Question

What is the difference between std::vector::at and std::vector::operator[]?

Cosmo · Accepted Answer

std::vector::at, unlike std::vector::operator[], checks if the borders of the vector are exceeded, in that case an out_of_range exception is thrown.

Cosmo · Accepted Answer

std::vector::at in some cases can throw an exception.

Cosmo · Answer

std::vector::at always returns an object by value.

Cosmo · Answer

std::vector::operator[] has a constant and non-constant implementation, while std::vector::at has only non-constant but works faster.

Cosmo · Answer

std::vector::at returns an iterator of the current element.

Cosmo · Answer

std::vector::at returns a pointer to the current element.

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