[]（int * p）{delete p;}是什么意思？

Question

Could someone help me to understand what

[](int* p){delete p;}

means?

I found it in the docs. for shared_ptr http://www.cplusplus.com/reference/memory/shared_ptr/shared_ptr/

Answer 1

It's a capture-less lambda expression that takes a pointer to an int and calls delete on it. Here's another MSDN link that explains the grammar of lambdas.

Answer 2

This denotes a C++11-style lambda expression ("lambda function"). It takes a pointer to an integer and delete s it.

Answer 3

it is similar to

void foo(int* p){
   delete p;
}

but can be written inline as part of another function (for example to be passed as a callback).