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ControlDenied

delete method

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I have seen in C++ FAQ Lite the following way to delete a multidimensional array allocated with new
for (unsigned i = nrows; i > 0; --i)
    delete[] matrix[i-1];
delete[] matrix; 


Why not
for (unsigned i = 0; i < nrows; ++i)
    delete[] matrix;
delete[] matrix; 


? I have always used the second way, never had a problem except once that throwed an unhandled exception. With the first way it did not. Does anybody knows why? Also, why --i or ++i instead of i-- or i++?

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Both methods should work, the only difference is that you count up, the other code counts down.

It is good practice to use preincrement/decrement instead of postin/decrement. It doesn't matter when you use integers, but when you are incrementing iterators ++i will be faster then i++ because i++ has to create a copy.

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Guest Anonymous Poster
Quote:
Original post by ControlDeniedAlso, why --i or ++i instead of i-- or i++?


incidently C++ FAQ LITE explains that as well

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