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POOverloaded << operator for a map
 

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  1. POOverloaded << operator for a map
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    <p>I am getting a very strange error even when the &lt;&lt; operator is overloaded for the below map, Feature.h is used by a class named Session.C and I am trying to print the values of the map tKeyboard using &lt;&lt;. I am new to all this and this being a very old code I am baffled about the issue, can you folks suggest some thing. Appreciate it thanks.</p> <p>Feature.h</p> <pre><code>class Feature { .. public: typedef map&lt;string,KeyStroke,std::less&lt;string&gt;,std::allocator&lt;std::pair&lt;const string, KeyStroke&gt; &gt; &gt; tKeyboard; // It is a map of keys // key is the name of the keystroke typedef tKeyboard::const_iterator cKeysIter; typedef tKeyboard::iterator KeysIter; .. private: friend ostream &amp;operator&lt;&lt;(ostream &amp;os,const tKeyboard &amp;); .. }; </code></pre> <p>Feature.C</p> <pre><code>ostream &amp;operator&lt;&lt;(ostream &amp;os,const Feature::tKeyboard &amp;k) { os &lt;&lt;" Keyboard &gt;\n"; for (Feature::cKeysIter i=k.begin() ; i!= k.end() ; i++) { os &lt;&lt; "key name:"&lt;&lt;(*i).first &lt;&lt; " ="&lt;&lt; (*i).second ; } return os; } </code></pre> <p>Session.C</p> <pre><code> if (keyStrokeVal.empty()){ Traced(3)&lt;&lt;"sendKey:Error, key "&lt;&lt;keyname&lt;&lt;" not defined or empty\n"; Traced(7)&lt;&lt;"Printing Feature "&lt;&lt;mCurrentFeature-&gt;get_mName() &lt;&lt;" 's keyboard \n" &lt;&lt; mCurrentFeature-&gt;get_mKeyboard(); Traced(7)&lt;&lt;"\n"; return(-1); } </code></pre> <p>Error:</p> <pre><code>Session.C:541: error: no match for âoperator&lt;&lt;â in âstd::operator&lt;&lt; [with _Traits = std::char_traits&lt;char&gt;](((std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;&amp;)((std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;*)std::operator&lt;&lt; [with _CharT = char, _Traits = std::char_traits&lt;char&gt;, _Alloc = std::allocator&lt;char&gt;](((std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;&amp;)((std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;*)std::operator&lt;&lt; [with _Traits = std::char_traits&lt;char&gt;](((std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;&amp;)((std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;*)((std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;*)std::operator&lt;&lt; [with _Traits = std::char_traits&lt;char&gt;](((std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;&amp;)((std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;*)((std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;*)std::operator&lt;&lt; [with _Traits = std::char_traits&lt;char&gt;](((std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;&amp;)((std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;*)std::operator&lt;&lt; [with _Traits = std::char_traits&lt;char&gt;](((std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;&amp;)((std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;*)((std::ostream*)LogMgr::traceRovr())-&gt;std::basic_ostream&lt;_CharT, _Traits&gt;::operator&lt;&lt; [with _CharT = char, _Traits = std::char_traits&lt;char&gt;](std::endl [with _CharT = char, _Traits = std::char_traits&lt;char&gt;]))), ((const char*)"Session.C")))), ((const char*)" ")))-&gt;std::basic_ostream&lt;_CharT, _Traits&gt;::operator&lt;&lt; [with _CharT = char, _Traits = std::char_traits&lt;char&gt;](541))), ((const char*)" - ")))-&gt;std::basic_ostream&lt;_CharT, _Traits&gt;::operator&lt;&lt; [with _CharT = char, _Traits = std::char_traits&lt;char&gt;](out_time))), ((const char*)"Printing Feature ")))), ((const std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt;&amp;)((const std::string*)((Session*)this)-&gt;Session::mCurrentFeature-&gt;Feature::get_mName()))))), ((const char*)" \'s keyboard \012")) &lt;&lt; ((Session*)this)-&gt;Session::mCurrentFeature-&gt;Feature::get_mKeyboard()â /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/ostream:108: note: candidates are: std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::basic_ostream&lt;_CharT, _Traits&gt;::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; (*)(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;)) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/ostream:117: note: std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::basic_ostream&lt;_CharT, _Traits&gt;::operator&lt;&lt;(std::basic_ios&lt;_CharT, _Traits&gt;&amp; (*)(std::basic_ios&lt;_CharT, _Traits&gt;&amp;)) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/ostream:127: note: std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::basic_ostream&lt;_CharT, _Traits&gt;::operator&lt;&lt;(std::ios_base&amp; (*)(std::ios_base&amp;)) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/ostream:165: note: std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::basic_ostream&lt;_CharT, _Traits&gt;::operator&lt;&lt;(long int) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/ostream:169: note: std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::basic_ostream&lt;_CharT, _Traits&gt;::operator&lt;&lt;(long unsigned int) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/ostream:173: note: std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::basic_ostream&lt;_CharT, _Traits&gt;::operator&lt;&lt;(bool) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/bits/ostream.tcc:91: note: std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::basic_ostream&lt;_CharT, _Traits&gt;::operator&lt;&lt;(short int) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/ostream:180: note: std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::basic_ostream&lt;_CharT, _Traits&gt;::operator&lt;&lt;(short unsigned int) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/bits/ostream.tcc:105: note: std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::basic_ostream&lt;_CharT, _Traits&gt;::operator&lt;&lt;(int) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/ostream:191: note: std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::basic_ostream&lt;_CharT, _Traits&gt;::operator&lt;&lt;(unsigned int) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/ostream:200: note: std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::basic_ostream&lt;_CharT, _Traits&gt;::operator&lt;&lt;(long long int) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/ostream:204: note: std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::basic_ostream&lt;_CharT, _Traits&gt;::operator&lt;&lt;(long long unsigned int) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/ostream:209: note: std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::basic_ostream&lt;_CharT, _Traits&gt;::operator&lt;&lt;(double) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/ostream:213: note: std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::basic_ostream&lt;_CharT, _Traits&gt;::operator&lt;&lt;(float) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/ostream:221: note: std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::basic_ostream&lt;_CharT, _Traits&gt;::operator&lt;&lt;(long double) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/ostream:225: note: std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::basic_ostream&lt;_CharT, _Traits&gt;::operator&lt;&lt;(const void*) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/bits/ostream.tcc:119: note: std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::basic_ostream&lt;_CharT, _Traits&gt;::operator&lt;&lt;(std::basic_streambuf&lt;_CharT, _Traits&gt;*) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] </code></pre>
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    1. COWhat is `Traced` ?
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    2. CODoes it work if you stream to `std::cout` instead of `Traced`?
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    3. COThe error is about `operator<<`, but the offending line has 4 of them. Can you isolate the problem?
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