Anonymous object is a relatively fragmentary knowledge point , Although not the focus of the investigation , But I still think it’s necessary to mention .

Look at a piece of code ：

new ClassName().Function();

In the code above , Create a new object directly , And called the Function function , But there is no reference to this object . You can probably see that , Anonymous objects are only for temporary use , And is recycled at the end of the statement . Actually in C/C++ There are similar operations in , such as for Indicator variables in the loop i：

for (int i = 0; i < length; i++) //i As a local variable , stay for It's eliminated at the end of the cycle
{
cout << i << endl;
}

An anonymous class The usage scenarios are as follows ：

• Method requires an object of a class as a parameter , And the object has no other use ;
• The function of this object is just to call one of the methods at a time , There is no other use .