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POusing STL Container upper_bound & lower_bound for map
 

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  1. POusing STL Container upper_bound & lower_bound for map
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    <p>I have the following for a set</p> <pre><code>set&lt;int&gt; myset; set&lt;int&gt;::iterator it,itlow,itup; for (int i=1; i&lt;10; i++) myset.insert(i*10); // 10 20 30 40 50 60 70 80 90 itup=myset.upper_bound (50); // cout &lt;&lt; "upper_bound at position " &lt;&lt; (*itup) &lt;&lt; endl; //output: 60 </code></pre> <p>How do i do this for a map? i think the program below seem to be using the first value of the map instead of the second value hence i am getting errors.</p> <p><strong>How do i set it to use the second value?</strong></p> <pre><code>map&lt;int,int&gt; myset; map&lt;int,int&gt;::iterator it,itlow,itup; for (int i=1; i&lt;10; i++) myset.insert(i*10); // 10 20 30 40 50 60 70 80 90 itup=myset.upper_bound (50); // cout &lt;&lt; "upper_bound at position " &lt;&lt; (*itup).second &lt;&lt; endl; //output: some random value returns </code></pre> <p>Actual Code that gives me wrong values when using with map, works when i use set : </p> <pre><code>int x = 50; map&lt;int,int&gt; myset; //for (int i=1; i&lt;10; i++) myset.insert(i*10); // 10 20 30 40 50 60 70 80 90 myset[0] = 10; myset[2] = 20; myset[3] = 30; myset[4] = 40; myset[5] = 50; myset[6] = 60; myset[7] = 70; map&lt;int,int&gt;::iterator begin,upbound,lobound,it; map&lt;int,int&gt;::reverse_iterator end; end = myset.rbegin(); begin = myset.begin(); upbound=myset.upper_bound(x); lobound=myset.lower_bound(x); lobound--; if(myset.size()==1) { cout &lt;&lt; "upper_range = " &lt;&lt; x &lt;&lt;endl; cout &lt;&lt; "lower_range = " &lt;&lt; x &lt;&lt;endl; } else if(x == (*begin).second) { cout &lt;&lt; "upper_range = " &lt;&lt; (*upbound).second &lt;&lt;endl; cout &lt;&lt; "lower_range = " &lt;&lt; end-&gt;second &lt;&lt;endl; } else if(x == end-&gt;second) { cout &lt;&lt; "upper_range = " &lt;&lt; (*begin).second &lt;&lt;endl; cout &lt;&lt; "lower_range = " &lt;&lt; (*lobound).second &lt;&lt;endl; } else { cout &lt;&lt; "start = " &lt;&lt; (*begin).second &lt;&lt;endl; cout &lt;&lt; "end = " &lt;&lt; end-&gt;second&lt;&lt;endl; cout &lt;&lt; "upper_range = " &lt;&lt; (*upbound).second &lt;&lt;endl; cout &lt;&lt; "lower_range = " &lt;&lt; (*lobound).second &lt;&lt;endl; } </code></pre>
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    1. PO
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    1. This table or related slice is empty.
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      1. POusing STL Container upper_bound & lower_bound for map
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    1. CO`map<int> myset;` not sure how this compiles, `std::map` holds a key, value pair. Please post the actual code sample.not copy pasted stuff.Post a minimalist code sample which compiles and demonstrates your problem.
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    2. COas requested, edited
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    3. COThis obviously wont work as you want it to. See the definition of [upper_bound](http://www.sgi.com/tech/stl/Map.html). It says: `Finds the first element whose key greater than k.`. Also `upper_bound` is relevant for sorted structures. It is irrelevant for values of a map which is not guaranteed to be sorted.
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