How do I create an array in C++ using new and initialize each element?

Question

Without iterating through each element, how do I create an array using new and initialize each element to a certain value?

bool* a = new bool[100000];

Using VS 2008.

Thanks!

Answer 1

In that case, the only value you can set it to is false with:

bool* a = new bool[100000]();

That said, I'm not sure why you'd think you can't use a loop. They're there for a reason. You should just use the ready-made function fill or fill_n (depending on taste).

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Note using new "raw" like that is terrible programming practice. Use a std::vector<bool>*:

std::vector<bool> v;

v.resize(100000);
std::fill(v.begin(), v.end(), true); // or false

Or:

std::vector<bool> v;

v.reserve(100000);
std::fill_n(std::back_inserter(v), 100000, true); // or false

*Of course, std::vector<bool> happens to break the proper container interface so doesn't actually store bool's. If that's a problem use a std::vector<char> instead.