TCPP2 Copying vectors

Section 10.3 Copying vectors

There is one more constructor for vectors, which is called a copy constructor because it takes one vector as an argument and creates a new vector that is the same size, with the same elements.

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vector<int> countCopy(count);

Although this syntax is legal, it is almost never used for vectors because there is a better alternative:

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vector<int> countCopy = count;

The = operator works on vectors in pretty much the way you would expect.

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Listing 10.3.1. Take a look at this active code, which uses the copy constructor.

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Checkpoint 10.3.1.

Multiple Response How would you make a copy of vector<double> decimals called nums ?

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vector<double> nums = decimals;
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This is one way to make a copy.
vector<double> decimals = nums;
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This makes a copy of nums called decimals.
vector<double> nums (decimals);
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This is one way to make a copy.
vector<double> decimals (nums);
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This makes a copy of nums called decimals.

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Checkpoint 10.3.2.

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You have attempted 1 of 4 activities on this page.

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