function object

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Since C++11, the standard uses the term function object for every object that can be used as a function call. 下面所列均可称为function object:

1. function pointers
2. objects of classes with operator ()
3. objects of classes with a conversion to a point to function
4. lambdas

C++中的function object比起普通的函数来说，有三个优点，请问是哪三个？ #

1.Function objects are “functions with state.” 2.Each function object has its own type. 3.Function objects are usually faster than ordinary functions.

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