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downloads/boost_1_34_1/libs/mpl/doc/src/refmanual/Sequences-Intrinsic.rst
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The metafunctions that form the essential interface of sequence `classes`__ documented in the corresponding |sequence concepts| are known as intrinsic sequence operations. They differ from generic |sequence algorithms| in that, in general, they need to be implemented from scratch for each new sequence class [1].
It's worth noting that STL counterparts of these metafunctions are usually implemented as member functions.
| [1] | In practice, many of intrinsic metafunctions offer a default implementation that will work in majority of cases, given that you've implemented the core functionality they rely on (such as |begin| / |end|). |
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