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    <p>The problem – call of <code>std::map::insert</code> member function with invalid parameters: there are two integer values provided; but there <strong>must be</strong> <code>std::pair&lt;int, int&gt;</code>. Please see the reference: <a href="http://en.cppreference.com/w/cpp/container/map/insert" rel="nofollow">std::map::insert</a>.</p> <h1>Preferable option</h1> <p>For <strong>convenience</strong> (just <strong>not to repeat</strong> the map type parameters), create a <code>typedef</code> for the map:</p> <pre><code>typedef std::map&lt;int, int&gt; IntMap; </code></pre> <p>The <code>std::map</code> has type definition for <code>std::pair</code> (pair representation) – <code>std::map::value_type</code>. So, for example, if there is a <code>std::map&lt;int, int&gt;</code> the <code>std::map::value_type</code> would be <code>std::pair&lt;int, int&gt;</code>.</p> <p>Use the <code>std::map::value_type</code> constructor (<code>IntMap::value_type</code> in this case):</p> <pre><code>class Row { public: void Row::addNumber(int num, int pos) { m_numMap.insert(IntMap::value_type(num, pos)); } private: typedef std::map&lt;int, int&gt; IntMap; IntMap m_numMap; }; </code></pre> <h1>Alternatives:</h1> <ol> <li><p>Use <code>std::make_pair()</code> function:</p> <pre><code>#include &lt;utility&gt; ... void Row::addNumber(int num, int pos) { numMap.insert(std::make_pair(num, pos)); } </code></pre></li> <li><p>Directly use <code>std::pair</code> constructor:</p> <pre><code>void Row::addNumber(int num, int pos) { numMap.insert(std::pair&lt;int, int&gt;(num, pos)); } </code></pre></li> </ol>
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    1. POHow to sort C++ map keys with std::greater?
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    1. USSergey Brunov
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    1. COVery much this. The insert function doesn't work the way you might expect it to. :(
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    2. COAh thanks, I had assumed C++'s map insert functioned the same way as Java's map.put - clearly I should have researched that more :-(
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    3. CO@Exupery, by the way, if you have used `HashMap` class in Java, you might want to use `std::unordered_map` class (available since **C++11**) – hash-map container.
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