ON)
-option(BOOST_USE_SIGNALS2 "Boost use signals2 instead of signals" ON)
 option(ENABLE_ASAN "Enable Address Sanitizer (Unix Only)" OFF)
 option(INSTALL_PRIVATE_HEADERS "Install private headers (usually needed for externally built Rime plugins)" OFF)
 option(ENABLE_EXTERNAL_PLUGINS "Enable loading of externally built Rime plugins (from directory set by RIME_PLUGINS_DIR variable)" OFF)
@@ -61,12 +60,6 @@ endif()
 
 set(BOOST_COMPONENTS regex)
 
-if(BOOST_USE_SIGNALS2)
-  set(RIME_BOOST_SIGNALS2 1)
-else()
-  set(BOOST_COMPONENTS ${BOOST_COMPONENTS} signals)
-endif()
-
 find_package(Boost 1.74.0 REQUIRED COMPONENTS ${BOOST_COMPONENTS})
 if(Boost_FOUND)
   include_directories(${Boost_INCLUDE_DIRS})

README.md

@@ -38,8 +38,8 @@ Follow the instructions to build librime on platforms other than Linux:
 
 Build dependencies
 ---
-  - compiler with C++14 support
-  - cmake>=3.10
+  - compiler with C++17 support
+  - cmake>=3.12
   - libboost>=1.74
   - libglog (optional)
   - libleveldb
@@ -81,6 +81,7 @@ Community:
   - [Trime](https://github.com/osfans/trime): frontend for Android
   - [XIME](https://github.com/stackia/XIME): frontend for macOS
   - [My RIME](https://github.com/LibreService/my_rime): frontend for web
+  - [fcitx5-android](https://github.com/fcitx5-android/fcitx5-android): frontend for Android
 
 Plugins
 ===

src/rime/build_config.h.in

@@ -5,7 +5,6 @@
 #ifndef RIME_BUILD_CONFIG_H_
 #define RIME_BUILD_CONFIG_H_
 
-#cmakedefine RIME_BOOST_SIGNALS2
 #cmakedefine RIME_ENABLE_LOGGING
 
 #cmakedefine RIME_DATA_DIR "@RIME_DATA_DIR@"

src/rime/common.h

@@ -22,12 +22,8 @@
 #include <vector>
 #include <boost/optional.hpp>
 #define BOOST_BIND_NO_PLACEHOLDERS
-#ifdef RIME_BOOST_SIGNALS2
 #include <boost/signals2/connection.hpp>
 #include <boost/signals2/signal.hpp>
-#else
-#include <boost/signals.hpp>
-#endif
 
 #ifdef RIME_ENABLE_LOGGING
 #define GLOG_NO_ABBREVIATED_SEVERITIES
@@ -83,13 +79,8 @@ inline an<T> New(Args&&... args) {
   return std::make_shared<T>(std::forward<Args>(args)...);
 }
 
-#ifdef RIME_BOOST_SIGNALS2
 using boost::signals2::connection;
 using boost::signals2::signal;
-#else
-using boost::signal;
-using boost::signals::connection;
-#endif
 
 }  // namespace rime