本项目为 CLIPS 规则引擎应用的 demo，演示了如何将 CLIPS 规则引擎嵌入到 C++ 项目中。
CLIPS 的学习和使用可以参考这篇文章：CLIPS 规则引擎介绍与使用
使用示例：
✗ ./bin/build.sh
✗ ./dist/clips-project
clips code check syntax and load successfully!
==> f-3 (phase "exe_rule")
==> Activation -100 phase-transfer: f-3,f-1
==> f-4 (var1 1)
==> Activation 0 R1: f-3,f-4
FIRE 1 R1: f-3,f-4
==> f-5 (hit (k testrule1) (v 1))
FIRE 2 phase-transfer: f-3,f-1
<== f-3 (phase "exe_rule")
==> f-6 (phase result)
==> Activation 0 RES_result: f-6,*,f-2
FIRE 3 RES_result: f-6,*,f-2
==> f-7 (DISABLE_RES_RESULT)
<== f-2 (clips_result (hits nil))
==> f-8 (clips_result (hits <Fact-5>))
<== Focus MAIN
3 rules fired
6 mean number of facts (7 maximum).
1 mean number of instances (1 maximum).
1 mean number of activations (2 maximum).
DFN >> get-clips-result ED:1 ()
DFN << get-clips-result ED:1 ()
clips result:{"hits":[{"k":"testrule1","v":1}]}
执行结果的最后一行是从规则引擎中获取到的规则执行结果，中间的输出是开启了 watch all 功能，而打印出的执行过程。