C++11 new feature lambda expression

C++11 adds a feature called lambda expression that can be used to add anonymous functions

Syntax: [Capture_block] (parameter) mutable exception_specification->return_type{body}

E.g An example of a click time

Auto btntest =-Addtoucheventlistener ([=] (REF * sender, Widget::toucheventtype type) {    / /todo    });

The return type void represented by the above example is omitted

[=] Captures all variables by value (all variables are obtained by means of the method);

[&] captures all variables by reference;

Here's a simple example.

function<intvoid> Testlambda (int  x) {    return [=] ()  int {return x * x;};} // because the return type and empty argument list of an expression in lambda can be omitted:function<intvoid> Testlambda (int  x) {    return [=]{return x * x;};}

Personal Summary: Lambda can be used to add a method that is called only once, as in JavaScript.

C++11 new feature lambda expression