tmp/tmp2vhfml3g/{from.md → to.md}
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## Deprecated iterator primitives <a id="depr.iterator.primitives">[[depr.iterator.primitives]]</a>
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### Basic iterator <a id="depr.iterator.basic">[[depr.iterator.basic]]</a>
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The header `<iterator>` has the following addition:
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``` cpp
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namespace std {
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template<class Category, class T, class Distance = ptrdiff_t,
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class Pointer = T*, class Reference = T&>
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struct iterator {
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using iterator_category = Category;
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using value_type = T;
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using difference_type = Distance;
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using pointer = Pointer;
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using reference = Reference;
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};
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}
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```
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The `iterator` template may be used as a base class to ease the
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definition of required types for new iterators.
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[*Note 1*: If the new iterator type is a class template, then these
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aliases will not be visible from within the iterator class’s template
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definition, but only to callers of that class. — *end note*]
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[*Example 1*:
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If a C++program wants to define a bidirectional iterator for some data
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structure containing `double` and such that it works on a large memory
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model of the implementation, it can do so with:
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``` cpp
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class MyIterator :
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public iterator<bidirectional_iterator_tag, double, long, T*, T&> {
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// code implementing ++, etc.
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};
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```
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— *end example*]
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