This program illustrates how to shrink the capacity of a vector object, and
thereby simulate "trim" and "reset" member functions, which do not currently
exist in the vector class interface.
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First we illustrate capacity behavior when vector objects are assigned.
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For v1 we have:
Size = 5  Capacity = 7
Contents: 5 5 5 5 5
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For v2 we have:
Size = 10  Capacity = 12
Contents: 10 10 10 10 10 10 10 10 10 10
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For v3 we have:
Size = 15  Capacity = 17
Contents: 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15
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Now we perform v1 = v2 and v3 = v2 and then redisplay both v1 and v3.
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For v1 we have:
Size = 10  Capacity = 10
Contents: 10 10 10 10 10 10 10 10 10 10
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For v3 we have:
Size = 10  Capacity = 17
Contents: 10 10 10 10 10 10 10 10 10 10
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Next we illustrate capacity behavior when vector objects are copied.
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So ... we create v4 as a copy of v3.
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For v4 we have:
Size = 10  Capacity = 10
Contents: 10 10 10 10 10 10 10 10 10 10
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Now we show how to "trim" the capacity of a vector down to match its size.
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For v5 we have:
Size = 5  Capacity = 10
Contents: 5 5 5 5 5
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Now we use the "self-swapping" idom vector<int>(v5).swap(v5)
to "trim" the capacity of v5.
After this, we have for v5:
Size = 5  Capacity = 5
Contents: 5 5 5 5 5
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Finally we show how to "reset" a vector so that both
its size and its capacity are reduced to zero.
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For v6 we have:
Size = 5  Capacity = 10
Contents: 5 5 5 5 5
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Now we use "swapping-with-an-empty-temporary" idom vector<int>().swap(v6)
to "reset" v6 to an empty vector of capacity zero.
After this, we have for v6:
Size = 0  Capacity = 0
Contents:
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