通过其索引标记描述boost multi_index迭代器类型

Question

Using boost multi-index, I happen to have the following type for the iterator: 使用boost多索引，我碰巧具有以下类型的迭代器：

multi_index_set::nth_index<2>::type::iterator

I'd like go get rid of the nth_index<2> part of the type and refer to it via its index tag: 我想摆脱该类型的nth_index<2>部分，并通过其index标记进行引用：

multi_index_set::tag_index<price_index>::type::iterator //tag_index is the functionality i'd like to have

Does this exist? 是否存在？

Answer 1

如果price_index是标记，则可以像这样引用相关的索引迭代器：

multi_index_set::index<price_index>::type::iterator