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Remembering the c ++ state
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Remembering the c ++ state
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My application has me calling a bunch of callbacks that need to know their last state, or the state of the last invocation. A simple instance is the time difference between two successive invocations.
I know that function objects in c++ are a generic way to do that. But I am a nOOb and not sure how to set this schema up. Any help or specific simple code examples will be much appreciated.
Just make a class that implements operator(). For instance,
class F {
int state;
public:
int operator()(/*any parameters would go here*/){
return state++;
}
F() : state(0) {}
};
You can then create and instance which will be callable and retain state.
F f;
f(); //returns 0
f(); //returns 1
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