Friday, August 20, 2010

Vector at() Function

If you have a vector v; v.at(10) will do range checking, while v[10] will not.

Reference: The C++ Standard Library by Nicolai M. Josuttis. Addison-Wesley, 1999, p. 152.
Posted by C++ Trivia at 8:55 AM

2 comments:

  1. SaurabhSeptember 1, 2010 at 7:40 AM

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  2. SaurabhSeptember 1, 2010 at 7:42 AM

    Vector’s at function is used to get an element at particular index. It’s means that must be filled before to get. In literal meaning, at is representing as rvalue.
    While vector v[10] can be used as both means lvalue as well as rvalue.
    Vector v;
    For (int I = 0; I < 15; i++)
    {
    V[i] = i;
    }
    If v[i] will do range checking then you will be unable to assign data with subscript operator.
    Hence, there is no range check for subscript operator.

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