Effective STL 27 convert a container's con_iterators to iterators

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本文介绍如何使用distance和advance函数将容器的const_iterator转换为iterator，并计算两个迭代器之间的距离。

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use distance and advance to convert a container’s const_iterators to iterators.
both of which are declared in <iterator>

typedef deque<int> IntDeque;
typedef IntDeque::iterator Iter;
typedef IntDeque::const_iterator ConstIter;
IntDeque d;
ConstIter ci;
...
Iter i(d.begin());

// figure the distance between i and ci (as const_iterators),
// then move i that distance
advance(i, distance<ConstIter>(i, ci));