What's the meaning of 'Chunk * _chunk = new (size) Chunk(size)'?

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There is a c++ code shown below:

Chunk * _chunk = new (size) Chunk(size);

I don't understand the first '(size)' following the 'new',What's the meaning of it? The code above is from JDK8.

asked 1 min ago

yangyixiaof

30

What's the meaning of 'Chunk * _chunk = new (size) Chunk(size)'?