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strange syntax in stl (gnu version)

I saw something really wierld in g++ version of stl source.

void construct(pointer __p, const _Tp& __val) { ::new(__p)
_Tp(__val); }

anybody knows about the syntax new(__p) means? can new really take a
pointer as a parameter?

Sep 19 '07 #1
1 1402
Ningyu Shi wrote:
I saw something really wierld in g++ version of stl source.

void construct(pointer __p, const _Tp& __val) { ::new(__p)
_Tp(__val); }

anybody knows about the syntax new(__p) means? can new really take a
pointer as a parameter?
Look up placement new.

--
Ian Collins.
Sep 19 '07 #2

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