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    <p>You could create a special iterator that acted as a iterator over an array of the corresponding elements to the vector you are sorting by. You will have to create your own reference type as is the case in std::vector. You are going to want to make sure you get move semantics (assuming you are using a modern compiler) right as this will require a whole array of items to be moved and you really don't want that to mean a copy IMO. Assignment for this reference type would iterate over a row of the different vectors, assigning the corresponding value from the other reference's row to the new one.</p> <pre><code>class my_refrence_type { private: //special refrence to know which vector you are sorting by std::vector&lt;double&gt;&amp; ref_vec; //refrence so you can get an iterator from the map to preform assignment std::unordered_map&lt;std::string,std::vector&lt;double&gt;&gt;&amp; map; //a location in the vectors. this is the row number int loc; public: /* insert constructors here and other blah blah blah*/ my_refrence_type&amp; operator=(my_refrence_type&amp;&amp; x) { for(auto&amp; vec : map) { vec.second[loc] = std::move(vec.second[x.loc]); } } //a method to get the reference vector's value so you can create a comparison function double&amp; get_ref_value() { return ref_vec[loc]; } }; </code></pre> <p>So to recap, you need a special reference type that can treat a row across vectors as a single object and an iterator type over these rows. If you get that right sorting should work with plain old std::sort. It will also give you an interesting view over the vectors that might come in handy elsewhere.</p>
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    1. POSorting vectors into an unordered_map c++11
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