[chord] what is wrap

[zkfzle]

Very sorry to trouble you.
In the process of reading code, I met with the function wrap.I looked it up in some books.However, I haven't found its meaning.What does this word mean?
For example,in the line:
dhash->retrieve(ID, wrap(&gotindirect_cb, (BLOCKSIZE/sha1::hashsize)*(i*BLOCKSIZE/20)));
Yours, Zhou Kun
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