Hi, everyone!

My STL tutorial said,

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A raw_storage_iterator enables algorithms to
store results into uninitialized memory.
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But I do not know what means uninitialized memory.
Who can give me an explanation of what means
uninitialized memory? Here are two examples given
by the tutorial. Please give me the explanation through
the following examples.

Example 1:

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vector<int> a (2, 5);
vector<int> b (2, 7);
int *c = allocate((ptrdiff_t) a.size(), (int*)0 );

transform (a.begin(), a.end(), b.begin(),
raw_storage_iterator<int*, int> (c), plus<int>() );

copy (&c[0], &c[2], ostream_iterator<int> (cout, " ") );

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Example 2:
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template <class T1, class T2>
inline void construct(T1* p, const T2& value) {
new (p) T1(value);
}

int a[10] = {1, 2, 3, 4, 5};
copy (&a[0], &a[5], raw_storage_iterator<int*, int> (&a[5]) );
--------


Thanks in advance,
George