Boost.Signals 的有序插槽示例 - C/C++

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本文介绍了 Boost.Signals 在 C/C++ 中如何实现有序插槽的功能,通过一个“Hello, World!”示例展示了如何创建、连接和执行有序插槽,以及如何控制插槽的执行顺序。" 107497739,9269750,JavaScript ES5新特性与商品查询实战,"['javascript', '前端开发', '数据操作']

Boost.Signals 的有序插槽示例 - C/C++

Boost.Signals 是 Boost 库中的一个组件,用于实现信号和槽机制。它提供了一种简单而灵活的方式来实现事件的发布和订阅模式。本文将介绍 Boost.Signals 的有序插槽功能,并提供一个简单的 “Hello, World!” 示例。

首先,确保已经安装了 Boost 库。然后,我们可以开始编写示例代码。

#include <boost/signals2.hpp>
#include <iostream>

// 定义信号类型
typedef boost::signals2
又出现了这个问题 ../lib/tevent/tevent_signal.c: In function 'tevent_num_signals': ../lib/tevent/tevent_signal.c:42:9: error: 'TEVENT_NUM_SIGNALS' undeclared (first use in this function) 42 | return TEVENT_NUM_SIGNALS; | ^~~~~~~~~~~~~~~~~~ ../lib/tevent/tevent_signal.c:42:9: note: each undeclared identifier is reported only once for each function it appears in ../lib/tevent/tevent_signal.c: At top level: ../lib/tevent/tevent_signal.c:74:49: error: 'TEVENT_NUM_SIGNALS' undeclared here (not in a function) 74 | struct tevent_common_signal_list *sig_handlers[TEVENT_NUM_SIGNALS+1]; | ^~~~~~~~~~~~~~~~~~ The following command failed: arm-buildroot-linux-gnueabi-gcc -I../lib/zlib -DMAX_DEBUG_LEVEL=-1 -D__location__=\ -ffunction-sections -fdata-sections -I. -I/data/red-round3/red-round3/Iplatform/openwrt/build_dir/target-arm-openwrt-linux-uclibc-be220v1/samba-3.6.25/source3 -I/data/red-round3/red-round3/Iplatform/openwrt/build_dir/target-arm-openwrt-linux-uclibc-be220v1/samba-3.6.25/source3/../lib/popt -I/data/red-round3/red-round3/Iplatform/openwrt/build_dir/target-arm-openwrt-linux-uclibc-be220v1/samba-3.6.25/source3/../lib/iniparser/src -Iinclude -I./include -I. -I. -I./../lib/replace -I./librpc -I./.. -I./../lib/talloc -I./../lib/tevent -I../lib/tdb/include -DHAVE_CONFIG_H -I/data/red-round3/red-round3/Iplatform/openwrt/staging_dir/target-arm-openwrt-linux-uclibc-be220v1/usr/include -I/data/red-round3/red-round3/Iplatform/openwrt/staging_dir/target-arm-openwrt-linux-uclibc-be220v1/include -I/data/red-round3/red-round3/Iplatform/openwrt/staging_dir/usr-be220v1/include -I/data/red-round3/red-round3/Iplatform/openwrt/../../bcm504L04/toolchain/opt/toolchains/crosstools-arm_softfp-gcc-10.3-linux-4.19-glibc-2.32-binutils-2.36.1/usr/include -Iinclude -I./include -I. -I. -I./../lib/replace -I./librpc -I./.. -I./../lib/popt -I/usr/local/include -I/data/red-round3/red-round3/Iplatform/openwrt/build_dir/target-arm-openwrt-linux-uclibc-be220v1/samba-3.6.25/source3/lib -I.. -D_SAMBA_BUILD_=3 -D_SAMBA_BUILD_=3 -c ../lib/tevent/tevent_signal.c -o ../lib/tevent/tevent_signal.o Makefile:1675: recipe for target '../lib/tevent/tevent_signal.o' failed make[4]: *** [../lib/tevent/tevent_signal.o] Error 1 make[4]: Leaving directory '/data/red-round3/red-round3/Iplatform/openwrt/build_dir/target-arm-openwrt-linux-uclibc-be220v1/samba-3.6.25/source3' Makefile:221: recipe for target '/data/red-round3/red-round3/Iplatform/openwrt/build_dir/target-arm-openwrt-linux-uclibc-be220v1/samba-3.6.25/.built' failed make[3]: *** [/data/red-round3/red-round3/Iplatform/openwrt/build_dir/target-arm-openwrt-linux-uclibc-be220v1/samba-3.6.25/.built] Error 2 make[3]: Leaving directory '/data/red-round3/red-round3/Iplatform/packages/opensource/samba' package/Makefile:133: recipe for target 'package/feeds/iplatform/samba/compile' failed make[2]: *** [package/feeds/iplatform/samba/compile] Error 2 make[2]: Leaving directory '/data/red-round3/red-round3/Iplatform/openwrt' /data/red-round3/red-round3/Iplatform/openwrt/include/toplevel.mk:184: recipe for target 'package/samba/compile' failed make[1]: *** [package/samba/compile] Error 2 make[1]: Leaving directory '/data/red-round3/red-round3/Iplatform/openwrt' Makefile:234: recipe for target 'iplatform_package/samba/compile' failed make: *** [iplatform_package/samba/compile] Error 2
11-02
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