codeblocks-ep/help/html/programmerHelp/cppreference.com/cppmap/begin.html at master · maifeeulasad/codeblocks-ep · GitHub

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    <a href="../index-2.html">cppreference.com</a> &gt; <a href=
    "index.html">C++ Maps</a> &gt; <a href="begin.html">begin</a>
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  <div class="name-format">
    begin
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  <div class="syntax-name-format">
    Syntax:
  </div>
  <pre class="syntax-box">
  #include &lt;map&gt;
  iterator begin();
  const_iterator begin() const;
</pre>

  <p>The function begin() returns an iterator to the first element of
  the map. begin() should run in <a href="../complexity.html">constant
  time</a>.</p>

  <p>For example, the following code uses begin() to initialize an
  iterator that is used to traverse a list:</p>
<pre class="prettyprint">
  map&lt;string,int&gt; stringCounts;
  string str;

  while( cin &gt;&gt; str ) stringCounts[str]++;

  map&lt;string,int&gt;::iterator iter;
  for( iter = stringCounts.begin(); iter != stringCounts.end(); iter++ ) {
    cout &lt;&lt; "word: " &lt;&lt; iter-&gt;first &lt;&lt; ", count: " &lt;&lt; iter-&gt;second &lt;&lt; endl;
  }
</pre>

  <p>When given this input:</p>
<pre class="prettyprint">
  here are some words and here are some more words
</pre>

  <p>...the above code generates this output:</p>
<pre class="prettyprint">
  word: and, count: 1
  word: are, count: 2
  word: here, count: 2
  word: more, count: 1
  word: some, count: 2
  word: words, count: 2
</pre>

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    Related topics:
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    <a href="end.html">end</a><br>
    <a href="rbegin.html">rbegin</a><br>
    <a href="rend.html">rend</a>
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