是否有一个可以重载的groovy逻辑非运算符（如unaryNot ..）(is there a groovy logical not operator (like unaryNot..) that can be overloaded)

 我在groovy中有一个Rule类，我可以重载<<，和，或者对于类实例，但如果我想写 
 
Rule a = new Rule()
a<< {false }  //overloaded evaluate internal closure 

println !a // expect to get true - but you always get false
 
 我无法找到groovy逻辑'not'运算符是什么。 如果我打电话给'！a'我总是假的，因为我认为编译器正在使用'a'的常设真理是'真'所以'！''将是假的。 
 
 但是我想要'！a'来表示这个类的'！（a.evaluate（））' 
 
 我怎么做 ？ 
 
 PS - 扩展 - 这里是我的规则类的虚拟模拟视图 - 删除了所有修剪 - 这可以在脚本中运行 
 
class Rule {
    Closure  evaluate
    def leftShift (closure ) {
        this.evaluate = closure
    }


}

def r = new Rule ()
r << {false}

println "logical not of rule : " + !r
println " rule evaluate  : " + !r.evaluate ()

r << {true}
println "logical not of rule : " + !r
println " rule evaluate  : " + !r.evaluate ()

I have a Rule class in groovy and i can overload <<, and, or for class instance but if i want to write 
 
Rule a = new Rule()
a<< {false }  //overloaded evaluate internal closure 

println !a // expect to get true - but you always get false
 
i cant find what the groovy logical 'not' operator is. If i call '!a' i always get false as i think that compiler is using groovy truth of 'a' is 'true' so '!a' would be false.
 
but i want the '!a' to mean '!(a.evaluate())' for this class 
 
how do i do that ?
 
PS - extended - here is dummy mocked up view of my Rule class - all trimmings removed - this is runnable in a script 
 
class Rule {
    Closure  evaluate
    def leftShift (closure ) {
        this.evaluate = closure
    }


}

def r = new Rule ()
r << {false}

println "logical not of rule : " + !r
println " rule evaluate  : " + !r.evaluate ()

r << {true}
println "logical not of rule : " + !r
println " rule evaluate  : " + !r.evaluate ()

原文：https://stackoverflow.com/questions/35719869