:++、::++:-++:++++:::++编译访问的附加C++::.当对象状态变化时信号被发送,?classM:publicQobject{public:M();intvalue()const{returnva;}publicslot:voidsetValue(int);signals:voidvalueChanged(int);private:intva;};::setValue(intv){if(v!=va){va=v;emitvalueChanged(v);}}则对于如下语句Ma,b;connect(&a,SIGNAL(valueChanged(int)),&b,SLOT(setValue(int)));(11);(12);();执行后,值为::.:.forName()()():,:#define,但可展开##++:publicQobject{Q_OBJECTpublicslots:voidapply(void(*apply)(List*,void*),char*);}:
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